public void Test_RegisterUserWithLoggedInUser_ShouldRegisterUser() { string username = "******"; string password = "******"; var tracker = new IssueTracker(); tracker.RegisterUser(username, password, password); tracker.LoginUser(username, password); string otherUsername = "******"; string viewResult = tracker.RegisterUser(otherUsername, password, password); Assert.AreEqual("There is already a logged in user", viewResult); }