public void TestRemoveUser()
{
_authorizationService = new AbilityAuthorizationService(new UserRepository(), new RoleRepository(), new AbilityRepository());
_authorizationService.AddUser(_user1);
_authorizationService.AddUser(_user2);
IEnumerable<IUser> users = _authorizationService.GetUsers();
Assert.AreEqual(2, users.Count());
Assert.AreEqual(_user1, users.First());
Assert.AreEqual(_user2, users.Last());
_authorizationService.RemoveUser("User1");
users = _authorizationService.GetUsers();
Assert.AreEqual(1, users.Count());
Assert.AreEqual(_user2, users.First());
}