all messages for Emacs-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
blob c232b08bd1a131d61884b7e19ecfe3f773af5edc 111387 bytes (raw)
name: lisp/emacs-lisp/ert.el 	 # note: path name is non-authoritative(*)

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
 
;;; ert.el --- Emacs Lisp Regression Testing  -*- lexical-binding: t -*-

;; Copyright (C) 2007-2008, 2010-2017 Free Software Foundation, Inc.

;; Author: Christian Ohler <ohler@gnu.org>
;; Keywords: lisp, tools

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; ERT is a tool for automated testing in Emacs Lisp.  Its main
;; features are facilities for defining and running test cases and
;; reporting the results as well as for debugging test failures
;; interactively.
;;
;; The main entry points are `ert-deftest', which is similar to
;; `defun' but defines a test, and `ert-run-tests-interactively',
;; which runs tests and offers an interactive interface for inspecting
;; results and debugging.  There is also
;; `ert-run-tests-batch-and-exit' for non-interactive use.
;;
;; The body of `ert-deftest' forms resembles a function body, but the
;; additional operators `should', `should-not', `should-error' and
;; `skip-unless' are available.  `should' is similar to cl's `assert',
;; but signals a different error when its condition is violated that
;; is caught and processed by ERT.  In addition, it analyzes its
;; argument form and records information that helps debugging
;; (`assert' tries to do something similar when its second argument
;; SHOW-ARGS is true, but `should' is more sophisticated).  For
;; information on `should-not' and `should-error', see their
;; docstrings.  `skip-unless' skips the test immediately without
;; processing further, this is useful for checking the test
;; environment (like availability of features, external binaries, etc).
;;
;; See ERT's info manual as well as the docstrings for more details.
;; To compile the manual, run `makeinfo ert.texinfo' in the ERT
;; directory, then C-u M-x info ert.info in Emacs to view it.
;;
;; To see some examples of tests written in ERT, see its self-tests in
;; ert-tests.el.  Some of these are tricky due to the bootstrapping
;; problem of writing tests for a testing tool, others test simple
;; functions and are straightforward.

;;; Code:

(require 'cl-lib)
(require 'button)
(require 'debug)
(require 'easymenu)
(require 'ewoc)
(require 'find-func)
(require 'help)
(require 'pp)

;;; UI customization options.

(defgroup ert ()
  "ERT, the Emacs Lisp regression testing tool."
  :prefix "ert-"
  :group 'lisp)

(defface ert-test-result-expected '((((class color) (background light))
                                     :background "green1")
                                    (((class color) (background dark))
                                     :background "green3"))
  "Face used for expected results in the ERT results buffer."
  :group 'ert)

(defface ert-test-result-unexpected '((((class color) (background light))
                                       :background "red1")
                                      (((class color) (background dark))
                                       :background "red3"))
  "Face used for unexpected results in the ERT results buffer."
  :group 'ert)


;;; Copies/reimplementations of cl functions.

(defun ert-equal-including-properties (a b)
  "Return t if A and B have similar structure and contents.

This is like `equal-including-properties' except that it compares
the property values of text properties structurally (by
recursing) rather than with `eq'.  Perhaps this is what
`equal-including-properties' should do in the first place; see
Emacs bug 6581 at URL `http://debbugs.gnu.org/cgi/bugreport.cgi?bug=6581'."
  ;; This implementation is inefficient.  Rather than making it
  ;; efficient, let's hope bug 6581 gets fixed so that we can delete
  ;; it altogether.
  (not (ert--explain-equal-including-properties a b)))


;;; Defining and locating tests.

;; The data structure that represents a test case.
(cl-defstruct ert-test
  (name nil)
  (documentation nil)
  (body (cl-assert nil))
  (most-recent-result nil)
  (expected-result-type ':passed)
  (tags '()))

(defun ert-test-boundp (symbol)
  "Return non-nil if SYMBOL names a test."
  (and (get symbol 'ert--test) t))

(defun ert-get-test (symbol)
  "If SYMBOL names a test, return that.  Signal an error otherwise."
  (unless (ert-test-boundp symbol) (error "No test named `%S'" symbol))
  (get symbol 'ert--test))

(defun ert-set-test (symbol definition)
  "Make SYMBOL name the test DEFINITION, and return DEFINITION."
  (when (eq symbol 'nil)
    ;; We disallow nil since `ert-test-at-point' and related functions
    ;; want to return a test name, but also need an out-of-band value
    ;; on failure.  Nil is the most natural out-of-band value; using 0
    ;; or "" or signaling an error would be too awkward.
    ;;
    ;; Note that nil is still a valid value for the `name' slot in
    ;; ert-test objects.  It designates an anonymous test.
    (error "Attempt to define a test named nil"))
  (define-symbol-prop symbol 'ert--test definition)
  definition)

(defun ert-make-test-unbound (symbol)
  "Make SYMBOL name no test.  Return SYMBOL."
  (cl-remprop symbol 'ert--test)
  symbol)

(defun ert--parse-keys-and-body (keys-and-body)
  "Split KEYS-AND-BODY into keyword-and-value pairs and the remaining body.

KEYS-AND-BODY should have the form of a property list, with the
exception that only keywords are permitted as keys and that the
tail -- the body -- is a list of forms that does not start with a
keyword.

Returns a two-element list containing the keys-and-values plist
and the body."
  (let ((extracted-key-accu '())
        (remaining keys-and-body))
    (while (keywordp (car-safe remaining))
      (let ((keyword (pop remaining)))
        (unless (consp remaining)
          (error "Value expected after keyword %S in %S"
                 keyword keys-and-body))
        (when (assoc keyword extracted-key-accu)
          (warn "Keyword %S appears more than once in %S" keyword
                keys-and-body))
        (push (cons keyword (pop remaining)) extracted-key-accu)))
    (setq extracted-key-accu (nreverse extracted-key-accu))
    (list (cl-loop for (key . value) in extracted-key-accu
                   collect key
                   collect value)
          remaining)))

;;;###autoload
(cl-defmacro ert-deftest (name () &body docstring-keys-and-body)
  "Define NAME (a symbol) as a test.

BODY is evaluated as a `progn' when the test is run.  It should
signal a condition on failure or just return if the test passes.

`should', `should-not', `should-error' and `skip-unless' are
useful for assertions in BODY.

Use `ert' to run tests interactively.

Tests that are expected to fail can be marked as such
using :expected-result.  See `ert-test-result-type-p' for a
description of valid values for RESULT-TYPE.

\(fn NAME () [DOCSTRING] [:expected-result RESULT-TYPE] \
[:tags \\='(TAG...)] BODY...)"
  (declare (debug (&define :name test
                           name sexp [&optional stringp]
			   [&rest keywordp sexp] def-body))
           (doc-string 3)
           (indent 2))
  (let ((documentation nil)
        (documentation-supplied-p nil))
    (when (stringp (car docstring-keys-and-body))
      (setq documentation (pop docstring-keys-and-body)
            documentation-supplied-p t))
    (cl-destructuring-bind
        ((&key (expected-result nil expected-result-supplied-p)
               (tags nil tags-supplied-p))
         body)
        (ert--parse-keys-and-body docstring-keys-and-body)
      `(cl-macrolet ((skip-unless (form) `(ert--skip-unless ,form)))
         (ert-set-test ',name
                       (make-ert-test
                        :name ',name
                        ,@(when documentation-supplied-p
                            `(:documentation ,documentation))
                        ,@(when expected-result-supplied-p
                            `(:expected-result-type ,expected-result))
                        ,@(when tags-supplied-p
                            `(:tags ,tags))
                        :body (lambda () ,@body)))
         ',name))))

;; We use these `put' forms in addition to the (declare (indent)) in
;; the defmacro form since the `declare' alone does not lead to
;; correct indentation before the .el/.elc file is loaded.
;; Autoloading these `put' forms solves this.
;;;###autoload
(progn
  ;; TODO(ohler): Figure out what these mean and make sure they are correct.
  (put 'ert-deftest 'lisp-indent-function 2)
  (put 'ert-info 'lisp-indent-function 1))

(defvar ert--find-test-regexp
  (concat "^\\s-*(ert-deftest"
          find-function-space-re
          "%s\\(\\s-\\|$\\)")
  "The regexp the `find-function' mechanisms use for finding test definitions.")


(define-error 'ert-test-failed "Test failed")
(define-error 'ert-test-skipped "Test skipped")

(defun ert-pass ()
  "Terminate the current test and mark it passed.  Does not return."
  (throw 'ert--pass nil))

(defun ert-fail (data)
  "Terminate the current test and mark it failed.  Does not return.
DATA is displayed to the user and should state the reason of the failure."
  (signal 'ert-test-failed (list data)))

(defun ert-skip (data)
  "Terminate the current test and mark it skipped.  Does not return.
DATA is displayed to the user and should state the reason for skipping."
  (signal 'ert-test-skipped (list data)))


;;; The `should' macros.

(defvar ert--should-execution-observer nil)

(defun ert--signal-should-execution (form-description)
  "Tell the current `should' form observer (if any) about FORM-DESCRIPTION."
  (when ert--should-execution-observer
    (funcall ert--should-execution-observer form-description)))

;; See Bug#24402 for why this exists
(defun ert--should-signal-hook (error-symbol data)
  "Stupid hack to stop `condition-case' from catching ert signals.
It should only be stopped when ran from inside ert--run-test-internal."
  (when (and (not (symbolp debugger))   ; only run on anonymous debugger
             (memq error-symbol '(ert-test-failed ert-test-skipped)))
    (funcall debugger 'error data)))

(defun ert--special-operator-p (thing)
  "Return non-nil if THING is a symbol naming a special operator."
  (and (symbolp thing)
       (let ((definition (indirect-function thing)))
         (and (subrp definition)
              (eql (cdr (subr-arity definition)) 'unevalled)))))

;; FIXME: Code inside of here should probably be evaluated like it is
;; outside of tests, with the sole exception of error handling
(defun ert--expand-should-1 (whole form inner-expander)
  "Helper function for the `should' macro and its variants."
  (let ((form
         ;; catch macroexpansion errors
         (condition-case err
             (macroexpand-all form
                              (append (bound-and-true-p
                                       byte-compile-macro-environment)
                                      (cond
                                       ((boundp 'macroexpand-all-environment)
                                        macroexpand-all-environment)
                                       ((boundp 'cl-macro-environment)
                                        cl-macro-environment))))
           (error `(signal ',(car err) ',(cdr err))))))
    (cond
     ((or (atom form) (ert--special-operator-p (car form)))
      (let ((value (cl-gensym "value-")))
        `(let ((,value (cl-gensym "ert-form-evaluation-aborted-")))
           ,(funcall inner-expander
                     `(setq ,value ,form)
                     `(list ',whole :form ',form :value ,value)
                     value)
           ,value)))
     (t
      (let ((fn-name (car form))
            (arg-forms (cdr form)))
        (cl-assert (or (symbolp fn-name)
                       (and (consp fn-name)
                            (eql (car fn-name) 'lambda)
                            (listp (cdr fn-name)))))
        (let ((fn (cl-gensym "fn-"))
              (args (cl-gensym "args-"))
              (value (cl-gensym "value-"))
              (default-value (cl-gensym "ert-form-evaluation-aborted-")))
          `(let* ((,fn (function ,fn-name))
                  (,args (condition-case err
                             (let ((signal-hook-function #'ert--should-signal-hook))
                               (list ,@arg-forms))
                           (error (progn (setq ,fn #'signal)
                                         (list (car err)
                                               (cdr err)))))))
             (let ((,value ',default-value))
               ,(funcall inner-expander
                         `(setq ,value (apply ,fn ,args))
                         `(nconc (list ',whole)
                                 (list :form `(,,fn ,@,args))
                                 (unless (eql ,value ',default-value)
                                   (list :value ,value))
                                 (let ((-explainer-
                                        (and (symbolp ',fn-name)
                                             (get ',fn-name 'ert-explainer))))
                                   (when -explainer-
                                     (list :explanation
                                           (apply -explainer- ,args)))))
                         value)
               ,value))))))))

(defun ert--expand-should (whole form inner-expander)
  "Helper function for the `should' macro and its variants.

Analyzes FORM and returns an expression that has the same
semantics under evaluation but records additional debugging
information.

