check_describe tags/c --all c
check_describe heads/branch_A --all --match='branch_*' branch_A
+test_expect_success 'describe complains about tree object' '
+ test_must_fail git describe HEAD^{tree}
+'
+
+test_expect_success 'describe complains about missing object' '
+ test_must_fail git describe $_z40
+'
+
test_done