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"""Wizard tests from petrounias.org
http://www.petrounias.org/articles/2014/09/16/pickling-python-collections-with-non-built-in-type-keys-and-cycles/
Includes functionality to assist with adding compatibility to jsonpickle.
"""
from __future__ import absolute_import, division, unicode_literals
import collections
import unittest
from jsonpickle import decode, encode
class World(object):
def __init__(self):
self.wizards = []
class Wizard(object):
def __init__(self, world, name):
self.name = name
self.spells = collections.OrderedDict()
world.wizards.append(self)
def __cmp__(self, other):
for (ka, va), (kb, vb) in zip(self.spells.items(), other.spells.items()):
cmp_name = cmp(ka.name, kb.name) # noqa: F821
if cmp_name != 0:
print('Wizards cmp: %s != %s' % (ka.name, kb.name))
return cmp_name
for sa, sb in zip(va, vb):
cmp_spell = cmp(sa, sb) # noqa: F821
if cmp_spell != 0:
print('Spells cmp: %s != %s' % (sa.name, sb.name))
return cmp_spell
return cmp(self.name, other.name) # noqa: F821
def __eq__(self, other):
for (ka, va), (kb, vb) in zip(self.spells.items(), other.spells.items()):
if ka.name != kb.name:
print('Wizards differ: %s != %s' % (ka.name, kb.name))
return False
for sa, sb in zip(va, vb):
if sa != sb:
print('Spells differ: %s != %s' % (sa.name, sb.name))
return False
return self.name == other.name
def __hash__(self):
return hash('Wizard %s' % self.name)
class Spell(object):
def __init__(self, caster, target, name):
self.caster = caster
self.target = target
self.name = name
try:
spells = caster.spells[target]
except KeyError:
spells = caster.spells[target] = []
spells.append(self)
def __cmp__(self, other):
return (
cmp(self.name, other.name) # noqa: F821
or cmp(self.caster.name, other.caster.name) # noqa: F821
or cmp(self.target.name, other.target.name) # noqa: F821
) # noqa: F821
def __eq__(self, other):
return (
self.name == other.name
and self.caster.name == other.caster.name
and self.target.name == other.target.name
)
def __hash__(self):
return hash(
'Spell %s by %s on %s' % (self.name, self.caster.name, self.target.name)
)
def hashsum(items):
return sum([hash(x) for x in items])
def compare_spells(a, b):
for (ka, va), (kb, vb) in zip(a.items(), b.items()):
if ka != kb:
print('Keys differ: %s != %s' % (ka, kb))
return False
return True
class MagicTestCase(unittest.TestCase):
def test_without_pickling(self):
world = World()
wizard_merlin = Wizard(world, 'Merlin')
wizard_morgana = Wizard(world, 'Morgana')
spell_a = Spell(wizard_merlin, wizard_morgana, 'magic-missile')
spell_b = Spell(wizard_merlin, wizard_merlin, 'stone-skin')
spell_c = Spell(wizard_morgana, wizard_merlin, 'geas')
self.assertEqual(wizard_merlin.spells[wizard_morgana][0], spell_a)
self.assertEqual(wizard_merlin.spells[wizard_merlin][0], spell_b)
self.assertEqual(wizard_morgana.spells[wizard_merlin][0], spell_c)
# Merlin has cast Magic Missile on Morgana, and Stone Skin on himself
self.assertEqual(wizard_merlin.spells[wizard_morgana][0].name, 'magic-missile')
self.assertEqual(wizard_merlin.spells[wizard_merlin][0].name, 'stone-skin')
# Morgana has cast Geas on Merlin
self.assertEqual(wizard_morgana.spells[wizard_merlin][0].name, 'geas')
# Merlin's first target was Morgana
merlin_spells = wizard_merlin.spells
merlin_spells_keys = list(merlin_spells.keys())
self.assertTrue(merlin_spells_keys[0] in wizard_merlin.spells)
self.assertEqual(merlin_spells_keys[0], wizard_morgana)
# Merlin's second target was himself
self.assertTrue(merlin_spells_keys[1] in wizard_merlin.spells)
self.assertEqual(merlin_spells_keys[1], wizard_merlin)
# Morgana's first target was Merlin
morgana_spells_keys = list(wizard_morgana.spells.keys())
self.assertTrue(morgana_spells_keys[0] in wizard_morgana.spells)
self.assertEqual(morgana_spells_keys[0], wizard_merlin)
