bash prompt: use bash builtins to check stash state

diff --git a/t/t3400-rebase.sh b/t/t3400-rebase.sh
index 45a55e98038e074b2f2056973bf3414983805f8e..ff86725b7beba19c138b33bd874d31fd540c026e 100755 (executable)
--- a/t/t3400-rebase.sh
+++ b/t/t3400-rebase.sh
@@ -134,7 +134,7 @@ test_expect_success 'default to @{upstream} when upstream arg is missing' '
 test_expect_success 'rebase -q is quiet' '
        git checkout -b quiet topic &&
        git rebase -q master >output.out 2>&1 &&
-       test ! -s output.out
+       test_must_be_empty output.out
 '
 
 test_expect_success 'Rebase a commit that sprinkles CRs in' '