tests: make use of the test_must_be_empty function

diff --git a/t/t1410-reflog.sh b/t/t1410-reflog.sh
index 553e26d9ceb83fc6529beb95ff71ffa0a899a166..8293131001ee0e816406df858dc47bc2fb9be3ce 100755 (executable)
--- a/t/t1410-reflog.sh
+++ b/t/t1410-reflog.sh
@@ -339,8 +339,8 @@ test_expect_failure 'reflog with non-commit entries displays all entries' '
 '
 
 test_expect_success 'reflog expire operates on symref not referrent' '
-       git branch -l the_symref &&
-       git branch -l referrent &&
+       git branch --create-reflog the_symref &&
+       git branch --create-reflog referrent &&
        git update-ref referrent HEAD &&
        git symbolic-ref refs/heads/the_symref refs/heads/referrent &&
        test_when_finished "rm -f .git/refs/heads/referrent.lock" &&