# Merlin's first spell cast with himself as target is in the dictionary,
# first by looking up directly with Merlin's instance object...
self.assertEqual(wizard_merlin, wizard_merlin.spells[wizard_merlin][0].target)
# ...and then with the instance object directly from the dictionary keys
self.assertEqual(wizard_merlin, merlin_spells[merlin_spells_keys[1]][0].target)
# Ensure Merlin's object is unique...
self.assertEqual(id(wizard_merlin), id(merlin_spells_keys[1]))
# ...and consistently hashed
self.assertEqual(hash(wizard_merlin), hash(merlin_spells_keys[1]))
def test_with_pickling(self):
world = World()
wizard_merlin = Wizard(world, 'Merlin')
wizard_morgana = Wizard(world, 'Morgana')
wizard_morgana_prime = Wizard(world, 'Morgana')
self.assertEqual(wizard_morgana.__dict__, wizard_morgana_prime.__dict__)
spell_a = Spell(wizard_merlin, wizard_morgana, 'magic-missile')
spell_b = Spell(wizard_merlin, wizard_merlin, 'stone-skin')
spell_c = Spell(wizard_morgana, wizard_merlin, 'geas')
self.assertEqual(wizard_merlin.spells[wizard_morgana][0], spell_a)
self.assertEqual(wizard_merlin.spells[wizard_merlin][0], spell_b)
self.assertEqual(wizard_morgana.spells[wizard_merlin][0], spell_c)
flat_world = encode(world, keys=True)
u_world = decode(flat_world, keys=True)
u_wizard_merlin = u_world.wizards[0]
u_wizard_morgana = u_world.wizards[1]
morgana_spells_encoded = encode(wizard_morgana.spells, keys=True)
morgana_spells_decoded = decode(morgana_spells_encoded, keys=True)
self.assertEqual(wizard_morgana.spells, morgana_spells_decoded)
morgana_encoded = encode(wizard_morgana, keys=True)
morgana_decoded = decode(morgana_encoded, keys=True)
self.assertEqual(wizard_morgana, morgana_decoded)
self.assertEqual(hash(wizard_morgana), hash(morgana_decoded))
self.assertEqual(wizard_morgana.spells, morgana_decoded.spells)
# Merlin has cast Magic Missile on Morgana, and Stone Skin on himself
merlin_spells = u_wizard_merlin.spells
self.assertEqual(merlin_spells[u_wizard_morgana][0].name, 'magic-missile')
self.assertEqual(merlin_spells[u_wizard_merlin][0].name, 'stone-skin')
# Morgana has cast Geas on Merlin
self.assertEqual(u_wizard_morgana.spells[u_wizard_merlin][0].name, 'geas')
# Merlin's first target was Morgana
merlin_spells_keys = list(u_wizard_merlin.spells.keys())
self.assertTrue(merlin_spells_keys[0] in u_wizard_merlin.spells)
self.assertEqual(merlin_spells_keys[0], u_wizard_morgana)
# Merlin's second target was himself
self.assertTrue(merlin_spells_keys[1] in u_wizard_merlin.spells)
self.assertEqual(merlin_spells_keys[1], u_wizard_merlin)
# Morgana's first target was Merlin
morgana_spells_keys = list(u_wizard_morgana.spells.keys())
self.assertTrue(morgana_spells_keys[0] in u_wizard_morgana.spells)
self.assertEqual(morgana_spells_keys[0], u_wizard_merlin)
# Merlin's first spell cast with himself as target is in the dict.
# First try the lookup with Merlin's instance object
self.assertEqual(u_wizard_merlin, merlin_spells[u_wizard_merlin][0].target)
# Next try the lookup with the object from the dictionary keys.
self.assertEqual(
u_wizard_merlin, merlin_spells[merlin_spells_keys[1]][0].target
)
# Ensure Merlin's object is unique and consistently hashed.
self.assertEqual(id(u_wizard_merlin), id(merlin_spells_keys[1]))
self.assertEqual(hash(u_wizard_merlin), hash(merlin_spells_keys[1]))
if __name__ == '__main__':
unittest.main()
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