Created Unassigned: UrlHelper class in Web API is hard to mock [977]

None of the methods are virtual making it hard to mock and hence test. It would be great if these could be made virtual:

public string Link(string routeName, IDictionary<string, object> routeValues);
public string Link(string routeName, object routeValues);
public string Route(string routeName, IDictionary<string, object> routeValues);
public string Route(string routeName, object routeValues);

Thanks

Henrik