INNER-EXPANDER should be a function and is called with two
arguments: INNER-FORM and FORM-DESCRIPTION-FORM, where INNER-FORM
is an expression equivalent to FORM, and FORM-DESCRIPTION-FORM is
an expression that returns a description of FORM.  INNER-EXPANDER
should return code that calls INNER-FORM and performs the checks
and error signaling specific to the particular variant of
`should'.  The code that INNER-EXPANDER returns must not call
FORM-DESCRIPTION-FORM before it has called INNER-FORM."
  (ert--expand-should-1
   whole form
   (lambda (inner-form form-description-form value-var)
     (let ((form-description (cl-gensym "form-description-")))
       `(let (,form-description)
          ,(funcall inner-expander
                    `(unwind-protect
                         ,inner-form
                       (setq ,form-description ,form-description-form)
                       (ert--signal-should-execution ,form-description))
                    `,form-description
                    value-var))))))

(cl-defmacro should (form)
  "Evaluate FORM.  If it returns nil, abort the current test as failed.

Returns the value of FORM."
  (declare (debug t))
  (ert--expand-should `(should ,form) form
                      (lambda (inner-form form-description-form _value-var)
                        `(unless ,inner-form
                           (ert-fail ,form-description-form)))))

(cl-defmacro should-not (form)
  "Evaluate FORM.  If it returns non-nil, abort the current test as failed.

Returns nil."
  (declare (debug t))
  (ert--expand-should `(should-not ,form) form
                      (lambda (inner-form form-description-form _value-var)
                        `(unless (not ,inner-form)
                           (ert-fail ,form-description-form)))))

(defun ert--should-error-handle-error (form-description-fn
                                       condition type exclude-subtypes)
  "Helper function for `should-error'.

Determines whether CONDITION matches TYPE and EXCLUDE-SUBTYPES,
and aborts the current test as failed if it doesn't."
  (let ((signaled-conditions (get (car condition) 'error-conditions))
        (handled-conditions (pcase-exhaustive type
                              ((pred listp) type)
                              ((pred symbolp) (list type)))))
    (cl-assert signaled-conditions)
    (unless (cl-intersection signaled-conditions handled-conditions)
      (ert-fail (append
                 (funcall form-description-fn)
                 (list
                  :condition condition
                  :fail-reason (concat "the error signaled did not"
                                       " have the expected type")))))
    (when exclude-subtypes
      (unless (member (car condition) handled-conditions)
        (ert-fail (append
                   (funcall form-description-fn)
                   (list
                    :condition condition
                    :fail-reason (concat "the error signaled was a subtype"
                                         " of the expected type"))))))))

;; FIXME: The expansion will evaluate the keyword args (if any) in
;; nonstandard order.
(cl-defmacro should-error (form &rest keys &key type exclude-subtypes)
  "Evaluate FORM and check that it signals an error.

The error signaled needs to match TYPE.  TYPE should be a list
of condition names.  (It can also be a non-nil symbol, which is
equivalent to a singleton list containing that symbol.)  If
EXCLUDE-SUBTYPES is nil, the error matches TYPE if one of its
condition names is an element of TYPE.  If EXCLUDE-SUBTYPES is
non-nil, the error matches TYPE if it is an element of TYPE.

If the error matches, returns (ERROR-SYMBOL . DATA) from the
error.  If not, or if no error was signaled, abort the test as
failed."
  (declare (debug t))
  (unless type (setq type ''error))
  (ert--expand-should
   `(should-error ,form ,@keys)
   form
   (lambda (inner-form form-description-form value-var)
     (let ((errorp (cl-gensym "errorp"))
           (form-description-fn (cl-gensym "form-description-fn-")))
       `(let ((,errorp nil)
              (,form-description-fn (lambda () ,form-description-form)))
          (condition-case -condition-
              ,inner-form
            ;; We can't use ,type here because we want to evaluate it.
            (error
             (setq ,errorp t)
             (ert--should-error-handle-error ,form-description-fn
                                             -condition-
                                             ,type ,exclude-subtypes)
             (setq ,value-var -condition-)))
          (unless ,errorp
            (ert-fail (append
                       (funcall ,form-description-fn)
                       (list
                        :fail-reason "did not signal an error")))))))))

(cl-defmacro ert--skip-unless (form)
  "Evaluate FORM.  If it returns nil, skip the current test.
Errors during evaluation are caught and handled like nil."
  (declare (debug t))
  (ert--expand-should `(skip-unless ,form) form
                      (lambda (inner-form form-description-form _value-var)
                        `(unless (ignore-errors ,inner-form)
                           (ert-skip ,form-description-form)))))


;;; Explanation of `should' failures.

;; TODO(ohler): Rework explanations so that they are displayed in a
;; similar way to `ert-info' messages; in particular, allow text
;; buttons in explanations that give more detail or open an ediff
;; buffer.  Perhaps explanations should be reported through `ert-info'
;; rather than as part of the condition.

(defun ert--proper-list-p (x)
  "Return non-nil if X is a proper list, nil otherwise."
  (cl-loop
   for firstp = t then nil
   for fast = x then (cddr fast)
   for slow = x then (cdr slow) do
   (when (null fast) (cl-return t))
   (when (not (consp fast)) (cl-return nil))
   (when (null (cdr fast)) (cl-return t))
   (when (not (consp (cdr fast))) (cl-return nil))
   (when (and (not firstp) (eq fast slow)) (cl-return nil))))

(defun ert--explain-format-atom (x)
  "Format the atom X for `ert--explain-equal'."
  (pcase x
    ((pred characterp) (list x (format "#x%x" x) (format "?%c" x)))
    ((pred integerp) (list x (format "#x%x" x)))
    (_ x)))

(defun ert--explain-equal-rec (a b)
  "Return a programmer-readable explanation of why A and B are not `equal'.
Returns nil if they are."
  (if (not (equal (type-of a) (type-of b)))
      `(different-types ,a ,b)
    (pcase-exhaustive a
      ((pred consp)
       (let ((a-proper-p (ert--proper-list-p a))
             (b-proper-p (ert--proper-list-p b)))
         (if (not (eql (not a-proper-p) (not b-proper-p)))
             `(one-list-proper-one-improper ,a ,b)
           (if a-proper-p
               (if (not (equal (length a) (length b)))
                   `(proper-lists-of-different-length ,(length a) ,(length b)
                                                      ,a ,b
                                                      first-mismatch-at
                                                      ,(cl-mismatch a b :test 'equal))
                 (cl-loop for i from 0
                          for ai in a
                          for bi in b
                          for xi = (ert--explain-equal-rec ai bi)
                          do (when xi (cl-return `(list-elt ,i ,xi)))
                          finally (cl-assert (equal a b) t)))
             (let ((car-x (ert--explain-equal-rec (car a) (car b))))
               (if car-x
                   `(car ,car-x)
                 (let ((cdr-x (ert--explain-equal-rec (cdr a) (cdr b))))
                   (if cdr-x
                       `(cdr ,cdr-x)
                     (cl-assert (equal a b) t)
                     nil))))))))
      ((pred arrayp)
       (if (not (equal (length a) (length b)))
           `(arrays-of-different-length ,(length a) ,(length b)
                                        ,a ,b
                                        ,@(unless (char-table-p a)
                                            `(first-mismatch-at
                                              ,(cl-mismatch a b :test 'equal))))
         (cl-loop for i from 0
                  for ai across a
                  for bi across b
                  for xi = (ert--explain-equal-rec ai bi)
                  do (when xi (cl-return `(array-elt ,i ,xi)))
                  finally (cl-assert (equal a b) t))))
      ((pred atom)
       (if (not (equal a b))
           (if (and (symbolp a) (symbolp b) (string= a b))
               `(different-symbols-with-the-same-name ,a ,b)
             `(different-atoms ,(ert--explain-format-atom a)
                               ,(ert--explain-format-atom b)))
         nil)))))

(defun ert--explain-equal (a b)
  "Explainer function for `equal'."
  ;; Do a quick comparison in C to avoid running our expensive
  ;; comparison when possible.
  (if (equal a b)
      nil
    (ert--explain-equal-rec a b)))
(put 'equal 'ert-explainer 'ert--explain-equal)

(defun ert--significant-plist-keys (plist)
  "Return the keys of PLIST that have non-null values, in order."
  (cl-assert (zerop (mod (length plist) 2)) t)
  (cl-loop for (key value . rest) on plist by #'cddr
           unless (or (null value) (memq key accu)) collect key into accu
           finally (cl-return accu)))

(defun ert--plist-difference-explanation (a b)
  "Return a programmer-readable explanation of why A and B are different plists.

Returns nil if they are equivalent, i.e., have the same value for
each key, where absent values are treated as nil.  The order of
key/value pairs in each list does not matter."
  (cl-assert (zerop (mod (length a) 2)) t)
  (cl-assert (zerop (mod (length b) 2)) t)
  ;; Normalizing the plists would be another way to do this but it
  ;; requires a total ordering on all lisp objects (since any object
  ;; is valid as a text property key).  Perhaps defining such an
  ;; ordering is useful in other contexts, too, but it's a lot of
  ;; work, so let's punt on it for now.
  (let* ((keys-a (ert--significant-plist-keys a))
         (keys-b (ert--significant-plist-keys b))
         (keys-in-a-not-in-b (cl-set-difference keys-a keys-b :test 'eq))
         (keys-in-b-not-in-a (cl-set-difference keys-b keys-a :test 'eq)))
    (cl-flet ((explain-with-key (key)
                (let ((value-a (plist-get a key))
                      (value-b (plist-get b key)))
                  (cl-assert (not (equal value-a value-b)) t)
                  `(different-properties-for-key
                    ,key ,(ert--explain-equal-including-properties value-a
                                                                   value-b)))))
      (cond (keys-in-a-not-in-b
             (explain-with-key (car keys-in-a-not-in-b)))
            (keys-in-b-not-in-a
             (explain-with-key (car keys-in-b-not-in-a)))
            (t
             (cl-loop for key in keys-a
                      when (not (equal (plist-get a key) (plist-get b key)))
                      return (explain-with-key key)))))))

(defun ert--abbreviate-string (s len suffixp)
  "Shorten string S to at most LEN chars.

If SUFFIXP is non-nil, returns a suffix of S, otherwise a prefix."
  (let ((n (length s)))
    (cond ((< n len)
           s)
          (suffixp
           (substring s (- n len)))
          (t
           (substring s 0 len)))))

;; TODO(ohler): Once bug 6581 is fixed, rename this to
;; `ert--explain-equal-including-properties-rec' and add a fast-path
;; wrapper like `ert--explain-equal'.
(defun ert--explain-equal-including-properties (a b)
  "Explainer function for `ert-equal-including-properties'.

Returns a programmer-readable explanation of why A and B are not
`ert-equal-including-properties', or nil if they are."
  (if (not (equal a b))
      (ert--explain-equal a b)
    (cl-assert (stringp a) t)
    (cl-assert (stringp b) t)
    (cl-assert (eql (length a) (length b)) t)
    (cl-loop for i from 0 to (length a)
             for props-a = (text-properties-at i a)
             for props-b = (text-properties-at i b)
             for difference = (ert--plist-difference-explanation
                               props-a props-b)
             do (when difference
                  (cl-return `(char ,i ,(substring-no-properties a i (1+ i))
                                    ,difference
                                    context-before
                                    ,(ert--abbreviate-string
                                      (substring-no-properties a 0 i)
                                      10 t)
                                    context-after
                                    ,(ert--abbreviate-string
                                      (substring-no-properties a (1+ i))
                                      10 nil))))
             ;; TODO(ohler): Get `equal-including-properties' fixed in
             ;; Emacs, delete `ert-equal-including-properties', and
             ;; re-enable this assertion.
             ;;finally (cl-assert (equal-including-properties a b) t)
             )))
(put 'ert-equal-including-properties
     'ert-explainer
     'ert--explain-equal-including-properties)


;;; Implementation of `ert-info'.

;; TODO(ohler): The name `info' clashes with
;; `ert--test-execution-info'.  One or both should be renamed.
(defvar ert--infos '()
  "The stack of `ert-info' infos that currently apply.

Bound dynamically.  This is a list of (PREFIX . MESSAGE) pairs.")

(cl-defmacro ert-info ((message-form &key ((:prefix prefix-form) "Info: "))
                       &body body)
  "Evaluate MESSAGE-FORM and BODY, and report the message if BODY fails.

To be used within ERT tests.  MESSAGE-FORM should evaluate to a
string that will be displayed together with the test result if
the test fails.  PREFIX-FORM should evaluate to a string as well
and is displayed in front of the value of MESSAGE-FORM."
  (declare (debug ((form &rest [sexp form]) body))
	   (indent 1))
  `(let ((ert--infos (cons (cons ,prefix-form ,message-form) ert--infos)))
     ,@body))



;;; Facilities for running a single test.

(defvar ert-debug-on-error nil
  "Non-nil means enter debugger when a test fails or terminates with an error.")

