t5100: Avoid filename "nul"

diff --git a/t/t3903-stash.sh b/t/t3903-stash.sh
index aa282e1bc1e17f08dd12fc1980187c786f1de99b..2d3ee3b78c66e4e964fffccaa1ae8252929c1732 100755 (executable)
--- a/t/t3903-stash.sh
+++ b/t/t3903-stash.sh
@@ -34,7 +34,7 @@ EOF
 test_expect_success 'parents of stash' '
        test $(git rev-parse stash^) = $(git rev-parse HEAD) &&
        git diff stash^2..stash > output &&
-       diff -u output expect
+       test_cmp output expect
 '
 
 test_expect_success 'apply needs clean working directory' '