From acf1efe1f4c03aead1bd74ca1d8a8c39363fd255 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kristian=20H=C3=B8gsberg?= <krh@bitplanet.net>
Date: Mon, 11 Feb 2013 13:58:39 -0500
Subject: [PATCH] tests: Add a help message for the test runner

In case we forget the name of the test case or typo it, the test runner
will now list the test cases in the test binary.
---
 tests/test-runner.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/tests/test-runner.c b/tests/test-runner.c
index 8c79dff6..9c6865a4 100644
--- a/tests/test-runner.c
+++ b/tests/test-runner.c
@@ -89,6 +89,24 @@ find_test(const char *name)
 	return NULL;
 }
 
+static void
+usage(const char *name, int status)
+{
+	const struct test *t;
+
+	fprintf(stderr, "Usage: %s [TEST]\n\n"
+		"With no arguments, run all test.  Specify test case to run\n"
+		"only that test without forking.  Available tests:\n\n",
+		name);
+
+	for (t = &__start_test_section; t < &__stop_test_section; t++)
+		fprintf(stderr, "  %s\n", t->name);
+
+	fprintf(stderr, "\n");
+
+	exit(status);
+}
+
 static void
 run_test(const struct test *t)
 {
@@ -119,11 +137,14 @@ int main(int argc, char *argv[])
 
 	leak_check_enabled = !getenv("NO_ASSERT_LEAK_CHECK");
 
+	if (argc == 2 && strcmp(argv[1], "--help") == 0)
+		usage(argv[0], EXIT_SUCCESS);
+
 	if (argc == 2) {
 		t = find_test(argv[1]);
 		if (t == NULL) {
 			fprintf(stderr, "unknown test: \"%s\"\n", argv[1]);
-			exit(EXIT_FAILURE);
+			usage(argv[0], EXIT_FAILURE);
 		}
 
 		run_test(t);