Changing User in MVC 2 MockHttpContext breaks Test?

Changing User in MVC 2 MockHttpContext breaks Test?

I changed the following line:

private readonly IPrincipal _user =         new GenericPrincipal(new GenericIdentity("someUser"), null /* roles */); 


 private readonly IPrincipal _user =         new GenericPrincipal(new GenericIdentity("realUser"), null /* roles */); 

and the following test broke, but I am not sure why and I am not sure how to trace it. I am new to TDD

    [TestMethod]     public void ChangePassword_Post_ReturnsRedirectOnSuccess()     {         // Arrange         AccountController controller = GetAccountController();         ChangePasswordModel model = new ChangePasswordModel()         {             OldPassword = "goodOldPassword",             NewPassword = "goodNewPassword",             ConfirmPassword = "goodNewPassword"         };          // Act         ActionResult result = controller.ChangePassword(model);          // Assert         Assert.IsInstanceOfType(result, typeof(RedirectToRouteResult));         RedirectToRouteResult redirectResult = (RedirectToRouteResult)result;         Assert.AreEqual("ChangePasswordSuccess", redirectResult.RouteValues["action"]);     } 

An explanation of how this works and why changing someUser to realUser would break the above test would be very helpful.

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