@Test
  public final void testRemoveHtmlComponent() {
    // mocks
    ZkButton button = createMock(ZkButton.class);

    // expect removing component
    ZkHtmlComponentUtil.removeComponentFromContainer(button, (Component) component);

    // perform test
    replayAll();
    component.removeHtmlComponent(button);
    verifyAll();
  }
  @Test
  public final void testAddHtmlComponent() {
    // mocks
    ZkButton button = createMock(ZkButton.class);

    // expect adding component
    ZkHtmlComponentUtil.addComponentToContainer(button, (Component) component);

    // perform test
    replayAll();
    component.addHtmlComponent(button);
    verifyAll();
  }