auto reader = gcs_client->ReadObject(bucket, object);
  if (!reader) {
    return ::testing::AssertionFailure() << reader.status().message();
  } else {
    std::string content{std::istreambuf_iterator<char>{reader}, {}};
    return CompareSubString(offset, length, content, content.length());
  }
}

TEST_F(GCSFilesystemTest, ParseGCSPath) {
  std::string bucket, object;