t/Makefile: add a rule to re-run previously-failed tests

diff --git a/t/t5601-clone.sh b/t/t5601-clone.sh
index a43339420019718b76963d5ced92ebb981b0f0ed..4241ea5b32db4a0a85810dfe6421a161ce55fc46 100755 (executable)
--- a/t/t5601-clone.sh
+++ b/t/t5601-clone.sh
@@ -151,7 +151,7 @@ test_expect_success 'clone --mirror does not repeat tags' '
        git clone --mirror src mirror2 &&
        (cd mirror2 &&
         git show-ref 2> clone.err > clone.out) &&
-       test_must_fail grep Duplicate mirror2/clone.err &&
+       ! grep Duplicate mirror2/clone.err &&
        grep some-tag mirror2/clone.out
 
 '