;; The data structures that represent the result of running a test.
(cl-defstruct ert-test-result
  (messages nil)
  (should-forms nil)
  )
(cl-defstruct (ert-test-passed (:include ert-test-result)))
(cl-defstruct (ert-test-result-with-condition (:include ert-test-result))
  (condition (cl-assert nil))
  (backtrace (cl-assert nil))
  (infos (cl-assert nil)))
(cl-defstruct (ert-test-quit (:include ert-test-result-with-condition)))
(cl-defstruct (ert-test-failed (:include ert-test-result-with-condition)))
(cl-defstruct (ert-test-skipped (:include ert-test-result-with-condition)))
(cl-defstruct (ert-test-aborted-with-non-local-exit
               (:include ert-test-result)))

(defun ert--print-backtrace (backtrace do-xrefs)
  "Format the backtrace BACKTRACE to the current buffer."
  (let ((print-escape-newlines t)
        (print-level 8)
        (print-length 50))
    (debugger-insert-backtrace backtrace do-xrefs)))

;; A container for the state of the execution of a single test and
;; environment data needed during its execution.
(cl-defstruct ert--test-execution-info
  (test (cl-assert nil))
  (result (cl-assert nil))
  ;; A thunk that may be called when RESULT has been set to its final
  ;; value and test execution should be terminated.  Should not
  ;; return.
  (exit-continuation (cl-assert nil))
  ;; The binding of `debugger' outside of the execution of the test.
  next-debugger
  ;; The binding of `ert-debug-on-error' that is in effect for the
  ;; execution of the current test.  We store it to avoid being
  ;; affected by any new bindings the test itself may establish.  (I
  ;; don't remember whether this feature is important.)
  ert-debug-on-error)

(defun ert--run-test-debugger (info args)
  "During a test run, `debugger' is bound to a closure that calls this function.

This function records failures and errors and either terminates
the test silently or calls the interactive debugger, as
appropriate.

INFO is the ert--test-execution-info corresponding to this test
run.  ARGS are the arguments to `debugger'."
  (cl-destructuring-bind (first-debugger-arg &rest more-debugger-args)
      args
    (cl-ecase first-debugger-arg
      ((lambda debug t exit nil)
       (apply (ert--test-execution-info-next-debugger info) args))
      (error
       (let* ((condition (car more-debugger-args))
              (type (cl-case (car condition)
                      ((quit) 'quit)
		      ((ert-test-skipped) 'skipped)
                      (otherwise 'failed)))
              ;; We store the backtrace in the result object for
              ;; `ert-results-pop-to-backtrace-for-test-at-point'.
              ;; This means we have to limit `print-level' and
              ;; `print-length' when printing result objects.  That
              ;; might not be worth while when we can also use
              ;; `ert-results-rerun-test-debugging-errors-at-point',
              ;; (i.e., when running interactively) but having the
              ;; backtrace ready for printing is important for batch
              ;; use.
              ;;
              ;; Grab the frames starting from `signal', frames below
              ;; that are all from the debugger.
              (backtrace (backtrace-frames 'signal))
              (infos (reverse ert--infos)))
         (setf (ert--test-execution-info-result info)
               (cl-ecase type
                 (quit
                  (make-ert-test-quit :condition condition
                                      :backtrace backtrace
                                      :infos infos))
                 (skipped
                  (make-ert-test-skipped :condition condition
                                        :backtrace backtrace
                                        :infos infos))
                 (failed
                  (make-ert-test-failed :condition condition
                                        :backtrace backtrace
                                        :infos infos))))
         ;; Work around Emacs's heuristic (in eval.c) for detecting
         ;; errors in the debugger.
         (cl-incf num-nonmacro-input-events)
         ;; FIXME: We should probably implement more fine-grained
         ;; control a la non-t `debug-on-error' here.
         (cond
          ((ert--test-execution-info-ert-debug-on-error info)
           (apply (ert--test-execution-info-next-debugger info) args))
          (t))
         (funcall (ert--test-execution-info-exit-continuation info)))))))

(defun ert--run-test-internal (test-execution-info)
  "Low-level function to run a test according to TEST-EXECUTION-INFO.

This mainly sets up debugger-related bindings."
  (setf (ert--test-execution-info-next-debugger test-execution-info) debugger
        (ert--test-execution-info-ert-debug-on-error test-execution-info)
        ert-debug-on-error)
  (catch 'ert--pass
    ;; For now, each test gets its own temp buffer and its own
    ;; window excursion, just to be safe.  If this turns out to be
    ;; too expensive, we can remove it.
    (with-temp-buffer
      (save-window-excursion
        ;; FIXME: Use `signal-hook-function' instead of `debugger' to
        ;; handle ert errors. Once that's done, remove
        ;; `ert--should-signal-hook'.  See Bug#24402 and Bug#11218 for
        ;; details.
        (let ((debugger (lambda (&rest args)
                          (ert--run-test-debugger test-execution-info
                                                  args)))
              (debug-on-error t)
              (debug-on-quit t)
              ;; FIXME: Do we need to store the old binding of this
              ;; and consider it in `ert--run-test-debugger'?
              (debug-ignored-errors nil)
              (ert--infos '()))
          (funcall (ert-test-body (ert--test-execution-info-test
                                   test-execution-info))))))
    (ert-pass))
  (setf (ert--test-execution-info-result test-execution-info)
        (make-ert-test-passed))
  nil)

(defun ert--force-message-log-buffer-truncation ()
  "Immediately truncate *Messages* buffer according to `message-log-max'.

This can be useful after reducing the value of `message-log-max'."
  (with-current-buffer (messages-buffer)
    ;; This is a reimplementation of this part of message_dolog() in xdisp.c:
    ;; if (NATNUMP (Vmessage_log_max))
    ;;   {
    ;;     scan_newline (Z, Z_BYTE, BEG, BEG_BYTE,
    ;;                   -XFASTINT (Vmessage_log_max) - 1, 0);
    ;;     del_range_both (BEG, BEG_BYTE, PT, PT_BYTE, 0);
    ;;   }
    (when (and (integerp message-log-max) (>= message-log-max 0))
      (let ((begin (point-min))
            (end (save-excursion
                   (goto-char (point-max))
                   (forward-line (- message-log-max))
                   (point)))
            (inhibit-read-only t))
        (delete-region begin end)))))

(defvar ert--running-tests nil
  "List of tests that are currently in execution.

This list is empty while no test is running, has one element
while a test is running, two elements while a test run from
inside a test is running, etc.  The list is in order of nesting,
innermost test first.

The elements are of type `ert-test'.")

(defun ert-run-test (ert-test)
  "Run ERT-TEST.

Returns the result and stores it in ERT-TEST's `most-recent-result' slot."
  (setf (ert-test-most-recent-result ert-test) nil)
  (cl-block error
    (let ((begin-marker
           (with-current-buffer (messages-buffer)
             (point-max-marker))))
      (unwind-protect
          (let ((info (make-ert--test-execution-info
                       :test ert-test
                       :result
                       (make-ert-test-aborted-with-non-local-exit)
                       :exit-continuation (lambda ()
                                            (cl-return-from error nil))))
                (should-form-accu (list)))
            (unwind-protect
                (let ((ert--should-execution-observer
                       (lambda (form-description)
                         (push form-description should-form-accu)))
                      (message-log-max t)
                      (ert--running-tests (cons ert-test ert--running-tests)))
                  (ert--run-test-internal info))
              (let ((result (ert--test-execution-info-result info)))
                (setf (ert-test-result-messages result)
                      (with-current-buffer (messages-buffer)
                        (buffer-substring begin-marker (point-max))))
                (ert--force-message-log-buffer-truncation)
                (setq should-form-accu (nreverse should-form-accu))
                (setf (ert-test-result-should-forms result)
                      should-form-accu)
                (setf (ert-test-most-recent-result ert-test) result))))
        (set-marker begin-marker nil))))
  (ert-test-most-recent-result ert-test))

(defun ert-running-test ()
  "Return the top-level test currently executing."
  (car (last ert--running-tests)))


;;; Test selectors.

(defun ert-test-result-type-p (result result-type)
  "Return non-nil if RESULT matches type RESULT-TYPE.

Valid result types:

nil -- Never matches.
t -- Always matches.
:failed, :passed, :skipped -- Matches corresponding results.
\(and TYPES...) -- Matches if all TYPES match.
\(or TYPES...) -- Matches if some TYPES match.
\(not TYPE) -- Matches if TYPE does not match.
\(satisfies PREDICATE) -- Matches if PREDICATE returns true when called with
                           RESULT."
  ;; It would be easy to add `member' and `eql' types etc., but I
  ;; haven't bothered yet.
  (pcase-exhaustive result-type
    ('nil nil)
    ('t t)
    (:failed (ert-test-failed-p result))
    (:passed (ert-test-passed-p result))
    (:skipped (ert-test-skipped-p result))
    (`(,operator . ,operands)
     (cl-ecase operator
       (and
        (cl-case (length operands)
          (0 t)
          (t
           (and (ert-test-result-type-p result (car operands))
                (ert-test-result-type-p result `(and ,@(cdr operands)))))))
       (or
        (cl-case (length operands)
          (0 nil)
          (t
           (or (ert-test-result-type-p result (car operands))
               (ert-test-result-type-p result `(or ,@(cdr operands)))))))
       (not
        (cl-assert (eql (length operands) 1))
        (not (ert-test-result-type-p result (car operands))))
       (satisfies
        (cl-assert (eql (length operands) 1))
        (funcall (car operands) result))))))

(defun ert-test-result-expected-p (test result)
  "Return non-nil if TEST's expected result type matches RESULT."
  (or
   (ert-test-result-type-p result :skipped)
   (ert-test-result-type-p result (ert-test-expected-result-type test))))

(defun ert-select-tests (selector universe)
  "Return a list of tests that match SELECTOR.

UNIVERSE specifies the set of tests to select from; it should be a list
of tests, or t, which refers to all tests named by symbols in `obarray'.

Valid SELECTORs:

nil  -- Selects the empty set.
t    -- Selects UNIVERSE.
:new -- Selects all tests that have not been run yet.
:failed, :passed       -- Select tests according to their most recent result.
:expected, :unexpected -- Select tests according to their most recent result.
a string -- A regular expression selecting all tests with matching names.
a test   -- (i.e., an object of the ert-test data-type) Selects that test.
a symbol -- Selects the test that the symbol names, errors if none.
\(member TESTS...) -- Selects the elements of TESTS, a list of tests
    or symbols naming tests.
\(eql TEST) -- Selects TEST, a test or a symbol naming a test.
\(and SELECTORS...) -- Selects the tests that match all SELECTORS.
\(or SELECTORS...)  -- Selects the tests that match any of the SELECTORS.
\(not SELECTOR)     -- Selects all tests that do not match SELECTOR.
\(tag TAG) -- Selects all tests that have TAG on their tags list.
    A tag is an arbitrary label you can apply when you define a test.
\(satisfies PREDICATE) -- Selects all tests that satisfy PREDICATE.
    PREDICATE is a function that takes an ert-test object as argument,
    and returns non-nil if it is selected.

