public void UserIDExistTest()
{
AuthentificationService a = new AuthentificationService();
a.SetupAuth();
a.SignupUser(new Utility.Network.Users.CryptedCredentials("User1", "abc"));
Assert.AreEqual(true, a.UserIDExist("abc"));
Assert.AreEqual(false, a.UserIDExist("abC"));
File.Delete(@"users.xml");
}