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secret_santa_test.py
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secret_santa_test.py
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#!/usr/bin/env python
# pylint: disable=C0103,W0621
"""Tests for a simple gift exchange."""
import pytest
from secret_santa import GiftExchange
@pytest.fixture()
def gift_exchange():
"""Initialize a GiftExchange object as a convenience."""
gift_exchange = GiftExchange()
return gift_exchange
def test_ExceptionWithDuplicateAttendeeName(gift_exchange):
"""Test for a duplicated attendee name."""
with pytest.raises(GiftExchange.DuplicateAttendeeException) as exc_info:
gift_exchange.add_attendee("Fred")
gift_exchange.add_attendee("Fred")
assert exc_info.value.args[0] == "Fred"
def test_ExceptionWithPartnerAsDuplicatedAttendee(gift_exchange):
"""Test for a duplicated partner."""
with pytest.raises(GiftExchange.DuplicatePartnerException) as exc_info:
gift_exchange.add_partnership("Fred", "Fred")
assert exc_info.value.args[0] == "partner"
def test_ExceptionWithDuplicatedAttendee(gift_exchange):
"""Test for an attendee with more than one partner."""
with pytest.raises(GiftExchange.DuplicatePartnerException) as exc_info:
gift_exchange.add_partnership("Fred", "Wilma")
gift_exchange.add_partnership("Fred", "Betty")
assert exc_info.value.args[0] == "attendee"
assert exc_info.value.args[1] == "Fred"
def test_ExceptionWithDuplicatedPartner(gift_exchange):
"""Test for a duplicated partner."""
with pytest.raises(GiftExchange.DuplicateAttendeeException) as exc_info:
gift_exchange.add_partnership("Fred", "Wilma")
gift_exchange.add_partnership("Barney", "Wilma")
assert exc_info.value.args[0] == "Wilma"
def test_canAddAttendees(gift_exchange):
"""Test that it is possible to add attendees."""
gift_exchange.add_attendee("Fred")
gift_exchange.add_partnership("Fred", "Wilma")
gift_exchange.add_attendee("Barney")
gift_exchange.add_partnership("Barney", "Betty")
gift_exchange.add_attendee("Pebbles")
gift_exchange.add_attendee("Bambam")
assert gift_exchange.get_attendee_count() == 6
assert gift_exchange.get_partnership_count() == 2
def test_getUnmatchedAttendeesCount(gift_exchange):
"""Test for the correct attendee count."""
gift_exchange.add_attendee("Fred")
gift_exchange.add_partnership("Fred", "Wilma")
assert gift_exchange.get_unmatched_attendees_count() == 2
def test_checkForValidGiver(gift_exchange):
"""Check than an attendee is rejected as a donor for their partner."""
gift_exchange.add_attendee("Fred")
gift_exchange.add_partnership("Fred", "Wilma")
assert not gift_exchange.check_for_valid_giver(["Fred", "Wilma"], 0, 1)
def test_NoValidSolution1(gift_exchange):
"""Test that an unsolvable gathering raises an exception."""
gift_exchange.add_attendee("Fred")
with pytest.raises(GiftExchange.NoSolutionPossibleException) as exc_info:
gift_exchange.check_for_valid_solution()
assert exc_info.value.args[0] == "Not enough attendees for a solution!"
def test_NoValidSolution2(gift_exchange):
"""Test that an unsolvable gathering raises an exception."""
gift_exchange.add_attendee("Fred")
gift_exchange.add_partnership("Fred", "Wilma")
with pytest.raises(GiftExchange.NoSolutionPossibleException) as exc_info:
gift_exchange.check_for_valid_solution()
assert (exc_info.value.args[0] ==
"Not enough unpartnered attendees for a solution!")
def test_NoValidSolution3(gift_exchange):
"""Test that an unsolvable gathering raises an exception."""
gift_exchange.add_attendee("Fred")
gift_exchange.add_partnership("Fred", "Wilma")
gift_exchange.add_attendee("Pebbles")
with pytest.raises(GiftExchange.NoSolutionPossibleException) as exc_info:
gift_exchange.check_for_valid_solution()
assert (exc_info.value.args[0] ==
"Not enough unpartnered attendees for a solution!")
def test_canShuffleAttendees(gift_exchange):
"""Test to see that the attendees can be shuffled."""
gift_exchange.add_attendee("Fred")
gift_exchange.add_partnership("Fred", "Wilma")
gift_exchange.add_attendee("Barney")
gift_exchange.add_partnership("Barney", "Betty")
gift_exchange.add_attendee("Pebbles")
gift_exchange.add_attendee("Bambam")
items = gift_exchange.shuffle_attendees()
assert len(items) == 6
def test_resetUnmatchedAttendeesCount(gift_exchange):
"""Test to see that the unmatched attendee count is reset correctly."""
