Introduce usagef() that takes a printf-style format

diff --git a/t/t3501-revert-cherry-pick.sh b/t/t3501-revert-cherry-pick.sh
index 6da212825a447866364979c2fb10778b6bbc02d5..bb4cf00d78637b3bdf0c4e3da99291e0ab3c718f 100755 (executable)
--- a/t/t3501-revert-cherry-pick.sh
+++ b/t/t3501-revert-cherry-pick.sh
@@ -45,6 +45,7 @@ test_expect_success 'cherry-pick after renaming branch' '
 
        git checkout rename2 &&
        git cherry-pick added &&
+       test $(git rev-parse HEAD^) = $(git rev-parse rename2) &&
        test -f opos &&
        grep "Add extra line at the end" opos
 
@@ -54,6 +55,7 @@ test_expect_success 'revert after renaming branch' '
 
        git checkout rename1 &&
        git revert added &&
+       test $(git rev-parse HEAD^) = $(git rev-parse rename1) &&
        test -f spoo &&
        ! grep "Add extra line at the end" spoo