assertThrows(IllegalArgumentException.class, () -> checkArgument(false));
  }

  public void testCheckArgument_simpleMessage_success() {
    checkArgument(true, IGNORE_ME);
  }

  public void testCheckArgument_simpleMessage_failure() {
    IllegalArgumentException expected =
        assertThrows(IllegalArgumentException.class, () -> checkArgument(false, new Message()));
    verifySimpleMessage(expected);
  }