def test_two_payments_involved(self):
o1 = Person.objects.create(name=u'Owner 1', owner=True)
o2 = Person.objects.create(name=u'Owner 2', owner=True)
ex = Expense.objects.create(date=date(2011, 11, 12))
ex.payment_set.create(ammount=900, paid_by=o1)
ex.payment_set.create(ammount=100, paid_by=o2)
ex.responsibility_set.create(ammount=300, owner=o1)
ex.responsibility_set.create(ammount=700, owner=o2)
ex = Expense.objects.create(date=date(2011, 11, 12))
ex.payment_set.create(ammount=2000, paid_by=o2)
ex.responsibility_set.create(ammount=1000, owner=o1)
ex.responsibility_set.create(ammount=1000, owner=o2)
payments = calculate_interpayments()
self.assertEquals(len(payments), 1)
self.assertEquals(payments[0], (o1, o2, 400))
Interpayment.objects.create(date=date(2011, 11, 13),
by=o1,
to=o2,
ammount=300)
payments = calculate_interpayments()
self.assertEquals(len(payments), 1)
self.assertEquals(payments[0], (o1, o2, 100))
Interpayment.objects.create(date=date(2011, 11, 13),
by=o1,
to=o2,
ammount=100)
payments = calculate_interpayments()
self.assertEquals(len(payments), 0)
def test_two_payments_involved(self):
o1 = Person.objects.create(name=u'Owner 1', owner=True)
o2 = Person.objects.create(name=u'Owner 2', owner=True)
p1 = Person.objects.create(name=u'Pilot')
ex = Expense.objects.create(date=date(2011, 11, 12))
ex.payment_set.create(ammount=900, paid_by=o1)
ex.payment_set.create(ammount=100, paid_by=o2)
ex.responsibility_set.create(ammount=300, owner=o1)
ex.responsibility_set.create(ammount=700, owner=o2)
ex = Expense.objects.create(date=date(2011, 11, 12))
ex.payment_set.create(ammount=100, paid_by=p1)
ex.responsibility_set.create(ammount=50, owner=o1)
ex.responsibility_set.create(ammount=50, owner=o2)
payments = calculate_interpayments()
self.assertEquals(len(payments), 2)
self.assertTrue((o2, o1, 550) in payments)
self.assertTrue((o2, p1, 100) in payments)
# pilot is paid by o1 instead of 02
Interpayment.objects.create(date=date(2011, 11, 13), by=o1, to=p1, ammount=100)
payments = calculate_interpayments()
self.assertEquals(len(payments), 1)
self.assertEquals(payments[0], (o2, o1, 650))
Interpayment.objects.create(date=date(2011, 11, 13), by=o2, to=o1, ammount=650)
payments = calculate_interpayments()
self.assertEquals(len(payments), 0)
def test_two_payments_involved(self):
o1 = Person.objects.create(name=u'Owner 1', owner=True)
o2 = Person.objects.create(name=u'Owner 2', owner=True)
ex = Expense.objects.create(date=date(2011, 11, 12))
ex.payment_set.create(ammount=900, paid_by=o1)
ex.payment_set.create(ammount=100, paid_by=o2)
ex.responsibility_set.create(ammount=300, owner=o1)
ex.responsibility_set.create(ammount=700, owner=o2)
ex = Expense.objects.create(date=date(2011, 11, 12))
ex.payment_set.create(ammount=2000, paid_by=o2)
ex.responsibility_set.create(ammount=1000, owner=o1)
ex.responsibility_set.create(ammount=1000, owner=o2)
payments = calculate_interpayments()
self.assertEquals(len(payments), 1)
self.assertEquals(payments[0], (o1, o2, 400))
Interpayment.objects.create(date=date(2011, 11, 13), by=o1, to=o2, ammount=300)
payments = calculate_interpayments()
self.assertEquals(len(payments), 1)
self.assertEquals(payments[0], (o1, o2, 100))
Interpayment.objects.create(date=date(2011, 11, 13), by=o1, to=o2, ammount=100)
payments = calculate_interpayments()
self.assertEquals(len(payments), 0)
def test_cents_and_float_precision(self):
o1 = Person.objects.create(name=u'Owner 1', owner=True)
o2 = Person.objects.create(name=u'Owner 2', owner=True)
p1 = Person.objects.create(name=u'Pilot')
ex = Expense.objects.create(date=date(2011, 11, 12))
ex.payment_set.create(ammount=900, paid_by=o1)
ex.payment_set.create(ammount=100, paid_by=o2)
ex.responsibility_set.create(ammount=300, owner=o1)
ex.responsibility_set.create(ammount=700, owner=o2)
ex = Expense.objects.create(date=date(2011, 11, 12))
ex.payment_set.create(ammount=100.01, paid_by=p1)
ex.responsibility_set.create(ammount=50, owner=o1)
ex.responsibility_set.create(ammount=50.01, owner=o2)
payments = calculate_interpayments()
self.assertEquals(len(payments), 2)
self.assertTrue((o2, o1, 550) in payments)
self.assertTrue((o2, p1, 100.01) in payments)
# pilot is paid by o1 instead of 02
Interpayment.objects.create(date=date(2011, 11, 13),
by=o1,
to=p1,
ammount=100)
payments = calculate_interpayments()
self.assertEquals(len(payments), 2)
self.assertTrue((o2, o1, 650) in payments)
