tests: use 'test_must_be_empty' instead of '! test -s'

diff --git a/t/t5570-git-daemon.sh b/t/t5570-git-daemon.sh
index 0d4c52016b2b3651fa638fcc416f22d236c87fc2..12c1e43a843023bc582cef2321a58d10c30b83a1 100755 (executable)
--- a/t/t5570-git-daemon.sh
+++ b/t/t5570-git-daemon.sh
@@ -51,7 +51,7 @@ test_expect_success 'no-op fetch -v stderr is as expected' '
 
 test_expect_success 'no-op fetch without "-v" is quiet' '
        (cd clone && git fetch 2>../stderr) &&
-       ! test -s stderr
+       test_must_be_empty stderr
 '
 
 test_expect_success 'remote detects correct HEAD' '