def setUp(self):
self.u = model.User(u'chaz', u'Charles Root', False)
self.e = model.Expenditure(self.u, Currency('444.88'),
u'chaz buys lunch')
meta.Session.add(self.u)
meta.Session.add(self.e)
meta.Session.commit()
def test_simpleSplit(self):
"""
Test simply splitting a $100 expenditure amongst 4 people
"""
createUsers(4)
e = model.Expenditure(
meta.Session.query(model.User).first(), Currency("100"))
meta.Session.add(e)
e.even_split()
meta.Session.commit()
for s in meta.Session.query(model.Split).\
filter(model.Split.expenditure==e):
self.assertEqual(s.share, Currency("25.00"))
deleteExpenditures()
deleteUsers()
def test_index_description_blank_oops(self):
response = self.app.get(url_for(controller='spend',
action='index'))
# Test response...
response.mustcontain('Add a New Expenditure')
form = response.form
user = meta.Session.query(model.User).\
filter_by(name=u'Charlie Root').one()
form['spender_id'] = user.id
form['amount'] = '74.04'
# Make sure date is today.
today = date.today()
assert form['date'].value == today.strftime('%m/%d/%Y')
form['description'] = ''
for ii in range(4):
if int(form['shares-%d.user_id' % ii].value) in (1, 4):
form['shares-%d.amount' % ii] = '1'
else:
form['shares-%d.amount' % ii] = '2'
response = form.submit()
response.mustcontain('<!-- for: description -->', 'Please enter a value')
form = response.form
form['description'] = 'Another test'
response = form.submit()
response = response.follow()
e = meta.Session.query(model.Expenditure).\
order_by(model.Expenditure.id.desc()).first()
assert e.spender.name == u'Charlie Root'
assert e.amount == 7404
assert e.date == today
assert e.description == u'Another test'
# Test the split.
shares = dict(((sp.user_id, sp.share)
for sp in e.splits))
assert shares[1] == Currency('12.34')
assert shares[2] == Currency('24.68')
assert shares[3] == Currency('24.68')
assert shares[4] == Currency('12.34')
def createExpenditures(n=None):
if n is None:
n = random.randint(5, 20)
users = meta.Session.query(bluechips.model.User).all()
for i in xrange(n):
e = bluechips.model.Expenditure(random.choice(users),
Currency(random.randint(1000, 100000)))
meta.Session.add(e)
e.even_split()
meta.Session.commit()
def __init__(self,
spender=None,
amount=Currency(0),
description=u"",
date=None):
self.spender = spender
self.amount = amount
self.description = description
if self.date == None:
self.date = datetime.now()
def split(self, split_dict):
"""
Split up an expenditure.
split_dict should be a dict mapping from bluechips.model:User
objects to a decimal:Decimal object representing the percentage
that user is responsible for.
Percentages will be normalized to sum to 100%.
If the split leaks or gains money due to rounding errors, the
pennies will be randomly distributed to a subset of the users.
I mean, come on. You're already living together. Are you really
going to squabble over a few pennies?
"""
map(meta.Session.delete, meta.Session.query(Split).\
filter_by(expenditure_id=self.id))
total = sum(split_dict.itervalues())
for user, share in split_dict.items():
if share == 0:
del split_dict[user]
amounts_dict = dict()
for user, share in split_dict.iteritems():
amounts_dict[user] = Currency((share * self.amount) / total)
difference = self.amount - sum(amounts_dict.itervalues())
winners = random.sample(amounts_dict.keys(), abs(int(difference)))
for winner in winners:
amounts_dict[winner] += Currency(
1) if difference > 0 else Currency(-1)
for user, share in amounts_dict.iteritems():
s = Split(self, user, share)
meta.Session.add(s)
def test_uneven(self):
"""
Test that expenditures can be split non-evenly
"""
createUsers(2)
users = meta.Session.query(model.User).all()
e = model.Expenditure(users[0], Currency("100"))
meta.Session.add(e)
split_dict = {users[0]: Decimal("20"), users[1]: Decimal("80")}
amount_dict = {users[0]: Currency("20"), users[1]: Currency("80")}
e.split(split_dict)
meta.Session.commit()
for s in meta.Session.query(model.Split):
self.assertEqual(s.share, amount_dict[s.user])
deleteExpenditures()
deleteUsers()
def test_sevenPeople(self):
"""
Test that expenses are split as evenly as possible with lots of people
"""
createUsers(7)
users = meta.Session.query(model.User).all()
e = model.Expenditure(users[0], Currency("24.00"))
meta.Session.add(e)
e.even_split()
meta.Session.commit()
splits = meta.Session.query(model.Split).all()
self.assertEqual(e.amount, sum(s.share for s in splits))
