}

  public void testNulls_parameterOptionalNotInstantiable() throws Exception {
    tester.testNulls(ConstructorParameterWithOptionalNotInstantiable.class);
  }

  public void testEnumFailsToCheckNull() throws Exception {
    try {
      tester.testNulls(EnumFailsToCheckNull.class);
    } catch (AssertionError expected) {
      return;
    }
    fail("should have failed");
  }