@Override
  public String getScheme() {
    return "gs";
  }
@Test
  public void testGetScheme() {
    // Tests gcs paths.
    assertEquals("gs", toResourceIdentifier("gs://my_bucket/tmp dir/").getScheme());

    // Tests bucket with no ending '/'.
    assertEquals("gs", toResourceIdentifier("gs://my_bucket").getScheme());
  }