@Test
public void testComposeObjects() throws IOException {

  gcs.composeObjects(TEST_STORAGE_RESOURCE_IDS, TEST_STORAGE_RESOURCE_ID, TEST_OBJECT_OPTIONS);
  verify(mockGcsDelegate)
      .composeObjects(
          eq(TEST_STORAGE_RESOURCE_IDS), eq(TEST_STORAGE_RESOURCE_ID), eq(TEST_OBJECT_OPTIONS));
}