public void Adding_An_Account_To_An_Exisiting_User_Returns_One_Account_For_User()
{
var accountGuid = Guid.NewGuid();
var fakeReaderWriter = A.Fake <IReaderWriter>();
A.CallTo(() => fakeReaderWriter.ReadEnumerable <User>(_path)).Returns(_users);
var userRepo = new UserRepo(fakeReaderWriter, _path);
userRepo.AddAccountToUser(_user.UserGuid, accountGuid);
A.CallTo(() => fakeReaderWriter.WriteEnumerable(A <string> .Ignored, A <IEnumerable <User> > .Ignored)).MustHaveHappened(Repeated.Exactly.Times(1));
Assert.That(1, Is.EqualTo(userRepo.GetUser(_user.UserGuid).AccountGuid.Count));
}
