def test_merge_totals(self):
r = Payment.mergeTotals({"A": 5, "B": 7}, {"A": 5, "C": 3})
self.assertEqual(r, {"A": 10, "B": 7, "C": 3})
def test_abstract_payments_totals(self):
a = Person("a")
b = Person("b")
payments = (Payment((a, b), 4), Payment((a,), 3), Payment((b,), 5))
r = Payment.computeTotals(payments)
self.assertEqual(r, {a: 5, b: 7})