max_split = max(s.share for s in splits)
min_split = min(s.share for s in splits)
self.assertTrue(max_split - min_split <= Currency(1))
deleteExpenditures()
deleteUsers()
def share_name(self):
"Return the share name that matches the splitting"
shares = dict((split.user, split.share) for split in self.splits
if split.share != 0)
if len(shares) == 1:
user = shares.keys()[0]
return 'For %s' % user.name
for oname, oshares in share_dict.items():
ratio = float(self.amount) * 1. / sum(oshares.values())
difference = sum(
abs(shares[u] - oshares.get(u.username, 0) * ratio)
for u in shares)
if difference <= Currency(len(shares)):
return oname
def test_unevenBadTotal(self):
"""
Test that transactions get split up properly when the uneven
split shares don't add to 100%
"""
createUsers(2)
users = meta.Session.query(model.User).all()
e = model.Expenditure(users[0], Currency("100.00"))
meta.Session.add(e)
split_dict = {users[0]: Decimal(10), users[1]: Decimal(15)}
amount_dict = {users[0]: Currency("40"), users[1]: Currency("60")}
e.split(split_dict)
meta.Session.commit()
for s in meta.Session.query(model.Split):
self.assertEqual(s.share, amount_dict[s.user])
deleteExpenditures()
deleteUsers()
def debts():
# In this scheme, negative numbers represent money the house owes
# the user, and positive numbers represent money the user owes the
# house
users = meta.Session.query(model.User)
debts_dict = dict((u, Currency(0)) for u in users)
# First, credit everyone for expenditures they've made
total_expenditures = meta.Session.query(model.Expenditure).\
add_column(sqlalchemy.func.sum(model.Expenditure.amount).label('total_spend')).\
group_by(model.Expenditure.spender_id)
for expenditure, total_spend in total_expenditures:
debts_dict[expenditure.spender] -= total_spend
# Next, debit everyone for expenditures that they have an
# investment in (i.e. splits)
total_splits = meta.Session.query(model.Split).\
add_column(sqlalchemy.func.sum(model.Split.share).label('total_split')).\
group_by(model.Split.user_id)
for split, total_cents in total_splits:
debts_dict[split.user] += total_cents
# Finally, move transfers around appropriately
#
# To keep this from getting to be expensive, have SQL sum up
# transfers for us
transfer_q = meta.Session.query(model.Transfer).\
add_column(sqlalchemy.func.sum(model.Transfer.amount).label('total_amount'))
total_debits = transfer_q.group_by(model.Transfer.debtor_id)
total_credits = transfer_q.group_by(model.Transfer.creditor_id)
for transfer, total_amount in total_debits:
debts_dict[transfer.debtor] -= total_amount
for transfer, total_amount in total_credits:
debts_dict[transfer.creditor] += total_amount
return debts_dict
def test_negativeExpenditure(self):
"""
Test that negative expenditures get split correctly
"""
createUsers(2)
users = meta.Session.query(model.User).all()
e = model.Expenditure(users[0], Currency("100.00"))
meta.Session.add(e)
# Force a split that will result in needing to distribute
# pennies
split_dict = {users[0]: Decimal(1), users[1]: Decimal(2)}
e.split(split_dict)
meta.Session.commit()
self.assertEqual(e.amount,
sum(s.share for s in meta.Session.query(model.Split)))
deleteExpenditures()
deleteUsers()
def share(self, user):
"Return the share corresponding to ``user``."
shares = dict((split.user, split.share) for split in self.splits)
return shares.get(user, Currency(0))
def test_split_small_negative(self):
self._two_way_split_test(Currency('-0.01'), Currency('-0.01'),
Currency('-0.00'))
def test_even_split(self):
self.e.even_split()
meta.Session.commit()
for sp in self.e.splits:
assert sp.share == Currency('111.22')
def setUp(self):
self.u = model.User('chaz', u'Charles Root', False)
self.e = model.Expenditure(self.u, Currency('12.34'),
u'A test expenditure')
self.sp = model.Split(self.e, self.u, Currency('5.55'))
def test_constructor(self):
assert self.sp.expenditure == self.e
assert self.sp.user == self.u
assert self.sp.share == Currency('5.55')
def test_split_rounds_up(self):
self._two_way_split_test(Currency('39.99'), Currency('19.99'),
Currency('20.00'))
def test_split_rounds_down(self):
self._two_way_split_test(Currency('40.01'), Currency('20.00'),
Currency('20.01'))
def test_constructor(self):
assert self.e.spender == self.u
assert self.e.amount == Currency('444.88')
assert self.e.description == u'chaz buys lunch'
def test_split_small(self):
self._two_way_split_test(Currency('0.01'), Currency('0.00'),
Currency('0.01'))
