@CheckForNull
  public FileData fileData(String path) {
    return fileDataByPath.get(path);
  }
@Test
  public void test_file_data_when_file_exists() {
    FileData fileData = repository.fileData("/Abc.java");

    assertNotNull(fileData);
    assertThat(fileData.hash()).isEqualTo("123");
    assertThat(fileData.revision()).isEqualTo("456");
  }