string api_def_overwrites = R"(op: <
  graph_op_name: "TestCApi"
  summary: "New summary"
>
)";
  status = TF_NewStatus();
  TF_ApiDefMapPut(api_def_map, api_def_overwrites.c_str(),
                  api_def_overwrites.size(), status);
  EXPECT_EQ(TF_OK, TF_GetCode(status)) << TF_Message(status);
  TF_DeleteStatus(status);

  string op_name = "TestCApi";
  status = TF_NewStatus();
  auto* api_def_buf =

  status = file->Tell(&position);
  EXPECT_EQ(status.code(), Code::OK);
  EXPECT_EQ(position, test_data.size());
}

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