1 files changed, 7 insertions, 0 deletions
diff --git a/tests/lib b/tests/lib
index 70cda8f..7a5ede5 100644
--- a/tests/lib
+++ b/tests/lib
@@ -46,6 +46,13 @@ fail () {
 	exit 1
 }
 
+t-expect-fail () {
+	local mpat="$1"; shift
+	LC_MESSAGES=C "$@" 2>&1 | tee $tmp/t.output
+	test ${PIPESTATUS[0]} != 0
+	egrep "$mpat" $tmp/t.output ||false
+}
+
 t-untar () {
 	local tarfile=$1.tar
 	local edittree=$1.edit