public void LogoutTests()
{
// logout tests
ClientController cc2 = new ClientController();
// Assert.IsFalse(cc2.Logout());//try to logout without any register and login
cc2.Register("alice", "123456");
Assert.IsTrue(cc2.Logout());//try to logout without login
cc2.Login("alice", "123456");
Assert.IsTrue(cc2.Logout());//try to logout after login
}