public class MockUsers
    {
        public IEnumerable<User> Users()
        {
            List<User> listOfUsers = new List<User>();
                listOfUsers.Add(new User
                {
                    Email = "Test123@test.com",
                     Name = "Name " + 1,
                     Password = "Test123!",
                     UserId = 1,
                     Username = "Test123",
                     IsAdmin = true,
                });
            return listOfUsers;

        }

    }



 public class UserRepository
    {
        MockUsers context = new MockUsers();
        public User GetByUsernameAndPassword(User user)
        {
            return context.Users.Where(u => u.Username == user.Username & u.Password == user.Password).FirstOrDefault();
        }
    }