test-lib: add the '--stress' option to run a test repeatedly under load

diff --git a/t/t4201-shortlog.sh b/t/t4201-shortlog.sh
index 58c27736762dde372408a4dacfb030f0e1a55b99..d3a7ce6bbb2ca926d200f099d25d26570a3c1ce6 100755 (executable)
--- a/t/t4201-shortlog.sh
+++ b/t/t4201-shortlog.sh
@@ -192,7 +192,7 @@ test_expect_success 'shortlog with revision pseudo options' '
 
 test_expect_success 'shortlog with --output=<file>' '
        git shortlog --output=shortlog -1 master >output &&
-       test ! -s output &&
+       test_must_be_empty output &&
        test_line_count = 3 shortlog
 '