* Tests whether a defaults handler for a child source with a class restriction can be registered.
     */
    @Test
    public void testRegisterChildDefaultsHandlerWithStartClass()
    {
        DefaultParametersManager manager = EasyMock.createMock(DefaultParametersManager.class);
        DefaultParametersHandler<BuilderParameters> handler = createDefaultsHandlerMock();
        manager.registerDefaultsHandler(BuilderParameters.class, handler, FileBasedBuilderParameters.class);
        EasyMock.replay(manager, handler);
        CombinedBuilderParametersImpl params = new CombinedBuilderParametersImpl();
        params.setChildDefaultParametersManager(manager);
        assertSame("Wrong result", params, params.registerChildDefaultsHandler(BuilderParameters.class, handler, FileBasedBuilderParameters.class));
        EasyMock.verify(manager);