}

  public void testCheckNotNull_simpleMessage_success() {
    String result = checkNotNull(NON_NULL_STRING, IGNORE_ME);
    assertSame(NON_NULL_STRING, result);
  }

  public void testCheckNotNull_simpleMessage_failure() {
    NullPointerException expected =
        assertThrows(NullPointerException.class, () -> checkNotNull(null, new Message()));
    verifySimpleMessage(expected);
  }