self.assertTrue((o2, p1, .01) in payments)
Interpayment.objects.create(date=date(2011, 11, 13),
by=o2,
to=o1,
ammount=650)
Interpayment.objects.create(date=date(2011, 11, 13),
by=o2,
to=p1,
ammount=.01)
payments = calculate_interpayments()
self.assertEquals(len(payments), 0)
def test_one_owes_all_to_other(self):
o1 = Person.objects.create(name=u'Owner 1', owner=True)
o2 = Person.objects.create(name=u'Owner 2', owner=True)
ex = Expense.objects.create(date=date(2011, 11, 13))
ex.payment_set.create(ammount=1000, paid_by=o2)
ex.responsibility_set.create(ammount=1000, owner=o1)
payments = calculate_interpayments()
self.assertEquals(len(payments), 1)
self.assertEquals(payments[0], (o1, o2, 1000))
def test_no_interpayments_are_required_when_there_are_no_debts(self):
o1 = Person.objects.create(name=u'Owner 1', owner=True)
o2 = Person.objects.create(name=u'Owner 2', owner=True)
ex = Expense.objects.create(date=date(2011, 11, 13))
ex.payment_set.create(ammount=500, paid_by=o1)
ex.payment_set.create(ammount=500, paid_by=o2)
ex.responsibility_set.create(ammount=500, owner=o1)
ex.responsibility_set.create(ammount=500, owner=o2)
self.assertEquals(len(calculate_interpayments()), 0)
def test_one_owes_all_to_other(self):
o1 = Person.objects.create(name=u'Owner 1', owner=True)
o2 = Person.objects.create(name=u'Owner 2', owner=True)
ex = Expense.objects.create(date=date(2011, 11, 13))
ex.payment_set.create(ammount=1000, paid_by=o2)
ex.responsibility_set.create(ammount=1000, owner=o1)
payments = calculate_interpayments()
self.assertEquals(len(payments), 1)
self.assertEquals(payments[0], (o1, o2, 1000))
def test_no_interpayments_are_required_when_there_are_no_debts(self):
o1 = Person.objects.create(name=u'Owner 1', owner=True)
o2 = Person.objects.create(name=u'Owner 2', owner=True)
ex = Expense.objects.create(date=date(2011, 11, 13))
ex.payment_set.create(ammount=500, paid_by=o1)
ex.payment_set.create(ammount=500, paid_by=o2)
ex.responsibility_set.create(ammount=500, owner=o1)
ex.responsibility_set.create(ammount=500, owner=o2)
self.assertEquals(len(calculate_interpayments()), 0)
def test_mixed_still_one_payment(self):
o1 = Person.objects.create(name=u'Owner 1', owner=True)
o2 = Person.objects.create(name=u'Owner 2', owner=True)
ex = Expense.objects.create(date=date(2011, 11, 13))
ex.payment_set.create(ammount=900, paid_by=o1)
ex.payment_set.create(ammount=100, paid_by=o2)
ex.responsibility_set.create(ammount=300, owner=o1)
ex.responsibility_set.create(ammount=700, owner=o2)
payments = calculate_interpayments()
self.assertEquals(len(payments), 1)
self.assertEquals(payments[0], (o2, o1, 600))
def test_mixed_still_one_payment(self):
o1 = Person.objects.create(name=u'Owner 1', owner=True)
o2 = Person.objects.create(name=u'Owner 2', owner=True)
ex = Expense.objects.create(date=date(2011, 11, 13))
ex.payment_set.create(ammount=900, paid_by=o1)
ex.payment_set.create(ammount=100, paid_by=o2)
ex.responsibility_set.create(ammount=300, owner=o1)
ex.responsibility_set.create(ammount=700, owner=o2)
payments = calculate_interpayments()
self.assertEquals(len(payments), 1)
self.assertEquals(payments[0], (o2, o1, 600))
def test_previous_interpayments_are_considered_in_calculation(self):
o1 = Person.objects.create(name=u'Owner 1', owner=True)
o2 = Person.objects.create(name=u'Owner 2', owner=True)
ex = Expense.objects.create(date=date(2011, 11, 12))
ex.payment_set.create(ammount=900, paid_by=o1)
ex.payment_set.create(ammount=100, paid_by=o2)
ex.responsibility_set.create(ammount=300, owner=o1)
ex.responsibility_set.create(ammount=700, owner=o2)
Interpayment.objects.create(date=date(2011, 11, 13), by=o2, to=o1, ammount=300)
payments = calculate_interpayments()
self.assertEquals(len(payments), 1)
self.assertEquals(payments[0], (o2, o1, 300))
def test_previous_interpayments_are_considered_in_calculation(self):
o1 = Person.objects.create(name=u'Owner 1', owner=True)
o2 = Person.objects.create(name=u'Owner 2', owner=True)
ex = Expense.objects.create(date=date(2011, 11, 12))
ex.payment_set.create(ammount=900, paid_by=o1)
ex.payment_set.create(ammount=100, paid_by=o2)
ex.responsibility_set.create(ammount=300, owner=o1)
ex.responsibility_set.create(ammount=700, owner=o2)
Interpayment.objects.create(date=date(2011, 11, 13),
by=o2,
to=o1,
ammount=300)
payments = calculate_interpayments()
self.assertEquals(len(payments), 1)
self.assertEquals(payments[0], (o2, o1, 300))
