public void GetUserId()
{
// arrange
var users = new Mock<IUsersRepository>();
var forms = new Mock<IFormsAuthentication>();
var hash = new HashService();
var service = new AuthenticationService(users.Object, forms.Object, hash);
users.Setup(u => u.Users).Returns(new List<User> { new User { Email = "*****@*****.**", PasswordHash = hash.CreateMD5Hash("111"), Id = 1, Temp = false } }.AsQueryable());
// act
var id = service.GetUserIdByEmail("*****@*****.**");
// assert
Assert.That(id, Is.EqualTo(1));
}