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Hello I am new in TDD development. I came across this post for Using asp.net mvc to upload file Phil Haack states that a class could be used for file upload control, in which he use the default HttpFileCollectionValueProvider: [HttpPost] public ActionResult Index(HttpPostedFileBase file) { if (file.ContentLength > 0) { var fileName = Path.GetFileName(file.FileName); var path = Path.Combine(Server.MapPath("~/App_Data/uploads"), fileName); file.SaveAs(path); } return RedirectToAction("Index"); } the value is bounded in a form as <form action="" method="post" enctype="multipart/form-data"> <label for="file">Filename:</label> <input type="file" name="file" id="file" /> <input type="submit" /> </form> Note that the HttpPostedFileBase is parsed as a parameter into the controller with the name "file" in the html form and as parsing parameter in Index controller. I have two questions: 1. How can I verify the file.SaveAs method? 2. I am not quite sure how to unit test with this. In the test controller file I should have a fake HttpPostedFileBase but it is sealed. Does anyone have some strategies to deal with this? Thank you very much!

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