python-future/tests/test_future/test_object.py at master · Python-Repository-Hub/python-future · GitHub

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"""

Tests to make sure the newobject object (which defines Python 2-compatible

``__unicode__`` and ``next`` methods) is working.

"""

from __future__ import absolute_import, division

from future import utils

from future.builtins import object, str, next, int, super

from future.utils import implements_iterator, python_2_unicode_compatible

from future.tests.base import unittest, expectedFailurePY2

class TestNewObject(unittest.TestCase):

def test_object_implements_py2_unicode_method(self):

my_unicode_str = u'Unicode string: \u5b54\u5b50'

class A(object):

def __str__(self):

return my_unicode_str

a = A()

self.assertEqual(len(str(a)), 18)

if utils.PY2:

self.assertTrue(hasattr(a, '__unicode__'))

else:

self.assertFalse(hasattr(a, '__unicode__'))

self.assertEqual(str(a), my_unicode_str)

self.assertTrue(isinstance(str(a).encode('utf-8'), bytes))

if utils.PY2:

self.assertTrue(type(unicode(a)) == unicode)

self.assertEqual(unicode(a), my_unicode_str)

# Manual equivalent on Py2 without the decorator:

if not utils.PY3:

class B(object):

def __unicode__(self):

return u'Unicode string: \u5b54\u5b50'

def __str__(self):

return unicode(self).encode('utf-8')

b = B()

assert str(a) == str(b)

def test_implements_py2_iterator(self):

class Upper(object):

def __init__(self, iterable):

self._iter = iter(iterable)

def __next__(self): # note the Py3 interface

return next(self._iter).upper()

def __iter__(self):

return self

self.assertEqual(list(Upper('hello')), list('HELLO'))

# Try combining it with the next() function:

class MyIter(object):

def __next__(self):

return 'Next!'

def __iter__(self):

return self

itr = MyIter()

self.assertEqual(next(itr), 'Next!')

itr2 = MyIter()

for i, item in enumerate(itr2):

if i >= 10:

break

self.assertEqual(item, 'Next!')

def test_implements_py2_nonzero(self):

class EvenIsTrue(object):

"""

An integer that evaluates to True if even.

"""

def __init__(self, my_int):

self.my_int = my_int

def __bool__(self):

return self.my_int % 2 == 0

def __add__(self, other):

return type(self)(self.my_int + other)

k = EvenIsTrue(5)

self.assertFalse(k)

self.assertFalse(bool(k))

self.assertTrue(k + 1)

self.assertTrue(bool(k + 1))

self.assertFalse(k + 2)

def test_int_implements_py2_nonzero(self):

"""

Tests whether the newint object provides a __nonzero__ method that

maps to __bool__ in case the user redefines __bool__ in a subclass of

newint.

"""

class EvenIsTrue(int):

"""

An integer that evaluates to True if even.

"""

def __bool__(self):

return self % 2 == 0

def __add__(self, other):

val = super().__add__(other)

return type(self)(val)

k = EvenIsTrue(5)

self.assertFalse(k)

self.assertFalse(bool(k))

self.assertTrue(k + 1)

self.assertTrue(bool(k + 1))

self.assertFalse(k + 2)

def test_non_iterator(self):

"""

The default behaviour of next(o) for a newobject o should be to raise a

TypeError, as with the corresponding builtin object.

"""

o = object()

with self.assertRaises(TypeError):

next(o)

def test_bool_empty_object(self):

"""

The default result of bool(newobject()) should be True, as with builtin

objects.

"""

o = object()

self.assertTrue(bool(o))

class MyClass(object):

pass

obj = MyClass()

self.assertTrue(bool(obj))

def test_isinstance_object_subclass(self):

"""

This was failing before

"""

class A(object):

pass

a = A()

class B(object):

pass

b = B()

self.assertFalse(isinstance(a, B))

self.assertFalse(isinstance(b, A))

self.assertTrue(isinstance(a, A))

self.assertTrue(isinstance(b, B))

class C(A):

pass

c = C()

self.assertTrue(isinstance(c, A))

self.assertFalse(isinstance(c, B))

self.assertFalse(isinstance(a, C))

self.assertFalse(isinstance(b, C))

self.assertTrue(isinstance(c, C))

@expectedFailurePY2

def test_types_isinstance_newobject(self):

a = list()

b = dict()

c = set()

self.assertTrue(isinstance(a, object))

self.assertTrue(isinstance(b, object))

self.assertTrue(isinstance(c, object))

# Old-style class instances on Py2 should still report as an instance

# of object as usual on Py2:

class D:

pass

d = D()

self.assertTrue(isinstance(d, object))

e = object()

self.assertTrue(isinstance(e, object))

class F(object):

pass

f = F()

self.assertTrue(isinstance(f, object))

class G(F):

pass

g = G()

self.assertTrue(isinstance(g, object))

class H():

pass

h = H()

self.assertTrue(isinstance(h, object))

def test_long_special_method(self):

class A(object):

def __int__(self):

return 0

a = A()

self.assertEqual(int(a), 0)

if utils.PY2:

self.assertEqual(long(a), 0)

def test_multiple_inheritance(self):

"""

Issue #96

"""

if utils.PY2:

from collections import Container

else:

from collections.abc import Container

class Base(object):

pass

class Foo(Base, Container):

def __contains__(self, item):

return False

def test_with_metaclass_and_object(self):

"""

Issue #91

"""

from future.utils import with_metaclass

class MetaClass(type):

pass

class TestClass(with_metaclass(MetaClass, object)):

pass

def test_bool(self):

"""

Issue #211

"""

from builtins import object

class ResultSet(object):

def __len__(self):

return 0

self.assertTrue(bool(ResultSet()) is False)

class ResultSet(object):

def __len__(self):

return 2

self.assertTrue(bool(ResultSet()) is True)

def test_bool2(self):

"""

If __bool__ is defined, the presence or absence of __len__ should

be irrelevant.

"""

from builtins import object

class TrueThing(object):

def __bool__(self):

return True

def __len__(self):

raise RuntimeError('__len__ should not be called')

self.assertTrue(bool(TrueThing()))

class FalseThing(object):

def __bool__(self):

return False

def __len__(self):

raise RuntimeError('__len__ should not be called')

self.assertFalse(bool(FalseThing()))

def test_cannot_assign_new_attributes_to_object(self):

"""

New attributes cannot be assigned to object() instances in Python.

The same should apply to newobject.

"""

from builtins import object

with self.assertRaises(AttributeError):

object().arbitrary_attribute_name = True

if __name__ == '__main__':

unittest.main()

python-future/tests/test_future/test_object.py at master · Python-Repository-Hub/python-future · GitHub

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