1 files changed, 4 insertions, 0 deletions
diff --git a/tests/lib b/tests/lib
index 9948c31..0ae9bbc 100644
--- a/tests/lib
+++ b/tests/lib
@@ -241,6 +241,10 @@ t-clean-on-branch () {
 
 t-git-get-ref () {
 	local ref=$1
+	case "$ref" in
+	refs/*)	;;
+	*) fail "t-git-get-ref bad $ref" ;;
+	esac
 	git show-ref -d $1 | perl -ne '
 		$x = $1 if m#^(\w+) \Q'$1'\E(?:\^\{\})?$#;
 		END { print "$x\n" if length $x; }