}

  private static class GoodNullsFactory {
    @Keep
    public static Object good(String s) {
      return new GoodNulls(s);
    }
  }

  public void testNullsOnReturnValues_bad() throws Exception {
    try {
      tester.forAllPublicStaticMethods(BadNullsFactory.class).thatReturn(Object.class).testNulls();
    } catch (AssertionError expected) {
      return;
    }
    fail();