public void verifyStatus() {
    if (sequential) {
      boolean unopenedIterator = responseIterator == null && !responses.isEmpty();
      if (unopenedIterator || responseIterator.hasNext()) {
        throw new VerificationAssertionError("More executions were expected");
      }
    }
  }
@Test
  void hitMock() {
    List<Contributor> contributors = github.contributors("netflix", "feign");
    assertThat(contributors).hasSize(30);
    mockClient.verifyStatus();
  }