new EqualsTester()
        .addEqualityGroup(parameters.get(0))
        .addEqualityGroup(parameters.get(1))
        .testEquals();
  }

  public void testConstructor_call() throws Exception {
    Invokable<?, Prepender> delegate = Prepender.constructor(String.class, int.class);
    Prepender prepender = delegate.invoke(null, "a", 1);
    assertEquals("a", prepender.prefix);