Only selectors that require a superset of tests, such
as (satisfies ...), strings, :new, etc. make use of UNIVERSE.
Selectors that do not, such as (member ...), just return the
set implied by them without checking whether it is really
contained in UNIVERSE."
  ;; This code needs to match the cases in
  ;; `ert-insert-human-readable-selector'.
  (pcase-exhaustive selector
    ('nil nil)
    ('t (pcase-exhaustive universe
          ((pred listp) universe)
          (`t (ert-select-tests "" universe))))
    (:new (ert-select-tests
           `(satisfies ,(lambda (test)
                          (null (ert-test-most-recent-result test))))
           universe))
    (:failed (ert-select-tests
              `(satisfies ,(lambda (test)
                             (ert-test-result-type-p
                              (ert-test-most-recent-result test)
                              ':failed)))
              universe))
    (:passed (ert-select-tests
              `(satisfies ,(lambda (test)
                             (ert-test-result-type-p
                              (ert-test-most-recent-result test)
                              ':passed)))
              universe))
    (:expected (ert-select-tests
                `(satisfies
                  ,(lambda (test)
                     (ert-test-result-expected-p
                      test
                      (ert-test-most-recent-result test))))
                universe))
    (:unexpected (ert-select-tests `(not :expected) universe))
    ((pred stringp)
     (pcase-exhaustive universe
       (`t (mapcar #'ert-get-test
                   (apropos-internal selector #'ert-test-boundp)))
       ((pred listp)
        (cl-remove-if-not (lambda (test)
                            (and (ert-test-name test)
                                 (string-match selector
                                               (symbol-name
                                                (ert-test-name test)))))
                          universe))))
    ((pred ert-test-p) (list selector))
    ((pred symbolp)
     (cl-assert (ert-test-boundp selector))
     (list (ert-get-test selector)))
    (`(,operator . ,operands)
     (cl-ecase operator
       (member
        (mapcar (lambda (purported-test)
                  (pcase-exhaustive purported-test
                    ((pred symbolp)
                     (cl-assert (ert-test-boundp purported-test))
                     (ert-get-test purported-test))
                    ((pred ert-test-p) purported-test)))
                operands))
       (eql
        (cl-assert (eql (length operands) 1))
        (ert-select-tests `(member ,@operands) universe))
       (and
        ;; Do these definitions of AND, NOT and OR satisfy de
        ;; Morgan's laws?  Should they?
        (cl-case (length operands)
          (0 (ert-select-tests 't universe))
          (t (ert-select-tests `(and ,@(cdr operands))
                               (ert-select-tests (car operands)
                                                 universe)))))
       (not
        (cl-assert (eql (length operands) 1))
        (let ((all-tests (ert-select-tests 't universe)))
          (cl-set-difference all-tests
                             (ert-select-tests (car operands)
                                               all-tests))))
       (or
        (cl-case (length operands)
          (0 (ert-select-tests 'nil universe))
          (t (cl-union (ert-select-tests (car operands) universe)
                       (ert-select-tests `(or ,@(cdr operands))
                                         universe)))))
       (tag
        (cl-assert (eql (length operands) 1))
        (let ((tag (car operands)))
          (ert-select-tests `(satisfies
                              ,(lambda (test)
                                 (member tag (ert-test-tags test))))
                            universe)))
       (satisfies
        (cl-assert (eql (length operands) 1))
        (cl-remove-if-not (car operands)
                          (ert-select-tests 't universe)))))))

(defun ert--insert-human-readable-selector (selector)
  "Insert a human-readable presentation of SELECTOR into the current buffer."
  ;; This is needed to avoid printing the (huge) contents of the
  ;; `backtrace' slot of the result objects in the
  ;; `most-recent-result' slots of test case objects in (eql ...) or
  ;; (member ...) selectors.
  (cl-labels ((rec (selector)
                ;; This code needs to match the cases in
                ;; `ert-select-tests'.
                (pcase-exhaustive selector
                  ((or
                    ;; 'nil 't :new :failed :passed :expected :unexpected
                    (pred stringp)
                    (pred symbolp))
                   selector)
                  ((pred ert-test-p)
                   (if (ert-test-name selector)
                       (make-symbol (format "<%S>" (ert-test-name selector)))
                     (make-symbol "<unnamed test>")))
                  (`(,operator . ,operands)
                   (pcase operator
                     ((or 'member 'eql 'and 'not 'or)
                      `(,operator ,@(mapcar #'rec operands)))
                     ((or 'tag 'satisfies)
                      selector))))))
    (insert (format "%S" (rec selector)))))


;;; Facilities for running a whole set of tests.

;; The data structure that contains the set of tests being executed
;; during one particular test run, their results, the state of the
;; execution, and some statistics.
;;
;; The data about results and expected results of tests may seem
;; redundant here, since the test objects also carry such information.
;; However, the information in the test objects may be more recent, it
;; may correspond to a different test run.  We need the information
;; that corresponds to this run in order to be able to update the
;; statistics correctly when a test is re-run interactively and has a
;; different result than before.
(cl-defstruct ert--stats
  (selector (cl-assert nil))
  ;; The tests, in order.
  (tests (cl-assert nil) :type vector)
  ;; A map of test names (or the test objects themselves for unnamed
  ;; tests) to indices into the `tests' vector.
  (test-map (cl-assert nil) :type hash-table)
  ;; The results of the tests during this run, in order.
  (test-results (cl-assert nil) :type vector)
  ;; The start times of the tests, in order, as reported by
  ;; `current-time'.
  (test-start-times (cl-assert nil) :type vector)
  ;; The end times of the tests, in order, as reported by
  ;; `current-time'.
  (test-end-times (cl-assert nil) :type vector)
  (passed-expected 0)
  (passed-unexpected 0)
  (failed-expected 0)
  (failed-unexpected 0)
  (skipped 0)
  (start-time nil)
  (end-time nil)
  (aborted-p nil)
  (current-test nil)
  ;; The time at or after which the next redisplay should occur, as a
  ;; float.
  (next-redisplay 0.0))

(defun ert-stats-completed-expected (stats)
  "Return the number of tests in STATS that had expected results."
  (+ (ert--stats-passed-expected stats)
     (ert--stats-failed-expected stats)))

(defun ert-stats-completed-unexpected (stats)
  "Return the number of tests in STATS that had unexpected results."
  (+ (ert--stats-passed-unexpected stats)
     (ert--stats-failed-unexpected stats)))

(defun ert-stats-skipped (stats)
  "Number of tests in STATS that have skipped."
  (ert--stats-skipped stats))

(defun ert-stats-completed (stats)
  "Number of tests in STATS that have run so far."
  (+ (ert-stats-completed-expected stats)
     (ert-stats-completed-unexpected stats)
     (ert-stats-skipped stats)))

(defun ert-stats-total (stats)
  "Number of tests in STATS, regardless of whether they have run yet."
  (length (ert--stats-tests stats)))

;; The stats object of the current run, dynamically bound.  This is
;; used for the mode line progress indicator.
(defvar ert--current-run-stats nil)

(defun ert--stats-test-key (test)
  "Return the key used for TEST in the test map of ert--stats objects.

Returns the name of TEST if it has one, or TEST itself otherwise."
  (or (ert-test-name test) test))

(defun ert--stats-set-test-and-result (stats pos test result)
  "Change STATS by replacing the test at position POS with TEST and RESULT.

Also changes the counters in STATS to match."
  (let* ((tests (ert--stats-tests stats))
         (results (ert--stats-test-results stats))
         (old-test (aref tests pos))
         (map (ert--stats-test-map stats)))
    (cl-flet ((update (d)
                (if (ert-test-result-expected-p (aref tests pos)
                                                (aref results pos))
                    (cl-etypecase (aref results pos)
                      (ert-test-passed
                       (cl-incf (ert--stats-passed-expected stats) d))
                      (ert-test-failed
                       (cl-incf (ert--stats-failed-expected stats) d))
		      (ert-test-skipped
                       (cl-incf (ert--stats-skipped stats) d))
                      (null)
                      (ert-test-aborted-with-non-local-exit)
                      (ert-test-quit))
                  (cl-etypecase (aref results pos)
                    (ert-test-passed
                     (cl-incf (ert--stats-passed-unexpected stats) d))
                    (ert-test-failed
                     (cl-incf (ert--stats-failed-unexpected stats) d))
                    (ert-test-skipped
                     (cl-incf (ert--stats-skipped stats) d))
                    (null)
                    (ert-test-aborted-with-non-local-exit)
                    (ert-test-quit)))))
      ;; Adjust counters to remove the result that is currently in stats.
      (update -1)
      ;; Put new test and result into stats.
      (setf (aref tests pos) test
            (aref results pos) result)
      (remhash (ert--stats-test-key old-test) map)
      (setf (gethash (ert--stats-test-key test) map) pos)
      ;; Adjust counters to match new result.
      (update +1)
      nil)))

(defun ert--make-stats (tests selector)
  "Create a new `ert--stats' object for running TESTS.

SELECTOR is the selector that was used to select TESTS."
  (setq tests (cl-coerce tests 'vector))
  (let ((map (make-hash-table :size (length tests))))
    (cl-loop for i from 0
             for test across tests
             for key = (ert--stats-test-key test) do
             (cl-assert (not (gethash key map)))
             (setf (gethash key map) i))
    (make-ert--stats :selector selector
                     :tests tests
                     :test-map map
                     :test-results (make-vector (length tests) nil)
                     :test-start-times (make-vector (length tests) nil)
                     :test-end-times (make-vector (length tests) nil))))

(defun ert-run-or-rerun-test (stats test listener)
  ;; checkdoc-order: nil
  "Run the single test TEST and record the result using STATS and LISTENER."
  (let ((ert--current-run-stats stats)
        (pos (ert--stats-test-pos stats test)))
    (ert--stats-set-test-and-result stats pos test nil)
    ;; Call listener after setting/before resetting
    ;; (ert--stats-current-test stats); the listener might refresh the
    ;; mode line display, and if the value is not set yet/any more
    ;; during this refresh, the mode line will flicker unnecessarily.
    (setf (ert--stats-current-test stats) test)
    (funcall listener 'test-started stats test)
    (setf (ert-test-most-recent-result test) nil)
    (setf (aref (ert--stats-test-start-times stats) pos) (current-time))
    (unwind-protect
        (ert-run-test test)
      (setf (aref (ert--stats-test-end-times stats) pos) (current-time))
      (let ((result (ert-test-most-recent-result test)))
        (ert--stats-set-test-and-result stats pos test result)
        (funcall listener 'test-ended stats test result))
      (setf (ert--stats-current-test stats) nil))))

(defun ert-run-tests (selector listener &optional interactively)
  "Run the tests specified by SELECTOR, sending progress updates to LISTENER."
  (let* ((tests (ert-select-tests selector t))
         (stats (ert--make-stats tests selector)))
    (setf (ert--stats-start-time stats) (current-time))
    (funcall listener 'run-started stats)
    (let ((abortedp t))
      (unwind-protect
          (let ((ert--current-run-stats stats))
            (force-mode-line-update)
            (unwind-protect
		(cl-loop for test in tests do
			 (ert-run-or-rerun-test stats test listener)
			 (when (and interactively
				    (ert-test-quit-p
				     (ert-test-most-recent-result test))
				    (y-or-n-p "Abort testing? "))
			   (cl-return))
			 finally (setq abortedp nil))
              (setf (ert--stats-aborted-p stats) abortedp)
              (setf (ert--stats-end-time stats) (current-time))
              (funcall listener 'run-ended stats abortedp)))
        (force-mode-line-update))
      stats)))

(defun ert--stats-test-pos (stats test)
  ;; checkdoc-order: nil
  "Return the position (index) of TEST in the run represented by STATS."
  (gethash (ert--stats-test-key test) (ert--stats-test-map stats)))


;;; Formatting functions shared across UIs.

(defun ert--format-time-iso8601 (time)
  "Format TIME in the variant of ISO 8601 used for timestamps in ERT."
  (format-time-string "%Y-%m-%d %T%z" time))

(defun ert-char-for-test-result (result expectedp)
  "Return a character that represents the test result RESULT.

EXPECTEDP specifies whether the result was expected."
  (let ((s (cl-etypecase result
             (ert-test-passed ".P")
             (ert-test-failed "fF")
             (ert-test-skipped "sS")
             (null "--")
             (ert-test-aborted-with-non-local-exit "aA")
             (ert-test-quit "qQ"))))
    (elt s (if expectedp 0 1))))

(defun ert-string-for-test-result (result expectedp)
  "Return a string that represents the test result RESULT.

EXPECTEDP specifies whether the result was expected."
  (let ((s (cl-etypecase result
             (ert-test-passed '("passed" "PASSED"))
             (ert-test-failed '("failed" "FAILED"))
             (ert-test-skipped '("skipped" "SKIPPED"))
             (null '("unknown" "UNKNOWN"))
             (ert-test-aborted-with-non-local-exit '("aborted" "ABORTED"))
             (ert-test-quit '("quit" "QUIT")))))
    (elt s (if expectedp 0 1))))

(defun ert--pp-with-indentation-and-newline (object)
  "Pretty-print OBJECT, indenting it to the current column of point.
Ensures a final newline is inserted."
  (let ((begin (point))
        (pp-escape-newlines nil))
    (pp object (current-buffer))
    (unless (bolp) (insert "\n"))
    (save-excursion
      (goto-char begin)
      (indent-sexp))))

(defun ert--insert-infos (result)
  "Insert `ert-info' infos from RESULT into current buffer.

RESULT must be an `ert-test-result-with-condition'."
  (cl-check-type result ert-test-result-with-condition)
  (dolist (info (ert-test-result-with-condition-infos result))
    (cl-destructuring-bind (prefix . message) info
      (let ((begin (point))
            (indentation (make-string (+ (length prefix) 4) ?\s))
            (end nil))
        (unwind-protect
            (progn
              (insert message "\n")
              (setq end (point-marker))
              (goto-char begin)
              (insert "    " prefix)
              (forward-line 1)
              (while (< (point) end)
                (insert indentation)
                (forward-line 1)))
          (when end (set-marker end nil)))))))


;;; Running tests in batch mode.

