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# -*- coding: utf-8 -*-
"""
Tests for the backported class:`dict` class.
"""
from __future__ import absolute_import, unicode_literals, print_function
from future.builtins import *
from future import utils
from future.tests.base import unittest, expectedFailurePY2
import os
import sys
class TestDict(unittest.TestCase):
def setUp(self):
self.d1 = {'C': 1, 'B': 2, 'A': 3}
self.d2 = dict(key1='value1', key2='value2')
def test_dict_empty(self):
"""
dict() -> {}
"""
self.assertEqual(dict(), {})
def test_dict_dict(self):
"""
Exrapolated from issue #50 -- newlist(newlist([...]))
"""
d = dict({1: 2, 2: 4, 3: 9})
d2 = dict(d)
self.assertEqual(len(d2), 3)
self.assertEqual(d2, d)
self.assertTrue(isinstance(d2, dict))
self.assertTrue(type(d2) == dict)
def test_dict_eq(self):
d = self.d1
self.assertEqual(dict(d), d)
def test_dict_keys(self):
"""
The keys, values and items methods should now return iterators on
Python 2.x (with set-like behaviour on Python 2.7).
"""
d = self.d1
self.assertEqual(set(dict(d)), set(d))
self.assertEqual(set(dict(d).keys()), set(d.keys()))
with self.assertRaises(TypeError):
dict(d).keys()[0]
def test_dict_values(self):
d = self.d1
self.assertEqual(set(dict(d).values()), set(d.values()))
with self.assertRaises(TypeError):
dict(d).values()[0]
def test_dict_items(self):
d = self.d1
self.assertEqual(set(dict(d).items()), set(d.items()))
with self.assertRaises(TypeError):
dict(d).items()[0]
def test_isinstance_dict(self):
d = self.d1
self.assertTrue(isinstance(d, dict))
def test_isinstance_dict_subclass(self):
"""
Issue #89
"""
value = dict()
class Magic(dict):
pass
self.assertTrue(isinstance(value, dict))
self.assertFalse(isinstance(value, Magic))
def test_dict_getitem(self):
d = dict({'C': 1, 'B': 2, 'A': 3})
self.assertEqual(d['C'], 1)
self.assertEqual(d['B'], 2)
self.assertEqual(d['A'], 3)
with self.assertRaises(KeyError):
self.assertEqual(d['D'])
def test_methods_do_not_produce_lists(self):
for d in (dict(self.d1), self.d2):
assert not isinstance(d.keys(), list)
assert not isinstance(d.values(), list)
assert not isinstance(d.items(), list)
@unittest.skipIf(sys.version_info[:2] == (2, 6),
'set-like behaviour of dict methods is only available in Py2.7+')
def test_set_like_behaviour(self):
d1, d2 = self.d1, self.d2
assert d1.keys() & d2.keys() == set()
assert isinstance(d1.keys() & d2.keys(), set)
assert isinstance(d1.values() | d2.keys(), set)
assert isinstance(d1.items() | d2.items(), set)
@expectedFailurePY2
def test_braces_create_newdict_object(self):
"""
It would nice if the {} dict syntax could be coaxed
into producing our new dict objects somehow ...
"""
d = self.d1
self.assertTrue(type(d) == dict)
@expectedFailurePY2
def test_multiple_inheritance(self):
"""
Issue #96 (for newdict instead of newobject)
"""
if utils.PY2:
from collections import Container
else:
from collections.abc import Container
class Base(dict):
pass
class Foo(Base, Container):
def __contains__(self, item):
return False
@expectedFailurePY2
def test_with_metaclass_and_dict(self):
"""
Issue #91 (for newdict instead of newobject)
"""
from future.utils import with_metaclass
class MetaClass(type):
pass
class TestClass(with_metaclass(MetaClass, dict)):
pass
if __name__ == '__main__':
unittest.main()
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