t0012: test "-h" with builtins

peff · gitster · commit d691551192ac · 2017-06-05T11:43:33.000+09:00
Since commit 99caeed (Let 'git <command> -h' show usage without a git dir, 2009-11-09), the git wrapper handles "-h" specially, skipping any repository setup but still calling the builtin's cmd_foo() function. This means that every cmd_foo() must be ready to handle this case, but we don't have any systematic tests. This led to "git am -h" being broken for some time without anybody noticing. This patch just tests that "git foo -h" works for every builtin, where we see a 129 exit code (the normal code for our usage() helper), and that the word "usage" appears in the output. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/t/t0012-help.sh b/t/t0012-help.sh
@@ -49,4 +49,16 @@ test_expect_success "--help does not work for guides" "
 	test_i18ncmp expect actual
 "
 
+test_expect_success 'generate builtin list' '
+	git --list-builtins >builtins
+'
+
+while read builtin
+do
+	test_expect_success "$builtin can handle -h" '
+		test_expect_code 129 git $builtin -h >output 2>&1 &&
+		test_i18ngrep usage output
+	'
+done <builtins
+
 test_done
