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I am testing code in a MVC HTML helper that throws an error when trying to get the application path: //appropriate code that uses System.IO.Path to get directory that results in: string path = "~\\Views\\directory\\subdirectory\\fileName.cshtml"; htmlHelper.Partial(path, model, viewData); //exception thrown here The exception that is thrown is System.Web.HttpException: The application relative virtual path '~/Views/directory/subdirectory/fileName.cshtml' cannot be made absolute, because the path to the application is not known. Following the advice of How to resolve issue with image path when testing HtmlHelper? I have faked (using Moq): Request.Url to return a string Request.RawUrl to return a string Request.ApplicationPath to return a string Request.ServerVariables to return a null NameValueCollection Response.ApplyAppPathModifier(string virtualPath) to return a string What else is needed to be able to allow this code to run in the context of a unit test run? Or What other approach should I be taking to render a Partial view on a dynamically built string?

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