+test_expect_success 'rev-parse --show-object-format in repo' '
+ echo "$(test_oid algo)" >expect &&
+ git rev-parse --show-object-format >actual &&
+ test_cmp expect actual &&
+ git rev-parse --show-object-format=storage >actual &&
+ test_cmp expect actual &&
+ git rev-parse --show-object-format=input >actual &&
+ test_cmp expect actual &&
+ git rev-parse --show-object-format=output >actual &&
+ test_cmp expect actual &&
+ test_must_fail git rev-parse --show-object-format=squeamish-ossifrage 2>err &&
+ grep "unknown mode for --show-object-format: squeamish-ossifrage" err
+'
+