(defvar ert-batch-backtrace-right-margin 70
  "The maximum line length for printing backtraces in `ert-run-tests-batch'.")

;;;###autoload
(defun ert-run-tests-batch (&optional selector)
  "Run the tests specified by SELECTOR, printing results to the terminal.

SELECTOR works as described in `ert-select-tests', except if
SELECTOR is nil, in which case all tests rather than none will be
run; this makes the command line \"emacs -batch -l my-tests.el -f
ert-run-tests-batch-and-exit\" useful.

Returns the stats object."
  (unless selector (setq selector 't))
  (ert-run-tests
   selector
   (lambda (event-type &rest event-args)
     (cl-ecase event-type
       (run-started
        (cl-destructuring-bind (stats) event-args
          (message "Running %s tests (%s)"
                   (length (ert--stats-tests stats))
                   (ert--format-time-iso8601 (ert--stats-start-time stats)))))
       (run-ended
        (cl-destructuring-bind (stats abortedp) event-args
          (let ((unexpected (ert-stats-completed-unexpected stats))
                (skipped (ert-stats-skipped stats))
		(expected-failures (ert--stats-failed-expected stats)))
            (message "\n%sRan %s tests, %s results as expected%s%s (%s)%s\n"
                     (if (not abortedp)
                         ""
                       "Aborted: ")
                     (ert-stats-total stats)
                     (ert-stats-completed-expected stats)
                     (if (zerop unexpected)
                         ""
                       (format ", %s unexpected" unexpected))
                     (if (zerop skipped)
                         ""
                       (format ", %s skipped" skipped))
                     (ert--format-time-iso8601 (ert--stats-end-time stats))
                     (if (zerop expected-failures)
                         ""
                       (format "\n%s expected failures" expected-failures)))
            (unless (zerop unexpected)
              (message "%s unexpected results:" unexpected)
              (cl-loop for test across (ert--stats-tests stats)
                       for result = (ert-test-most-recent-result test) do
                       (when (not (ert-test-result-expected-p test result))
                         (message "%9s  %S"
                                  (ert-string-for-test-result result nil)
                                  (ert-test-name test))))
              (message "%s" ""))
            (unless (zerop skipped)
              (message "%s skipped results:" skipped)
              (cl-loop for test across (ert--stats-tests stats)
                       for result = (ert-test-most-recent-result test) do
                       (when (ert-test-result-type-p result :skipped)
                         (message "%9s  %S"
                                  (ert-string-for-test-result result nil)
                                  (ert-test-name test))))
              (message "%s" "")))))
       (test-started
        )
       (test-ended
        (cl-destructuring-bind (stats test result) event-args
          (unless (ert-test-result-expected-p test result)
            (cl-etypecase result
              (ert-test-passed
               (message "Test %S passed unexpectedly" (ert-test-name test)))
              (ert-test-result-with-condition
               (message "Test %S backtrace:" (ert-test-name test))
               (with-temp-buffer
                 (ert--print-backtrace
                  (ert-test-result-with-condition-backtrace result)
                  nil)
                 (goto-char (point-min))
                 (while (not (eobp))
                   (let ((start (point))
                         (end (progn (end-of-line) (point))))
                     (setq end (min end
                                    (+ start ert-batch-backtrace-right-margin)))
                     (message "%s" (buffer-substring-no-properties
                                    start end)))
                   (forward-line 1)))
               (with-temp-buffer
                 (ert--insert-infos result)
                 (insert "    ")
                 (let ((print-escape-newlines t)
                       (print-level 5)
                       (print-length 10))
                   (ert--pp-with-indentation-and-newline
                    (ert-test-result-with-condition-condition result)))
                 (goto-char (1- (point-max)))
                 (cl-assert (looking-at "\n"))
                 (delete-char 1)
                 (message "Test %S condition:" (ert-test-name test))
                 (message "%s" (buffer-string))))
              (ert-test-aborted-with-non-local-exit
               (message "Test %S aborted with non-local exit"
                        (ert-test-name test)))
              (ert-test-quit
               (message "Quit during %S" (ert-test-name test)))))
          (let* ((max (prin1-to-string (length (ert--stats-tests stats))))
                 (format-string (concat "%9s  %"
                                        (prin1-to-string (length max))
                                        "s/" max "  %S")))
            (message format-string
                     (ert-string-for-test-result result
                                                 (ert-test-result-expected-p
                                                  test result))
                     (1+ (ert--stats-test-pos stats test))
                     (ert-test-name test)))))))
   nil))

;;;###autoload
(defun ert-run-tests-batch-and-exit (&optional selector)
  "Like `ert-run-tests-batch', but exits Emacs when done.

The exit status will be 0 if all test results were as expected, 1
on unexpected results, or 2 if the tool detected an error outside
of the tests (e.g. invalid SELECTOR or bug in the code that runs
the tests)."
  (or noninteractive
      (user-error "This function is only for use in batch mode"))
  ;; Better crash loudly than attempting to recover from undefined
  ;; behavior.
  (setq attempt-stack-overflow-recovery nil
        attempt-orderly-shutdown-on-fatal-signal nil)
  (unwind-protect
      (let ((stats (ert-run-tests-batch selector)))
        (kill-emacs (if (zerop (ert-stats-completed-unexpected stats)) 0 1)))
    (unwind-protect
        (progn
          (message "Error running tests")
          (backtrace))
      (kill-emacs 2))))


(defun ert-summarize-tests-batch-and-exit ()
  "Summarize the results of testing.
Expects to be called in batch mode, with logfiles as command-line arguments.
The logfiles should have the `ert-run-tests-batch' format.  When finished,
this exits Emacs, with status as per `ert-run-tests-batch-and-exit'."
  (or noninteractive
      (user-error "This function is only for use in batch mode"))
  ;; Better crash loudly than attempting to recover from undefined
  ;; behavior.
  (setq attempt-stack-overflow-recovery nil
        attempt-orderly-shutdown-on-fatal-signal nil)
  (let ((nlogs (length command-line-args-left))
        (ntests 0) (nrun 0) (nexpected 0) (nunexpected 0) (nskipped 0)
        nnotrun logfile notests badtests unexpected skipped)
    (with-temp-buffer
      (while (setq logfile (pop command-line-args-left))
        (erase-buffer)
        (when (file-readable-p logfile) (insert-file-contents logfile))
        (if (not (re-search-forward "^Running \\([0-9]+\\) tests" nil t))
            (push logfile notests)
          (setq ntests (+ ntests (string-to-number (match-string 1))))
          (if (not (re-search-forward "^\\(Aborted: \\)?\
Ran \\([0-9]+\\) tests, \\([0-9]+\\) results as expected\
\\(?:, \\([0-9]+\\) unexpected\\)?\
\\(?:, \\([0-9]+\\) skipped\\)?" nil t))
              (push logfile badtests)
            (if (match-string 1) (push logfile badtests))
            (setq nrun (+ nrun (string-to-number (match-string 2)))
                  nexpected (+ nexpected (string-to-number (match-string 3))))
            (when (match-string 4)
              (push logfile unexpected)
              (setq nunexpected (+ nunexpected
                                   (string-to-number (match-string 4)))))
            (when (match-string 5)
              (push logfile skipped)
              (setq nskipped (+ nskipped
                                (string-to-number (match-string 5)))))))))
    (setq nnotrun (- ntests nrun))
    (message "\nSUMMARY OF TEST RESULTS")
    (message "-----------------------")
    (message "Files examined: %d" nlogs)
    (message "Ran %d tests%s, %d results as expected%s%s"
             nrun
             (if (zerop nnotrun) "" (format ", %d failed to run" nnotrun))
             nexpected
             (if (zerop nunexpected)
                 ""
               (format ", %d unexpected" nunexpected))
             (if (zerop nskipped)
                 ""
               (format ", %d skipped" nskipped)))
    (when notests
      (message "%d files did not contain any tests:" (length notests))
      (mapc (lambda (l) (message "  %s" l)) notests))
    (when badtests
      (message "%d files did not finish:" (length badtests))
      (mapc (lambda (l) (message "  %s" l)) badtests))
    (when unexpected
      (message "%d files contained unexpected results:" (length unexpected))
      (mapc (lambda (l) (message "  %s" l)) unexpected))
    ;; More details on hydra, where the logs are harder to get to.
    (when (and (getenv "EMACS_HYDRA_CI")
               (not (zerop (+ nunexpected nskipped))))
      (message "\nDETAILS")
      (message "-------")
      (with-temp-buffer
        (dolist (x (list (list skipped "skipped" "SKIPPED")
                         (list unexpected "unexpected" "FAILED")))
          (mapc (lambda (l)
                  (erase-buffer)
                  (insert-file-contents l)
                  (message "%s:" l)
                  (when (re-search-forward (format "^[ \t]*[0-9]+ %s results:"
                                                   (nth 1 x))
                                           nil t)
                    (while (and (zerop (forward-line 1))
                                (looking-at (format "^[ \t]*%s" (nth 2 x))))
                      (message "%s" (buffer-substring (line-beginning-position)
                                                      (line-end-position))))))
                (car x)))))
    (kill-emacs (cond ((or notests badtests (not (zerop nnotrun))) 2)
                      (unexpected 1)
                      (t 0)))))

;;; Utility functions for load/unload actions.

(defun ert--activate-font-lock-keywords ()
  "Activate font-lock keywords for some of ERT's symbols."
  (font-lock-add-keywords
   nil
   '(("(\\(\\<ert-deftest\\)\\>\\s *\\(\\(?:\\sw\\|\\s_\\)+\\)?"
      (1 font-lock-keyword-face nil t)
      (2 font-lock-function-name-face nil t)))))

(cl-defun ert--remove-from-list (list-var element &key key test)
  "Remove ELEMENT from the value of LIST-VAR if present.

This can be used as an inverse of `add-to-list'."
  (unless key (setq key #'identity))
  (unless test (setq test #'equal))
  (setf (symbol-value list-var)
        (cl-remove element
                   (symbol-value list-var)
                   :key key
                   :test test)))


;;; Some basic interactive functions.

(defun ert-read-test-name (prompt &optional default history
                                  add-default-to-prompt)
  "Read the name of a test and return it as a symbol.

Prompt with PROMPT.  If DEFAULT is a valid test name, use it as a
default.  HISTORY is the history to use; see `completing-read'.
If ADD-DEFAULT-TO-PROMPT is non-nil, PROMPT will be modified to
include the default, if any.

Signals an error if no test name was read."
  (cl-etypecase default
    (string (let ((symbol (intern-soft default)))
              (unless (and symbol (ert-test-boundp symbol))
                (setq default nil))))
    (symbol (setq default
                  (if (ert-test-boundp default)
                      (symbol-name default)
                    nil)))
    (ert-test (setq default (ert-test-name default))))
  (when add-default-to-prompt
    (setq prompt (if (null default)
                     (format "%s: " prompt)
                   (format "%s (default %s): " prompt default))))
  (let ((input (completing-read prompt obarray #'ert-test-boundp
                                t nil history default nil)))
    ;; completing-read returns an empty string if default was nil and
    ;; the user just hit enter.
    (let ((sym (intern-soft input)))
      (if (ert-test-boundp sym)
          sym
        (user-error "Input does not name a test")))))

(defun ert-read-test-name-at-point (prompt)
  "Read the name of a test and return it as a symbol.
As a default, use the symbol at point, or the test at point if in
the ERT results buffer.  Prompt with PROMPT, augmented with the
default (if any)."
  (ert-read-test-name prompt (ert-test-at-point) nil t))

(defun ert-find-test-other-window (test-name)
  "Find, in another window, the definition of TEST-NAME."
  (interactive (list (ert-read-test-name-at-point "Find test definition: ")))
  (find-function-do-it test-name 'ert-deftest 'switch-to-buffer-other-window))

(defun ert-delete-test (test-name)
  "Make the test TEST-NAME unbound.

Nothing more than an interactive interface to `ert-make-test-unbound'."
  (interactive (list (ert-read-test-name-at-point "Delete test")))
  (ert-make-test-unbound test-name))

(defun ert-delete-all-tests ()
  "Make all symbols in `obarray' name no test."
  (interactive)
  (when (called-interactively-p 'any)
    (unless (y-or-n-p "Delete all tests? ")
      (user-error "Aborted")))
  ;; We can't use `ert-select-tests' here since that gives us only
  ;; test objects, and going from them back to the test name symbols
  ;; can fail if the `ert-test' defstruct has been redefined.
  (mapc #'ert-make-test-unbound (apropos-internal "" #'ert-test-boundp))
  t)


;;; Display of test progress and results.

