public async Task ItDoesNotCreateANewGamingGroupIfUserIsBeingLinkedToAnExistingOne()
{
await userRegisterer.RegisterUser(newUser);
firstTimeUserAuthenticatorMock.AssertWasNotCalled(mock => mock.CreateGamingGroupAndSendEmailConfirmation(
Arg<ApplicationUser>.Is.Anything,
Arg<TransactionSource>.Is.Anything));
}