public static Builder builder(String bucket, String testClassName, Credentials credentials) {
    checkArgument(!bucket.equals(""));
    checkArgument(!testClassName.equals(""));

    return new Builder(bucket, testClassName, credentials);
  }
@Test
  public void testBuilderWithEmptyBucket() {
    assertThrows(
        IllegalArgumentException.class,
        () -> GcsResourceManager.builder("", TEST_CLASS, null).build());
  }