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| | ;;; json-tests.el --- unit tests for json.c -*- lexical-binding: t; -*-
;; Copyright (C) 2017 Free Software Foundation, Inc.
;; 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Unit tests for src/json.c.
;;; Code:
(require 'cl-lib)
(require 'map)
(ert-deftest json-serialize/roundtrip ()
(skip-unless (fboundp 'json-serialize))
;; The noncharacter U+FFFF should be passed through,
;; cf. https://www.unicode.org/faq/private_use.html#noncharacters.
(let ((lisp [:null :false t 0 123 -456 3.75 "abc\uFFFFαβγ𝔸𝐁𝖢\"\\"])
(json "[null,false,true,0,123,-456,3.75,\"abc\uFFFFαβγ𝔸𝐁𝖢\\\"\\\\\"]"))
(should (equal (json-serialize lisp) json))
(with-temp-buffer
(json-insert lisp)
(should (equal (buffer-string) json))
(should (eobp)))
(should (equal (json-parse-string json) lisp))
(with-temp-buffer
(insert json)
(goto-char 1)
(should (equal (json-parse-buffer) lisp))
(should (eobp)))))
(ert-deftest json-serialize/object ()
(skip-unless (fboundp 'json-serialize))
(let ((table (make-hash-table :test #'equal)))
(puthash "abc" [1 2 t] table)
(puthash "def" :null table)
(should (equal (json-serialize table)
"{\"abc\":[1,2,true],\"def\":null}"))))
(ert-deftest json-parse-string/object ()
(skip-unless (fboundp 'json-parse-string))
(let ((input
"{ \"abc\" : [1, 2, true], \"def\" : null, \"abc\" : [9, false] }\n"))
(let ((actual (json-parse-string input)))
(should (hash-table-p actual))
(should (equal (hash-table-count actual) 2))
(should (equal (cl-sort (map-pairs actual) #'string< :key #'car)
'(("abc" . [9 :false]) ("def" . :null)))))
(should (equal (json-parse-string input :object-type 'alist)
'((abc . [9 :false]) (def . :null))))))
(ert-deftest json-parse-string/string ()
(skip-unless (fboundp 'json-parse-string))
(should-error (json-parse-string "[\"formfeed\f\"]") :type 'json-parse-error)
(should (equal (json-parse-string "[\"foo \\\"bar\\\"\"]") ["foo \"bar\""]))
(should (equal (json-parse-string "[\"abcαβγ\"]") ["abcαβγ"]))
(should (equal (json-parse-string "[\"\\nasd\\u0444\\u044b\\u0432fgh\\t\"]")
["\nasdфывfgh\t"]))
(should (equal (json-parse-string "[\"\\uD834\\uDD1E\"]") ["\U0001D11E"]))
(should-error (json-parse-string "foo") :type 'json-parse-error))
(ert-deftest json-serialize/string ()
(skip-unless (fboundp 'json-serialize))
(should (equal (json-serialize ["foo"]) "[\"foo\"]"))
(should (equal (json-serialize ["a\n\fb"]) "[\"a\\n\\fb\"]"))
(should (equal (json-serialize ["\nasdфыв\u001f\u007ffgh\t"])
"[\"\\nasdфыв\\u001F\u007ffgh\\t\"]"))
(should (equal (json-serialize ["a\0b"]) "[\"a\\u0000b\"]")))
(ert-deftest json-serialize/invalid-unicode ()
(skip-unless (fboundp 'json-serialize))
;; FIXME: "out of memory" is the wrong error signal, but we don't
;; currently distinguish between error types when serializing.
(should-error (json-serialize ["a\uDBBBb"]) :type 'json-out-of-memory)
(should-error (json-serialize ["u\x110000v"]) :type 'json-out-of-memory)
(should-error (json-serialize ["u\x3FFFFFv"]) :type 'json-out-of-memory)
(should-error (json-serialize ["u\xCCv"]) :type 'json-out-of-memory))
(ert-deftest json-parse-string/null ()
(skip-unless (fboundp 'json-parse-string))
(should-error (json-parse-string "\x00") :type 'wrong-type-argument)
;; FIXME: Reconsider whether this is the right behavior.
(should-error (json-parse-string "[a\\u0000b]") :type 'json-parse-error))
(ert-deftest json-parse-string/invalid-unicode ()
"Some examples from
https://www.cl.cam.ac.uk/~mgk25/ucs/examples/UTF-8-test.txt."
(skip-unless (fboundp 'json-parse-string))
;; Invalid UTF-8 code unit sequences.
(should-error (json-parse-string "[\"\x80\"]") :type 'json-parse-error)
(should-error (json-parse-string "[\"\xBF\"]") :type 'json-parse-error)
(should-error (json-parse-string "[\"\xFE\"]") :type 'json-parse-error)
(should-error (json-parse-string "[\"\xC0\xAF\"]") :type 'json-parse-error)
(should-error (json-parse-string "[\"\xC0\x80\"]") :type 'json-parse-error)
;; Surrogates.
(should-error (json-parse-string "[\"\uDB7F\"]")
:type 'json-parse-error)
(should-error (json-parse-string "[\"\xED\xAD\xBF\"]")
:type 'json-parse-error)
(should-error (json-parse-string "[\"\uDB7F\uDFFF\"]")
:type 'json-parse-error)
(should-error (json-parse-string "[\"\xED\xAD\xBF\xED\xBF\xBF\"]")
:type 'json-parse-error))
(ert-deftest json-parse-string/incomplete ()
(skip-unless (fboundp 'json-parse-string))
(should-error (json-parse-string "[123") :type 'json-end-of-file))
(ert-deftest json-parse-string/trailing ()
(skip-unless (fboundp 'json-parse-string))
(should-error (json-parse-string "[123] [456]") :type 'json-trailing-content))
(ert-deftest json-parse-buffer/incomplete ()
(skip-unless (fboundp 'json-parse-buffer))
(with-temp-buffer
(insert "[123")
(goto-char 1)
(should-error (json-parse-buffer) :type 'json-end-of-file)
(should (bobp))))
(ert-deftest json-parse-buffer/trailing ()
(skip-unless (fboundp 'json-parse-buffer))
(with-temp-buffer
(insert "[123] [456]")
(goto-char 1)
(should (equal (json-parse-buffer) [123]))
(should-not (bobp))
(should (looking-at-p (rx " [456]" eos)))))
(provide 'json-tests)
;;; json-tests.el ends here
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