gift_exchange.add_attendee("Ren")
gift_exchange.add_attendee("Stimpy")
gift_exchange.match_attendees(gift_exchange.shuffle_attendees())
assert gift_exchange.get_unmatched_attendees_count() == 0
gift_exchange.reset_unmatched_attendees_count()
assert gift_exchange.get_unmatched_attendees_count() == 2
def test_canSolveGoodSolution1(gift_exchange):
"""Test to see that a circular exchange can be solved."""
gift_exchange.add_attendee("Ren")
gift_exchange.add_attendee("Stimpy")
gift_exchange.match_attendees(gift_exchange.shuffle_attendees())
assert gift_exchange.get_unmatched_attendees_count() == 0
def test_canSolveGoodSolution2(gift_exchange):
"""Test to see that a completely solvable exchange can be solved."""
gift_exchange.add_attendee("Larry")
gift_exchange.add_attendee("Curly")
gift_exchange.add_attendee("Moe")
gift_exchange.match_attendees(gift_exchange.shuffle_attendees())
assert gift_exchange.get_unmatched_attendees_count() == 0
# Certain orders of the Flintstones are solvable,
# but others are not. We will check both.
def test_canSolveFlintstones1(gift_exchange):
"""Test that a solvable arrangement gets solved."""
gift_exchange.add_attendee("Fred")
gift_exchange.add_partnership("Fred", "Wilma")
gift_exchange.add_attendee("Barney")
gift_exchange.add_partnership("Barney", "Betty")
gift_exchange.add_attendee("Pebbles")
gift_exchange.add_attendee("Bambam")
solvable_arr = ['Barney', 'Wilma', 'Bambam', 'Betty', 'Fred', 'Pebbles']
gift_exchange.match_attendees(solvable_arr)
assert gift_exchange.get_unmatched_attendees_count() == 0
def test_canSolveFlintstones2(gift_exchange):
"""Test that a solvable arrangement gets solved."""
gift_exchange.add_attendee("Fred")
gift_exchange.add_partnership("Fred", "Wilma")
gift_exchange.add_attendee("Barney")
gift_exchange.add_partnership("Barney", "Betty")
gift_exchange.add_attendee("Pebbles")
gift_exchange.add_attendee("Bambam")
solvable_arr = ['Wilma', 'Bambam', 'Betty', 'Fred', 'Pebbles', 'Barney']
gift_exchange.match_attendees(solvable_arr)
assert gift_exchange.get_unmatched_attendees_count() == 0
def test_cannotSolveFlintstones1(gift_exchange):
"""Test that an unsolvable arrangement raises an exception."""
gift_exchange.add_attendee("Fred")
gift_exchange.add_partnership("Fred", "Wilma")
gift_exchange.add_attendee("Barney")
gift_exchange.add_partnership("Barney", "Betty")
gift_exchange.add_attendee("Pebbles")
gift_exchange.add_attendee("Bambam")
unsolvable_arr = ['Barney', 'Pebbles', 'Bambam', 'Betty', 'Fred', 'Wilma']
with pytest.raises(gift_exchange.SolutionNotFoundException):
gift_exchange.match_attendees(unsolvable_arr)
def test_cannotSolveFlintstones2(gift_exchange):
"""Test that an unsolvable arrangement raises an exception."""
gift_exchange.add_attendee("Fred")
gift_exchange.add_partnership("Fred", "Wilma")
gift_exchange.add_attendee("Barney")
gift_exchange.add_partnership("Barney", "Betty")
gift_exchange.add_attendee("Pebbles")
gift_exchange.add_attendee("Bambam")
unsolvable_arr = ['Wilma', 'Barney', 'Bambam', 'Betty', 'Pebbles', 'Fred']
with pytest.raises(gift_exchange.SolutionNotFoundException):
gift_exchange.match_attendees(unsolvable_arr)
# Now run some benchmarks for historical comparison purposes.
def test_canSolveBenchmark1(benchmark):
"""Benchmark a solvable arrangement getting solved."""
ge = GiftExchange()
ge.add_attendee("Fred")
ge.add_partnership("Fred", "Wilma")
ge.add_attendee("Barney")
ge.add_partnership("Barney", "Betty")
ge.add_attendee("Pebbles")
ge.add_attendee("Bambam")
solvable_arr = ['Barney', 'Wilma', 'Bambam', 'Betty', 'Fred', 'Pebbles']
benchmark(ge.match_attendees, solvable_arr)
assert ge.get_unmatched_attendees_count() == 0
def test_canSolveBenchmark2(benchmark):
"""Benchmark a solvable arrangement getting solved."""
ge = GiftExchange()
ge.add_attendee("Fred")
ge.add_partnership("Fred", "Wilma")
ge.add_attendee("Barney")
ge.add_partnership("Barney", "Betty")
ge.add_attendee("Pebbles")
ge.add_attendee("Bambam")
solvable_arr = ['Wilma', 'Bambam', 'Betty', 'Fred', 'Pebbles', 'Barney']
benchmark(ge.match_attendees, solvable_arr)
assert ge.get_unmatched_attendees_count() == 0