public void Walker_DeleteWalkerAd()
{
Walker Walker = (Walker)UserFactory.CreateWalker("WalkerDel", "testnaLozinka", "Ivan", "Horvat", "123456789", "Unska 3", "Zagreb", 40, UserType.WALKER, true, false);
WalkerAd WalkerAd = (WalkerAd)AdFactory.CreateWalkerAd(40.0, "Setam pse POVOLJNO", AdStatus.ACTIVE,
"Obozavam pse", new DateTime(2019, 8, 28, 12, 5, 0), 3, 4, Walker);
Walker.AddAd((WalkerAd)WalkerAd);
UserRepository repository = new UserRepository();
repository.AddUser(Walker);
Walker.DeleteAd((WalkerAd)WalkerAd);
Debug.Assert(Walker.Ads.Count == 0);
repository.DeleteUser(Walker);
}