credential: let helpers tell us to quit

diff --git a/t/t0300-credentials.sh b/t/t0300-credentials.sh
index 57ea5a10c5c716f52a8c8c7335ac7f68fe9dd92d..d7ef44b4a261a588874df3b8359d809655286a43 100755 (executable)
--- a/t/t0300-credentials.sh
+++ b/t/t0300-credentials.sh
@@ -289,4 +289,13 @@ test_expect_success 'http paths can be part of context' '
        EOF
 '
 
+test_expect_success 'helpers can abort the process' '
+       test_must_fail git \
+               -c credential.helper="!f() { echo quit=1; }; f" \
+               -c credential.helper="verbatim foo bar" \
+               credential fill >stdout &&
+       >expect &&
+       test_cmp expect stdout
+'
+
 test_done