public final void doesNotContain(@Nullable Object element) {
    if (Iterables.contains(checkNotNull(actual), element)) {
      failWithActual("expected not to contain", element);
    }
  }
@Test
  public void iterableDoesNotContainFailure() {
    expectFailureWhenTestingThat(asList(1, 2, 3)).doesNotContain(2);
    assertFailureKeys("expected not to contain", "but was");
    assertFailureValue("expected not to contain", "2");
  }