EXPECT_PRED2(UnimplementedOrReturnsCode, status, Code::OK);
  if (!status.ok()) GTEST_SKIP() << "GetFileSize() not supported: " << status;
  EXPECT_EQ(size, test_data.size());
}

TEST_P(ModularFileSystemTest, TestFileExists) {
  const std::string filepath = GetURIForPath("a_file");
  std::unique_ptr<WritableFile> file;
  Status status = env_->NewWritableFile(filepath, &file);
  if (!status.ok())