t5304: use helper to report failure of "test foo = bar"

For small outputs, we sometimes use:

  test "$(some_cmd)" = "something we expect"

instead of a full test_cmp. The downside of this is that
when it fails, there is no output at all from the script.
Let's introduce a small helper to make tests easier to
debug.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index dafd6ad21a..b7957b87bb 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -634,6 +634,15 @@ test_cmp_bin() {
 	cmp "$@"
 }
 
+# Call any command "$@" but be more verbose about its
+# failure. This is handy for commands like "test" which do
+# not output anything when they fail.
+verbose () {
+	"$@" && return 0
+	echo >&2 "command failed: $(git rev-parse --sq-quote "$@")"
+	return 1
+}
+
 # Check if the file expected to be empty is indeed empty, and barfs
 # otherwise.