t7501: add test of "commit --dry-run --short"

diff --git a/t/t0090-cache-tree.sh b/t/t0090-cache-tree.sh
index 28ea93f509c0a9a932897e45316be9f188ad4259..7de40141ca84dc53657d81c0254870b387339f79 100755 (executable)
--- a/t/t0090-cache-tree.sh
+++ b/t/t0090-cache-tree.sh
@@ -239,7 +239,7 @@ test_expect_success 'no phantom error when switching trees' '
        >newdir/one &&
        git add newdir/one &&
        git checkout 2>errors &&
-       ! test -s errors
+       test_must_be_empty errors
 '
 
 test_expect_success 'switching trees does not invalidate shared index' '