public void CheckThatPayoutsOccurCorrectly()
{
// ARRANGE
IStokvel s = new Stokvel(4, 1000);
IMember a = Substitute.For <IMember>();
s.AddMember(a);
IMember b = Substitute.For <IMember>();
s.AddMember(b);
IMember c = Substitute.For <IMember>();
s.AddMember(c);
// ACT
s.NextMeeting();
s.NextMeeting();
s.NextMeeting();
s.NextMeeting();
// ASSERT
a.Received(1).PayOut(Arg.Any <int>());
b.DidNotReceive().PayOut(Arg.Any <int>());
c.DidNotReceive().PayOut(Arg.Any <int>());
}