public void merge_testing()
{
var secondFactory = new TagFactory();
secondFactory.AddBuilder(new LambdaElementBuilder(def => def.Is <int>(),
def => request => new TextboxTag().AddClass("integer")));
secondFactory.AddModifier(new LambdaElementModifier(def => true, def => (r, t) => t.AddClass("editor")));
factory.Merge(secondFactory);
HtmlTag tag = For(x => x.Order);
tag.ShouldHaveClass("integer");
tag.ShouldHaveClass("editor");
}