public async Task ItCreatesANewGamingGroupForTheUser()
{
await firstTimeAuthenticator.CreateGamingGroupAndSendEmailConfirmation(applicationUser, registrationSource);
gamingGroupSaverMock.AssertWasCalled(mock => mock.CreateNewGamingGroup(
Arg<string>.Is.Equal(applicationUser.UserName + "'s Gaming Group"),
Arg<TransactionSource>.Is.Equal(registrationSource),
Arg<ApplicationUser>.Is.Same(applicationUser)));
}