@Test
public void testMutateRowAsync() throws Exception {

  RowMutation rowMutation = RowMutation.create(TABLE_ID, ROW_KEY);
  when(dataClientV2.mutateRowAsync(rowMutation))
      .thenReturn(ApiFutures.<Void>immediateFuture(null));
  dataGCJClient.mutateRowAsync(rowMutation).get();
  verify(dataClientV2).mutateRowAsync(rowMutation);
}