;; An entry in the results buffer ewoc.  There is one entry per test.
(cl-defstruct ert--ewoc-entry
  (test (cl-assert nil))
  ;; If the result of this test was expected, its ewoc entry is hidden
  ;; initially.
  (hidden-p (cl-assert nil))
  ;; An ewoc entry may be collapsed to hide details such as the error
  ;; condition.
  ;;
  ;; I'm not sure the ability to expand and collapse entries is still
  ;; a useful feature.
  (expanded-p t)
  ;; By default, the ewoc entry presents the error condition with
  ;; certain limits on how much to print (`print-level',
  ;; `print-length').  The user can interactively switch to a set of
  ;; higher limits.
  (extended-printer-limits-p nil))

;; Variables local to the results buffer.

;; The ewoc.
(defvar ert--results-ewoc)
;; The stats object.
(defvar ert--results-stats)
;; A string with one character per test.  Each character represents
;; the result of the corresponding test.  The string is displayed near
;; the top of the buffer and serves as a progress bar.
(defvar ert--results-progress-bar-string)
;; The position where the progress bar button begins.
(defvar ert--results-progress-bar-button-begin)
;; The test result listener that updates the buffer when tests are run.
(defvar ert--results-listener)

(defun ert-insert-test-name-button (test-name)
  "Insert a button that links to TEST-NAME."
  (insert-text-button (format "%S" test-name)
                      :type 'ert--test-name-button
                      'ert-test-name test-name))

(defun ert--results-format-expected-unexpected (expected unexpected)
  "Return a string indicating EXPECTED expected results, UNEXPECTED unexpected."
  (if (zerop unexpected)
      (format "%s" expected)
    (format "%s (%s unexpected)" (+ expected unexpected) unexpected)))

(defun ert--results-update-ewoc-hf (ewoc stats)
  "Update the header and footer of EWOC to show certain information from STATS.

Also sets `ert--results-progress-bar-button-begin'."
  (let ((run-count (ert-stats-completed stats))
        (results-buffer (current-buffer))
        ;; Need to save buffer-local value.
        (font-lock font-lock-mode))
    (ewoc-set-hf
     ewoc
     ;; header
     (with-temp-buffer
       (insert "Selector: ")
       (ert--insert-human-readable-selector (ert--stats-selector stats))
       (insert "\n")
       (insert
        (format (concat "Passed:  %s\n"
                        "Failed:  %s\n"
                        "Skipped: %s\n"
                        "Total:   %s/%s\n\n")
                (ert--results-format-expected-unexpected
                 (ert--stats-passed-expected stats)
                 (ert--stats-passed-unexpected stats))
                (ert--results-format-expected-unexpected
                 (ert--stats-failed-expected stats)
                 (ert--stats-failed-unexpected stats))
                (ert-stats-skipped stats)
                run-count
                (ert-stats-total stats)))
       (insert
        (format "Started at:   %s\n"
                (ert--format-time-iso8601 (ert--stats-start-time stats))))
       ;; FIXME: This is ugly.  Need to properly define invariants of
       ;; the `stats' data structure.
       (let ((state (cond ((ert--stats-aborted-p stats) 'aborted)
                          ((ert--stats-current-test stats) 'running)
                          ((ert--stats-end-time stats) 'finished)
                          (t 'preparing))))
         (cl-ecase state
           (preparing
            (insert ""))
           (aborted
            (cond ((ert--stats-current-test stats)
                   (insert "Aborted during test: ")
                   (ert-insert-test-name-button
                    (ert-test-name (ert--stats-current-test stats))))
                  (t
                   (insert "Aborted."))))
           (running
            (cl-assert (ert--stats-current-test stats))
            (insert "Running test: ")
            (ert-insert-test-name-button (ert-test-name
                                          (ert--stats-current-test stats))))
           (finished
            (cl-assert (not (ert--stats-current-test stats)))
            (insert "Finished.")))
         (insert "\n")
         (if (ert--stats-end-time stats)
             (insert
              (format "%s%s\n"
                      (if (ert--stats-aborted-p stats)
                          "Aborted at:   "
                        "Finished at:  ")
                      (ert--format-time-iso8601 (ert--stats-end-time stats))))
           (insert "\n"))
         (insert "\n"))
       (let ((progress-bar-string (with-current-buffer results-buffer
                                    ert--results-progress-bar-string)))
         (let ((progress-bar-button-begin
                (insert-text-button progress-bar-string
                                    :type 'ert--results-progress-bar-button
                                    'face (or (and font-lock
                                                   (ert-face-for-stats stats))
                                              'button))))
           ;; The header gets copied verbatim to the results buffer,
           ;; and all positions remain the same, so
           ;; `progress-bar-button-begin' will be the right position
           ;; even in the results buffer.
           (with-current-buffer results-buffer
             (set (make-local-variable 'ert--results-progress-bar-button-begin)
                  progress-bar-button-begin))))
       (insert "\n\n")
       (buffer-string))
     ;; footer
     ;;
     ;; We actually want an empty footer, but that would trigger a bug
     ;; in ewoc, sometimes clearing the entire buffer.  (It's possible
     ;; that this bug has been fixed since this has been tested; we
     ;; should test it again.)
     "\n")))


(defvar ert-test-run-redisplay-interval-secs .1
  "How many seconds ERT should wait between redisplays while running tests.

While running tests, ERT shows the current progress, and this variable
determines how frequently the progress display is updated.")

(defun ert--results-update-stats-display (ewoc stats)
  "Update EWOC and the mode line to show data from STATS."
  ;; TODO(ohler): investigate using `make-progress-reporter'.
  (ert--results-update-ewoc-hf ewoc stats)
  (force-mode-line-update)
  (redisplay t)
  (setf (ert--stats-next-redisplay stats)
        (+ (float-time) ert-test-run-redisplay-interval-secs)))

(defun ert--results-update-stats-display-maybe (ewoc stats)
  "Call `ert--results-update-stats-display' if not called recently.

EWOC and STATS are arguments for `ert--results-update-stats-display'."
  (when (>= (float-time) (ert--stats-next-redisplay stats))
    (ert--results-update-stats-display ewoc stats)))

(defun ert--tests-running-mode-line-indicator ()
  "Return a string for the mode line that shows the test run progress."
  (let* ((stats ert--current-run-stats)
         (tests-total (ert-stats-total stats))
         (tests-completed (ert-stats-completed stats)))
    (if (>= tests-completed tests-total)
        (format " ERT(%s/%s,finished)" tests-completed tests-total)
      (format " ERT(%s/%s):%s"
              (1+ tests-completed)
              tests-total
              (if (null (ert--stats-current-test stats))
                  "?"
                (format "%S"
                        (ert-test-name (ert--stats-current-test stats))))))))

(defun ert--make-xrefs-region (begin end)
  "Attach cross-references to function names between BEGIN and END.

BEGIN and END specify a region in the current buffer."
  (save-excursion
    (goto-char begin)
    (while (progn
             (goto-char (+ (point) 2))
             (skip-syntax-forward "^w_")
             (< (point) end))
      (let* ((beg (point))
             (end (progn (skip-syntax-forward "w_") (point)))
             (sym (intern-soft (buffer-substring-no-properties
                                beg end)))
             (file (and sym (symbol-file sym 'defun))))
        (when file
          (goto-char beg)
          ;; help-xref-button needs to operate on something matched
          ;; by a regexp, so set that up for it.
          (re-search-forward "\\(\\sw\\|\\s_\\)+")
          (help-xref-button 0 'help-function-def sym file)))
      (forward-line 1))))

(defun ert--string-first-line (s)
  "Return the first line of S, or S if it contains no newlines.

The return value does not include the line terminator."
  (substring s 0 (cl-position ?\n s)))

(defun ert-face-for-test-result (expectedp)
  "Return a face that shows whether a test result was expected or unexpected.

If EXPECTEDP is nil, returns the face for unexpected results; if
non-nil, returns the face for expected results.."
  (if expectedp 'ert-test-result-expected 'ert-test-result-unexpected))

(defun ert-face-for-stats (stats)
  "Return a face that represents STATS."
  (cond ((ert--stats-aborted-p stats) 'nil)
        ((cl-plusp (ert-stats-completed-unexpected stats))
         (ert-face-for-test-result nil))
        ((eql (ert-stats-completed-expected stats) (ert-stats-total stats))
         (ert-face-for-test-result t))
        (t 'nil)))

(defun ert--print-test-for-ewoc (entry)
  "The ewoc print function for ewoc test entries.  ENTRY is the entry to print."
  (let* ((test (ert--ewoc-entry-test entry))
         (stats ert--results-stats)
         (result (let ((pos (ert--stats-test-pos stats test)))
                   (cl-assert pos)
                   (aref (ert--stats-test-results stats) pos)))
         (hiddenp (ert--ewoc-entry-hidden-p entry))
         (expandedp (ert--ewoc-entry-expanded-p entry))
         (extended-printer-limits-p (ert--ewoc-entry-extended-printer-limits-p
                                     entry)))
    (cond (hiddenp)
          (t
           (let ((expectedp (ert-test-result-expected-p test result)))
             (insert-text-button (format "%c" (ert-char-for-test-result
                                               result expectedp))
                                 :type 'ert--results-expand-collapse-button
                                 'face (or (and font-lock-mode
                                                (ert-face-for-test-result
                                                 expectedp))
                                           'button)))
           (insert " ")
           (ert-insert-test-name-button (ert-test-name test))
           (insert "\n")
           (when (and expandedp (not (eql result 'nil)))
             (when (ert-test-documentation test)
               (insert "    "
                       (propertize
                        (ert--string-first-line
                         (substitute-command-keys
                          (ert-test-documentation test)))
                        'font-lock-face 'font-lock-doc-face)
                       "\n"))
             (cl-etypecase result
               (ert-test-passed
                (if (ert-test-result-expected-p test result)
                    (insert "    passed\n")
                  (insert "    passed unexpectedly\n"))
                (insert ""))
               (ert-test-result-with-condition
                (ert--insert-infos result)
                (let ((print-escape-newlines t)
                      (print-level (if extended-printer-limits-p 12 6))
                      (print-length (if extended-printer-limits-p 100 10)))
                  (insert "    ")
                  (let ((begin (point)))
                    (ert--pp-with-indentation-and-newline
                     (ert-test-result-with-condition-condition result))
                    (ert--make-xrefs-region begin (point)))))
               (ert-test-aborted-with-non-local-exit
                (insert "    aborted\n"))
               (ert-test-quit
                (insert "    quit\n")))
             (insert "\n")))))
  nil)

(defun ert--results-font-lock-function (enabledp)
  "Redraw the ERT results buffer after font-lock-mode was switched on or off.

ENABLEDP is true if font-lock-mode is switched on, false
otherwise."
  (ert--results-update-ewoc-hf ert--results-ewoc ert--results-stats)
  (ewoc-refresh ert--results-ewoc)
  (font-lock-default-function enabledp))

(defun ert--setup-results-buffer (stats listener buffer-name)
  "Set up a test results buffer.

STATS is the stats object; LISTENER is the results listener;
BUFFER-NAME, if non-nil, is the buffer name to use."
  (unless buffer-name (setq buffer-name "*ert*"))
  (let ((buffer (get-buffer-create buffer-name)))
    (with-current-buffer buffer
      (let ((inhibit-read-only t))
        (buffer-disable-undo)
        (erase-buffer)
        (ert-results-mode)
        ;; Erase buffer again in case switching out of the previous
        ;; mode inserted anything.  (This happens e.g. when switching
        ;; from ert-results-mode to ert-results-mode when
        ;; font-lock-mode turns itself off in change-major-mode-hook.)
        (erase-buffer)
        (set (make-local-variable 'font-lock-function)
             'ert--results-font-lock-function)
        (let ((ewoc (ewoc-create 'ert--print-test-for-ewoc nil nil t)))
          (set (make-local-variable 'ert--results-ewoc) ewoc)
          (set (make-local-variable 'ert--results-stats) stats)
          (set (make-local-variable 'ert--results-progress-bar-string)
               (make-string (ert-stats-total stats)
                            (ert-char-for-test-result nil t)))
          (set (make-local-variable 'ert--results-listener) listener)
          (cl-loop for test across (ert--stats-tests stats) do
                   (ewoc-enter-last ewoc
                                    (make-ert--ewoc-entry :test test
                                                          :hidden-p t)))
          (ert--results-update-ewoc-hf ert--results-ewoc ert--results-stats)
          (goto-char (1- (point-max)))
          buffer)))))


(defvar ert--selector-history nil
  "List of recent test selectors read from terminal.")

