@Test
public void testCallableStale() throws Exception {

  ListenableFuture<MutateRowResponse> rowFuture = underTest.add(createRequestEntry());
  setResponse(Status.OK);
  MutateRowResponse result = rowFuture.get(10, TimeUnit.MILLISECONDS);
  Assert.assertTrue(rowFuture.isDone());
  Assert.assertEquals(MutateRowResponse.getDefaultInstance(), result);
  Assert.assertFalse(operationAccountant.hasInflightOperations());
}