tests: Move assert_fail function to tests/libtest.sh

This moves the assert_fail function definition which was defined
and called in tests/test-remote-headers.sh. Done in preparation
for use of the assert_fail function in other test files.

Closes: #1669
Approved by: jlebon

1 files changed, 9 insertions, 0 deletions

diff --git a/tests/libtest.sh b/tests/libtest.sh
index 388408df..f09f4a2c 100755
--- a/tests/libtest.sh
+++ b/tests/libtest.sh
@@ -648,3 +648,12 @@ assert_not_ref () {
         fatal "rev-parse $2 unexpectedly succeeded!"
     fi
 }
+
+assert_fail () {
+  set +e
+  $@
+  if [ $? = 0 ] ; then
+    echo 1>&2 "$@ did not fail"; exit 1
+  fi
+  set -euo pipefail
+}