[PATCH 1/4] test: Add `test_emacs_expect_t'.

[David Edmondson <dme@dme.org>]

Add a new test function to allow simpler testing of emacs
functionality.

`test_emacs_expect_t' takes two arguments:
  - the name of the test,
  - some lisp to evaluate.

The test passes if the lisp returns `t', otherwise it fails and the
output is reported to the tester.
---
 test/emacs-test-functions.sh |    8 ++++++++
 test/notmuch-test            |    1 +
 test/test-lib.sh             |   24 ++++++++++++++++++++++++
 3 files changed, 33 insertions(+), 0 deletions(-)
 create mode 100755 test/emacs-test-functions.sh

diff --git a/test/emacs-test-functions.sh b/test/emacs-test-functions.sh
new file mode 100755
index 0000000..969cc78
--- /dev/null
+++ b/test/emacs-test-functions.sh
@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+test_description="emacs test function sanity"
+. test-lib.sh
+
+test_emacs_expect_t "emacs test function sanity" 't'
+
+test_done
diff --git a/test/notmuch-test b/test/notmuch-test
index 6a99ae3..d034f99 100755
--- a/test/notmuch-test
+++ b/test/notmuch-test
@@ -52,6 +52,7 @@ TESTS="
   python
   hooks
   argument-parsing
+  emacs-test-functions.sh
 "
 TESTS=${NOTMUCH_TESTS:=$TESTS}
 
diff --git a/test/test-lib.sh b/test/test-lib.sh
index 7c9ce24..15da973 100644
--- a/test/test-lib.sh
+++ b/test/test-lib.sh
@@ -503,6 +503,30 @@ test_expect_equal_file ()
     fi
 }
 
+test_emacs_expect_t () {
+	test "$#" = 2 || error "bug in the test script: not 2 parameters to test_emacs_expect_t"
+	test_reset_state_
+	if ! test_skip "$1"
+	then
+		# We cannot call 'test_emacs' in a subshell, because
+		# the setting of EMACS_SERVER would not persist
+		# throughout a sequence of tests, so we use a
+		# temporary file.
+		tmp="$TMPDIR"; if [ -z "$tmp" ]; then tmp=/tmp; fi
+		output="$tmp/test_emacs_output.$$"
+		test_emacs "$2" >"${output}"
+		result=$(cat "${output}")
+		rm -f "${output}"
+
+		if [ "$result" == t ]
+		then
+			test_ok_ "$1"
+		else
+			test_failure_ "$1" "$(eval printf ${result})"
+		fi
+	fi
+}
+
 NOTMUCH_NEW ()
 {
     notmuch new | grep -v -E -e '^Processed [0-9]*( total)? file|Found [0-9]* total file'
-- 
1.7.7.3