public void UserEngine_VerifyUser()
        {
            //Arrange: Seed the Mocked Accessor's lists of Users and creates an expected list of Users
            SeedUsers();
            List <User> expected = new List <User>
            {
                new User
                {
                    Id       = 1,
                    Email    = "*****@*****.**",
                    Password = "******"
                },
                new User
                {
                    Id       = 2,
                    Email    = "*****@*****.**",
                    Password = "******"
                },
                new User
                {
                    Id       = 3,
                    Email    = "*****@*****.**",
                    Password = "******"
                }
            };


            //Act: Creates a result list and adds the return value of the UserEngine VerifyUser() method to the list
            List <User> results = new List <User>();

            for (int i = 0; i < mockedUserAccessor.GetState().Count; i++)
            {
                var user = userEngine.VerifyUser(expected.ElementAt(i).Email, expected.ElementAt(i).Password);
                results.Add(user);
            }


            //Assert: Checks whether each User in the expected and results lists are equal
            for (int i = 0; i < expected.Count; i++)
            {
                Assert.AreEqual(expected.ElementAt(i), results.ElementAt(i), $"User {i} was retrieved incorrectly.");
            }
        }