;; Should OUTPUT-BUFFER-NAME and MESSAGE-FN really be arguments here?
;; They are needed only for our automated self-tests at the moment.
;; Or should there be some other mechanism?
;;;###autoload
(defun ert-run-tests-interactively (selector
                                    &optional output-buffer-name message-fn)
  "Run the tests specified by SELECTOR and display the results in a buffer.

SELECTOR works as described in `ert-select-tests'.
OUTPUT-BUFFER-NAME and MESSAGE-FN should normally be nil; they
are used for automated self-tests and specify which buffer to use
and how to display message."
  (interactive
   (list (let ((default (if ert--selector-history
                            ;; Can't use `first' here as this form is
                            ;; not compiled, and `first' is not
                            ;; defined without cl.
                            (car ert--selector-history)
                          "t")))
           (read
            (completing-read (if (null default)
                                 "Run tests: "
                               (format "Run tests (default %s): " default))
                             obarray #'ert-test-boundp nil nil
                             'ert--selector-history default nil)))
         nil))
  (unless message-fn (setq message-fn 'message))
  (let ((output-buffer-name output-buffer-name)
        buffer
        listener
        (message-fn message-fn))
    (setq listener
          (lambda (event-type &rest event-args)
            (cl-ecase event-type
              (run-started
               (cl-destructuring-bind (stats) event-args
                 (setq buffer (ert--setup-results-buffer stats
                                                         listener
                                                         output-buffer-name))
                 (pop-to-buffer buffer)))
              (run-ended
               (cl-destructuring-bind (stats abortedp) event-args
                 (funcall message-fn
                          "%sRan %s tests, %s results were as expected%s%s"
                          (if (not abortedp)
                              ""
                            "Aborted: ")
                          (ert-stats-total stats)
                          (ert-stats-completed-expected stats)
                          (let ((unexpected
                                 (ert-stats-completed-unexpected stats)))
                            (if (zerop unexpected)
                                ""
                              (format ", %s unexpected" unexpected)))
                          (let ((skipped
                                 (ert-stats-skipped stats)))
                            (if (zerop skipped)
                                ""
                              (format ", %s skipped" skipped))))
                 (ert--results-update-stats-display (with-current-buffer buffer
                                                      ert--results-ewoc)
                                                    stats)))
              (test-started
               (cl-destructuring-bind (stats test) event-args
                 (with-current-buffer buffer
                   (let* ((ewoc ert--results-ewoc)
                          (pos (ert--stats-test-pos stats test))
                          (node (ewoc-nth ewoc pos)))
                     (cl-assert node)
                     (setf (ert--ewoc-entry-test (ewoc-data node)) test)
                     (aset ert--results-progress-bar-string pos
                           (ert-char-for-test-result nil t))
                     (ert--results-update-stats-display-maybe ewoc stats)
                     (ewoc-invalidate ewoc node)))))
              (test-ended
               (cl-destructuring-bind (stats test result) event-args
                 (with-current-buffer buffer
                   (let* ((ewoc ert--results-ewoc)
                          (pos (ert--stats-test-pos stats test))
                          (node (ewoc-nth ewoc pos)))
                     (when (ert--ewoc-entry-hidden-p (ewoc-data node))
                       (setf (ert--ewoc-entry-hidden-p (ewoc-data node))
                             (ert-test-result-expected-p test result)))
                     (aset ert--results-progress-bar-string pos
                           (ert-char-for-test-result result
                                                     (ert-test-result-expected-p
                                                      test result)))
                     (ert--results-update-stats-display-maybe ewoc stats)
                     (ewoc-invalidate ewoc node))))))))
    (ert-run-tests selector listener t)))

;;;###autoload
(defalias 'ert 'ert-run-tests-interactively)


;;; Simple view mode for auxiliary information like stack traces or
;;; messages.  Mainly binds "q" for quit.

(define-derived-mode ert-simple-view-mode special-mode "ERT-View"
  "Major mode for viewing auxiliary information in ERT.")

;;; Commands and button actions for the results buffer.

(define-derived-mode ert-results-mode special-mode "ERT-Results"
  "Major mode for viewing results of ERT test runs.")

(cl-loop for (key binding) in
         '( ;; Stuff that's not in the menu.
           ("\t" forward-button)
           ([backtab] backward-button)
           ("j" ert-results-jump-between-summary-and-result)
           ("L" ert-results-toggle-printer-limits-for-test-at-point)
           ("n" ert-results-next-test)
           ("p" ert-results-previous-test)
           ;; Stuff that is in the menu.
           ("R" ert-results-rerun-all-tests)
           ("r" ert-results-rerun-test-at-point)
           ("d" ert-results-rerun-test-at-point-debugging-errors)
           ("." ert-results-find-test-at-point-other-window)
           ("b" ert-results-pop-to-backtrace-for-test-at-point)
           ("m" ert-results-pop-to-messages-for-test-at-point)
           ("l" ert-results-pop-to-should-forms-for-test-at-point)
           ("h" ert-results-describe-test-at-point)
           ("D" ert-delete-test)
           ("T" ert-results-pop-to-timings)
           )
         do
         (define-key ert-results-mode-map key binding))

(easy-menu-define ert-results-mode-menu ert-results-mode-map
  "Menu for `ert-results-mode'."
  '("ERT Results"
    ["Re-run all tests" ert-results-rerun-all-tests]
    "--"
    ;; FIXME?  Why are there (at least) 3 different ways to decide if
    ;; there is a test at point?
    ["Re-run test" ert-results-rerun-test-at-point
     :active (car (ert--results-test-at-point-allow-redefinition))]
    ["Debug test" ert-results-rerun-test-at-point-debugging-errors
     :active (car (ert--results-test-at-point-allow-redefinition))]
    ["Show test definition" ert-results-find-test-at-point-other-window
     :active (ert-test-at-point)]
    "--"
    ["Show backtrace" ert-results-pop-to-backtrace-for-test-at-point
     :active (ert--results-test-at-point-no-redefinition)]
    ["Show messages" ert-results-pop-to-messages-for-test-at-point
     :active (ert--results-test-at-point-no-redefinition)]
    ["Show `should' forms" ert-results-pop-to-should-forms-for-test-at-point
     :active (ert--results-test-at-point-no-redefinition)]
    ["Describe test" ert-results-describe-test-at-point
     :active (ert--results-test-at-point-no-redefinition)]
    "--"
    ["Delete test" ert-delete-test]
    "--"
    ["Show execution time of each test" ert-results-pop-to-timings]
    ))

(define-button-type 'ert--results-progress-bar-button
  'action #'ert--results-progress-bar-button-action
  'help-echo "mouse-2, RET: Reveal test result")

(define-button-type 'ert--test-name-button
  'action #'ert--test-name-button-action
  'help-echo "mouse-2, RET: Find test definition")

(define-button-type 'ert--results-expand-collapse-button
  'action #'ert--results-expand-collapse-button-action
  'help-echo "mouse-2, RET: Expand/collapse test result")

(defun ert--results-test-node-or-null-at-point ()
  "If point is on a valid ewoc node, return it; return nil otherwise.

To be used in the ERT results buffer."
  (let* ((ewoc ert--results-ewoc)
         (node (ewoc-locate ewoc)))
    ;; `ewoc-locate' will return an arbitrary node when point is on
    ;; header or footer, or when all nodes are invisible.  So we need
    ;; to validate its return value here.
    ;;
    ;; Update: I'm seeing nil being returned in some cases now,
    ;; perhaps this has been changed?
    (if (and node
             (>= (point) (ewoc-location node))
             (not (ert--ewoc-entry-hidden-p (ewoc-data node))))
        node
      nil)))

(defun ert--results-test-node-at-point ()
  "If point is on a valid ewoc node, return it; signal an error otherwise.

To be used in the ERT results buffer."
  (or (ert--results-test-node-or-null-at-point)
      (user-error "No test at point")))

(defun ert-results-next-test ()
  "Move point to the next test.

To be used in the ERT results buffer."
  (interactive)
  (ert--results-move (ewoc-locate ert--results-ewoc) 'ewoc-next
                     "No tests below"))

(defun ert-results-previous-test ()
  "Move point to the previous test.

To be used in the ERT results buffer."
  (interactive)
  (ert--results-move (ewoc-locate ert--results-ewoc) 'ewoc-prev
                     "No tests above"))

(defun ert--results-move (node ewoc-fn error-message)
  "Move point from NODE to the previous or next node.

EWOC-FN specifies the direction and should be either `ewoc-prev'
or `ewoc-next'.  If there are no more nodes in that direction, a
user-error is signaled with the message ERROR-MESSAGE."
  (cl-loop
   (setq node (funcall ewoc-fn ert--results-ewoc node))
   (when (null node)
     (user-error "%s" error-message))
   (unless (ert--ewoc-entry-hidden-p (ewoc-data node))
     (goto-char (ewoc-location node))
     (cl-return))))

(defun ert--results-expand-collapse-button-action (_button)
  "Expand or collapse the test node BUTTON belongs to."
  (let* ((ewoc ert--results-ewoc)
         (node (save-excursion
                 (goto-char (ert--button-action-position))
                 (ert--results-test-node-at-point)))
         (entry (ewoc-data node)))
    (setf (ert--ewoc-entry-expanded-p entry)
          (not (ert--ewoc-entry-expanded-p entry)))
    (ewoc-invalidate ewoc node)))

(defun ert-results-find-test-at-point-other-window ()
  "Find the definition of the test at point in another window.

To be used in the ERT results buffer."
  (interactive)
  (let ((name (ert-test-at-point)))
    (unless name
      (user-error "No test at point"))
    (ert-find-test-other-window name)))

(defun ert--test-name-button-action (button)
  "Find the definition of the test BUTTON belongs to, in another window."
  (let ((name (button-get button 'ert-test-name)))
    (ert-find-test-other-window name)))

(defun ert--ewoc-position (ewoc node)
  ;; checkdoc-order: nil
  "Return the position of NODE in EWOC, or nil if NODE is not in EWOC."
  (cl-loop for i from 0
           for node-here = (ewoc-nth ewoc 0) then (ewoc-next ewoc node-here)
           do (when (eql node node-here)
                (cl-return i))
           finally (cl-return nil)))

(defun ert-results-jump-between-summary-and-result ()
  "Jump back and forth between the test run summary and individual test results.

From an ewoc node, jumps to the character that represents the
same test in the progress bar, and vice versa.

To be used in the ERT results buffer."
  ;; Maybe this command isn't actually needed much, but if it is, it
  ;; seems like an indication that the UI design is not optimal.  If
  ;; jumping back and forth between a summary at the top of the buffer
  ;; and the error log in the remainder of the buffer is useful, then
  ;; the summary apparently needs to be easily accessible from the
  ;; error log, and perhaps it would be better to have it in a
  ;; separate buffer to keep it visible.
  (interactive)
  (let ((ewoc ert--results-ewoc)
        (progress-bar-begin ert--results-progress-bar-button-begin))
    (cond ((ert--results-test-node-or-null-at-point)
           (let* ((node (ert--results-test-node-at-point))
                  (pos (ert--ewoc-position ewoc node)))
             (goto-char (+ progress-bar-begin pos))))
          ((and (<= progress-bar-begin (point))
                (< (point) (button-end (button-at progress-bar-begin))))
           (let* ((node (ewoc-nth ewoc (- (point) progress-bar-begin)))
                  (entry (ewoc-data node)))
             (when (ert--ewoc-entry-hidden-p entry)
               (setf (ert--ewoc-entry-hidden-p entry) nil)
               (ewoc-invalidate ewoc node))
             (ewoc-goto-node ewoc node)))
          (t
           (goto-char progress-bar-begin)))))

(defun ert-test-at-point ()
  "Return the name of the test at point as a symbol, or nil if none."
  (or (and (eql major-mode 'ert-results-mode)
           (let ((test (ert--results-test-at-point-no-redefinition)))
             (and test (ert-test-name test))))
      (let* ((thing (thing-at-point 'symbol))
             (sym (intern-soft thing)))
        (and (ert-test-boundp sym)
             sym))))

(defun ert--results-test-at-point-no-redefinition (&optional error)
  "Return the test at point, or nil.
If optional argument ERROR is non-nil, signal an error rather than return nil.
To be used in the ERT results buffer."
  (cl-assert (eql major-mode 'ert-results-mode))
  (or
   (if (ert--results-test-node-or-null-at-point)
       (let* ((node (ert--results-test-node-at-point))
              (test (ert--ewoc-entry-test (ewoc-data node))))
         test)
     (let ((progress-bar-begin ert--results-progress-bar-button-begin))
       (when (and (<= progress-bar-begin (point))
                  (< (point) (button-end (button-at progress-bar-begin))))
         (let* ((test-index (- (point) progress-bar-begin))
                (test (aref (ert--stats-tests ert--results-stats)
                           test-index)))
           test))))
   (if error (user-error "No test at point"))))

(defun ert--results-test-at-point-allow-redefinition ()
  "Look up the test at point, and check whether it has been redefined.

