public void Should_append_class_to_existing_one()
{
attributes["class"] = "foo";
HtmlAttributesContainerExtensions.AppendCssClass(container.Object, "bar");
Assert.Equal("foo bar", attributes["class"]);
}
public void Should_add_a_css_class_to_attributes_collection_if_not_present()
{
HtmlAttributesContainerExtensions.AppendCssClass(container.Object, "foo");
Assert.Equal("foo", attributes["class"]);
}