UIComponent form = root.findComponent("testForm1");
UIComponent compositeComponent = form.getChildren().get(0);
// "resolve" #{cc.attrs}
CompositeComponentELResolver resolver = new CompositeComponentELResolver();
Object attrs = resolver.getValue(facesContext.getELContext(), compositeComponent, "attrs");
// the resolved value has to be a CompositeComponentExpressionHolder
Assert.assertTrue(attrs instanceof CompositeComponentExpressionHolder);
// get the actual ValueExpression which is needed by the BeanValidator