To be used in the ERT results buffer.

Returns a list of two elements: the test (or nil) and a symbol
specifying whether the test has been redefined.

If a new test has been defined with the same name as the test at
point, replaces the test at point with the new test, and returns
the new test and the symbol `redefined'.

If the test has been deleted, returns the old test and the symbol
`deleted'.

If the test is still current, returns the test and the symbol nil.

If there is no test at point, returns a list with two nils."
  (let ((test (ert--results-test-at-point-no-redefinition)))
    (cond ((null test)
           `(nil nil))
          ((null (ert-test-name test))
           `(,test nil))
          (t
           (let* ((name (ert-test-name test))
                  (new-test (and (ert-test-boundp name)
                                 (ert-get-test name))))
             (cond ((eql test new-test)
                    `(,test nil))
                   ((null new-test)
                    `(,test deleted))
                   (t
                    (ert--results-update-after-test-redefinition
                     (ert--stats-test-pos ert--results-stats test)
                     new-test)
                    `(,new-test redefined))))))))

(defun ert--results-update-after-test-redefinition (pos new-test)
  "Update results buffer after the test at pos POS has been redefined.

Also updates the stats object.  NEW-TEST is the new test
definition."
  (let* ((stats ert--results-stats)
         (ewoc ert--results-ewoc)
         (node (ewoc-nth ewoc pos))
         (entry (ewoc-data node)))
    (ert--stats-set-test-and-result stats pos new-test nil)
    (setf (ert--ewoc-entry-test entry) new-test
          (aref ert--results-progress-bar-string pos) (ert-char-for-test-result
                                                       nil t))
    (ewoc-invalidate ewoc node))
  nil)

(defun ert--button-action-position ()
  "The buffer position where the last button action was triggered."
  (cond ((integerp last-command-event)
         (point))
        ((eventp last-command-event)
         (posn-point (event-start last-command-event)))
        (t (cl-assert nil))))

(defun ert--results-progress-bar-button-action (_button)
  "Jump to details for the test represented by the character clicked in BUTTON."
  (goto-char (ert--button-action-position))
  (ert-results-jump-between-summary-and-result))

(defun ert-results-rerun-all-tests ()
  "Re-run all tests, using the same selector.

To be used in the ERT results buffer."
  (interactive)
  (cl-assert (eql major-mode 'ert-results-mode))
  (let ((selector (ert--stats-selector ert--results-stats)))
    (ert-run-tests-interactively selector (buffer-name))))

(defun ert-results-rerun-test-at-point ()
  "Re-run the test at point.

To be used in the ERT results buffer."
  (interactive)
  (cl-destructuring-bind (test redefinition-state)
      (ert--results-test-at-point-allow-redefinition)
    (when (null test)
      (user-error "No test at point"))
    (let* ((stats ert--results-stats)
           (progress-message (format "Running %stest %S"
                                     (cl-ecase redefinition-state
                                       ((nil) "")
                                       (redefined "new definition of ")
                                       (deleted "deleted "))
                                     (ert-test-name test))))
      ;; Need to save and restore point manually here: When point is on
      ;; the first visible ewoc entry while the header is updated, point
      ;; moves to the top of the buffer.  This is undesirable, and a
      ;; simple `save-excursion' doesn't prevent it.
      (let ((point (point)))
        (unwind-protect
            (unwind-protect
                (progn
                  (message "%s..." progress-message)
                  (ert-run-or-rerun-test stats test
                                         ert--results-listener))
              (ert--results-update-stats-display ert--results-ewoc stats)
              (message "%s...%s"
                       progress-message
                       (let ((result (ert-test-most-recent-result test)))
                         (ert-string-for-test-result
                          result (ert-test-result-expected-p test result)))))
          (goto-char point))))))

(defun ert-results-rerun-test-at-point-debugging-errors ()
  "Re-run the test at point with `ert-debug-on-error' bound to t.

To be used in the ERT results buffer."
  (interactive)
  (let ((ert-debug-on-error t))
    (ert-results-rerun-test-at-point)))

(defun ert-results-pop-to-backtrace-for-test-at-point ()
  "Display the backtrace for the test at point.

To be used in the ERT results buffer."
  (interactive)
  (let* ((test (ert--results-test-at-point-no-redefinition t))
         (stats ert--results-stats)
         (pos (ert--stats-test-pos stats test))
         (result (aref (ert--stats-test-results stats) pos)))
    (cl-etypecase result
      (ert-test-passed (error "Test passed, no backtrace available"))
      (ert-test-result-with-condition
       (let ((backtrace (ert-test-result-with-condition-backtrace result))
             (buffer (get-buffer-create "*ERT Backtrace*")))
         (pop-to-buffer buffer)
         (let ((inhibit-read-only t))
           (buffer-disable-undo)
           (erase-buffer)
           (ert-simple-view-mode)
           (set-buffer-multibyte t)     ; mimic debugger-setup-buffer
           (setq truncate-lines t)
           (ert--print-backtrace backtrace t)
           (goto-char (point-min))
           (insert (substitute-command-keys "Backtrace for test `"))
           (ert-insert-test-name-button (ert-test-name test))
           (insert (substitute-command-keys "':\n"))))))))

(defun ert-results-pop-to-messages-for-test-at-point ()
  "Display the part of the *Messages* buffer generated during the test at point.

To be used in the ERT results buffer."
  (interactive)
  (let* ((test (ert--results-test-at-point-no-redefinition t))
         (stats ert--results-stats)
         (pos (ert--stats-test-pos stats test))
         (result (aref (ert--stats-test-results stats) pos)))
    (let ((buffer (get-buffer-create "*ERT Messages*")))
      (pop-to-buffer buffer)
      (let ((inhibit-read-only t))
        (buffer-disable-undo)
        (erase-buffer)
        (ert-simple-view-mode)
        (insert (ert-test-result-messages result))
        (goto-char (point-min))
        (insert (substitute-command-keys "Messages for test `"))
        (ert-insert-test-name-button (ert-test-name test))
        (insert (substitute-command-keys "':\n"))))))

(defun ert-results-pop-to-should-forms-for-test-at-point ()
  "Display the list of `should' forms executed during the test at point.

To be used in the ERT results buffer."
  (interactive)
  (let* ((test (ert--results-test-at-point-no-redefinition t))
         (stats ert--results-stats)
         (pos (ert--stats-test-pos stats test))
         (result (aref (ert--stats-test-results stats) pos)))
    (let ((buffer (get-buffer-create "*ERT list of should forms*")))
      (pop-to-buffer buffer)
      (let ((inhibit-read-only t))
        (buffer-disable-undo)
        (erase-buffer)
        (ert-simple-view-mode)
        (if (null (ert-test-result-should-forms result))
            (insert "\n(No should forms during this test.)\n")
          (cl-loop for form-description
                   in (ert-test-result-should-forms result)
                   for i from 1 do
                   (insert "\n")
                   (insert (format "%s: " i))
                   (let ((begin (point)))
                     (ert--pp-with-indentation-and-newline form-description)
                     (ert--make-xrefs-region begin (point)))))
        (goto-char (point-min))
        (insert (substitute-command-keys
                 "`should' forms executed during test `"))
        (ert-insert-test-name-button (ert-test-name test))
        (insert (substitute-command-keys "':\n"))
        (insert "\n")
        (insert (concat "(Values are shallow copies and may have "
                        "looked different during the test if they\n"
                        "have been modified destructively.)\n"))
        (forward-line 1)))))

(defun ert-results-toggle-printer-limits-for-test-at-point ()
  "Toggle how much of the condition to print for the test at point.

To be used in the ERT results buffer."
  (interactive)
  (let* ((ewoc ert--results-ewoc)
         (node (ert--results-test-node-at-point))
         (entry (ewoc-data node)))
    (setf (ert--ewoc-entry-extended-printer-limits-p entry)
          (not (ert--ewoc-entry-extended-printer-limits-p entry)))
    (ewoc-invalidate ewoc node)))

(defun ert-results-pop-to-timings ()
  "Display test timings for the last run.

To be used in the ERT results buffer."
  (interactive)
  (let* ((stats ert--results-stats)
         (buffer (get-buffer-create "*ERT timings*"))
         (data (cl-loop for test across (ert--stats-tests stats)
                        for start-time across (ert--stats-test-start-times
                                               stats)
                        for end-time across (ert--stats-test-end-times stats)
                        collect (list test
                                      (float-time (time-subtract
                                                   end-time start-time))))))
    (setq data (sort data (lambda (a b)
                            (> (cl-second a) (cl-second b)))))
    (pop-to-buffer buffer)
    (let ((inhibit-read-only t))
      (buffer-disable-undo)
      (erase-buffer)
      (ert-simple-view-mode)
      (if (null data)
          (insert "(No data)\n")
        (insert (format "%-3s  %8s %8s\n" "" "time" "cumul"))
        (cl-loop for (test time) in data
                 for cumul-time = time then (+ cumul-time time)
                 for i from 1 do
                 (progn
                   (insert (format "%3s: %8.3f %8.3f " i time cumul-time))
                   (ert-insert-test-name-button (ert-test-name test))
                   (insert "\n"))))
      (goto-char (point-min))
      (insert "Tests by run time (seconds):\n\n")
      (forward-line 1))))

;;;###autoload
(defun ert-describe-test (test-or-test-name)
  "Display the documentation for TEST-OR-TEST-NAME (a symbol or ert-test)."
  (interactive (list (ert-read-test-name-at-point "Describe test")))
  (when (< emacs-major-version 24)
    (user-error "Requires Emacs 24 or later"))
  (let (test-name
        test-definition)
    (cl-etypecase test-or-test-name
      (symbol (setq test-name test-or-test-name
                    test-definition (ert-get-test test-or-test-name)))
      (ert-test (setq test-name (ert-test-name test-or-test-name)
                      test-definition test-or-test-name)))
    (help-setup-xref (list #'ert-describe-test test-or-test-name)
                     (called-interactively-p 'interactive))
    (save-excursion
      (with-help-window (help-buffer)
        (with-current-buffer (help-buffer)
          (insert (if test-name (format "%S" test-name) "<anonymous test>"))
          (insert " is a test")
          (let ((file-name (and test-name
                                (symbol-file test-name 'ert--test))))
            (when file-name
              (insert (format-message " defined in `%s'"
                                      (file-name-nondirectory file-name)))
              (save-excursion
                (re-search-backward (substitute-command-keys "`\\([^`']+\\)'")
                                    nil t)
                (help-xref-button 1 'help-function-def test-name file-name)))
            (insert ".")
            (fill-region-as-paragraph (point-min) (point))
            (insert "\n\n")
            (unless (and (ert-test-boundp test-name)
                         (eql (ert-get-test test-name) test-definition))
              (let ((begin (point)))
                (insert "Note: This test has been redefined or deleted, "
                        "this documentation refers to an old definition.")
                (fill-region-as-paragraph begin (point)))
              (insert "\n\n"))
            (insert (substitute-command-keys
                     (or (ert-test-documentation test-definition)
                         "It is not documented."))
                    "\n")))))))

(defun ert-results-describe-test-at-point ()
  "Display the documentation of the test at point.

To be used in the ERT results buffer."
  (interactive)
  (ert-describe-test (ert--results-test-at-point-no-redefinition t)))


;;; Actions on load/unload.

(add-to-list 'find-function-regexp-alist '(ert-deftest . ert--find-test-regexp))
(add-to-list 'minor-mode-alist '(ert--current-run-stats
                                 (:eval
                                  (ert--tests-running-mode-line-indicator))))
(add-hook 'emacs-lisp-mode-hook #'ert--activate-font-lock-keywords)

(defun ert--unload-function ()
  "Unload function to undo the side-effects of loading ert.el."
  (ert--remove-from-list 'find-function-regexp-alist 'ert-deftest :key #'car)
  (ert--remove-from-list 'minor-mode-alist 'ert--current-run-stats :key #'car)
  (ert--remove-from-list 'emacs-lisp-mode-hook
                         'ert--activate-font-lock-keywords)
  nil)

(defvar ert-unload-hook '())
(add-hook 'ert-unload-hook #'ert--unload-function)


(provide 'ert)

;;; ert.el ends here

debug log:

solving c232b08bd1 ...
found c232b08bd1 in https://git.savannah.gnu.org/cgit/emacs.git

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this external index

	https://git.savannah.gnu.org/cgit/emacs.git
	https://git.savannah.gnu.org/cgit/emacs/org-mode.git

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.