public async Task Join_NewUser_CreateLeagueUser()
{
var user = DbContextUtility.AddNew <ApplicationUser>(dbContext);
var league1 = LeagueUtility.CreateLeague(dbContext);
var league2 = LeagueUtility.CreateLeague(dbContext);
await testObj.Join(league1.ID, user.Id);
var leagueUser = await testObj.Join(league2.ID, user.Id);
Assert.AreEqual(user.Id, leagueUser.UserID);
Assert.AreEqual(league2.ID, leagueUser.LeagueID);
}