290 lines
7.9 KiB
Python
290 lines
7.9 KiB
Python
"""
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Tests to make sure the newobject object (which defines Python 2-compatible
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``__unicode__`` and ``next`` methods) is working.
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"""
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from __future__ import absolute_import, division
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from future import utils
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from future.builtins import object, str, next, int, super
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from future.utils import implements_iterator, python_2_unicode_compatible
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from future.tests.base import unittest, expectedFailurePY2
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class TestNewObject(unittest.TestCase):
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def test_object_implements_py2_unicode_method(self):
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my_unicode_str = u'Unicode string: \u5b54\u5b50'
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class A(object):
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def __str__(self):
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return my_unicode_str
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a = A()
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self.assertEqual(len(str(a)), 18)
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if utils.PY2:
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self.assertTrue(hasattr(a, '__unicode__'))
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else:
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self.assertFalse(hasattr(a, '__unicode__'))
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self.assertEqual(str(a), my_unicode_str)
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self.assertTrue(isinstance(str(a).encode('utf-8'), bytes))
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if utils.PY2:
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self.assertTrue(type(unicode(a)) == unicode)
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self.assertEqual(unicode(a), my_unicode_str)
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# Manual equivalent on Py2 without the decorator:
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if not utils.PY3:
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class B(object):
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def __unicode__(self):
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return u'Unicode string: \u5b54\u5b50'
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def __str__(self):
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return unicode(self).encode('utf-8')
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b = B()
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assert str(a) == str(b)
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def test_implements_py2_iterator(self):
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class Upper(object):
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def __init__(self, iterable):
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self._iter = iter(iterable)
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def __next__(self): # note the Py3 interface
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return next(self._iter).upper()
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def __iter__(self):
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return self
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self.assertEqual(list(Upper('hello')), list('HELLO'))
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# Try combining it with the next() function:
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class MyIter(object):
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def __next__(self):
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return 'Next!'
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def __iter__(self):
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return self
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itr = MyIter()
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self.assertEqual(next(itr), 'Next!')
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itr2 = MyIter()
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for i, item in enumerate(itr2):
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if i >= 10:
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break
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self.assertEqual(item, 'Next!')
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def test_implements_py2_nonzero(self):
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class EvenIsTrue(object):
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"""
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An integer that evaluates to True if even.
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"""
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def __init__(self, my_int):
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self.my_int = my_int
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def __bool__(self):
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return self.my_int % 2 == 0
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def __add__(self, other):
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return type(self)(self.my_int + other)
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k = EvenIsTrue(5)
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self.assertFalse(k)
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self.assertFalse(bool(k))
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self.assertTrue(k + 1)
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self.assertTrue(bool(k + 1))
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self.assertFalse(k + 2)
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def test_int_implements_py2_nonzero(self):
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"""
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Tests whether the newint object provides a __nonzero__ method that
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maps to __bool__ in case the user redefines __bool__ in a subclass of
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newint.
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"""
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class EvenIsTrue(int):
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"""
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An integer that evaluates to True if even.
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"""
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def __bool__(self):
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return self % 2 == 0
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def __add__(self, other):
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val = super().__add__(other)
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return type(self)(val)
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k = EvenIsTrue(5)
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self.assertFalse(k)
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self.assertFalse(bool(k))
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self.assertTrue(k + 1)
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self.assertTrue(bool(k + 1))
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self.assertFalse(k + 2)
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def test_non_iterator(self):
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"""
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The default behaviour of next(o) for a newobject o should be to raise a
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TypeError, as with the corresponding builtin object.
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"""
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o = object()
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with self.assertRaises(TypeError):
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next(o)
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def test_bool_empty_object(self):
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"""
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The default result of bool(newobject()) should be True, as with builtin
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objects.
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"""
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o = object()
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self.assertTrue(bool(o))
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class MyClass(object):
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pass
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obj = MyClass()
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self.assertTrue(bool(obj))
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def test_isinstance_object_subclass(self):
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"""
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This was failing before
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"""
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class A(object):
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pass
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a = A()
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class B(object):
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pass
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b = B()
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self.assertFalse(isinstance(a, B))
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self.assertFalse(isinstance(b, A))
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self.assertTrue(isinstance(a, A))
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self.assertTrue(isinstance(b, B))
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class C(A):
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pass
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c = C()
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self.assertTrue(isinstance(c, A))
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self.assertFalse(isinstance(c, B))
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self.assertFalse(isinstance(a, C))
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self.assertFalse(isinstance(b, C))
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self.assertTrue(isinstance(c, C))
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@expectedFailurePY2
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def test_types_isinstance_newobject(self):
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a = list()
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b = dict()
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c = set()
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self.assertTrue(isinstance(a, object))
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self.assertTrue(isinstance(b, object))
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self.assertTrue(isinstance(c, object))
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# Old-style class instances on Py2 should still report as an instance
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# of object as usual on Py2:
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class D:
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pass
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d = D()
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self.assertTrue(isinstance(d, object))
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e = object()
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self.assertTrue(isinstance(e, object))
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class F(object):
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pass
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f = F()
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self.assertTrue(isinstance(f, object))
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class G(F):
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pass
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g = G()
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self.assertTrue(isinstance(g, object))
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class H():
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pass
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h = H()
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self.assertTrue(isinstance(h, object))
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def test_long_special_method(self):
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class A(object):
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def __int__(self):
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return 0
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a = A()
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self.assertEqual(int(a), 0)
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if utils.PY2:
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self.assertEqual(long(a), 0)
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def test_multiple_inheritance(self):
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"""
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Issue #96
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"""
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if utils.PY2:
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from collections import Container
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else:
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from collections.abc import Container
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class Base(object):
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pass
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class Foo(Base, Container):
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def __contains__(self, item):
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return False
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def test_with_metaclass_and_object(self):
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"""
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Issue #91
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"""
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from future.utils import with_metaclass
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class MetaClass(type):
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pass
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class TestClass(with_metaclass(MetaClass, object)):
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pass
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def test_bool(self):
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"""
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Issue #211
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"""
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from builtins import object
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class ResultSet(object):
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def __len__(self):
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return 0
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self.assertTrue(bool(ResultSet()) is False)
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class ResultSet(object):
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def __len__(self):
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return 2
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self.assertTrue(bool(ResultSet()) is True)
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def test_bool2(self):
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"""
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If __bool__ is defined, the presence or absence of __len__ should
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be irrelevant.
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"""
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from builtins import object
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class TrueThing(object):
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def __bool__(self):
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return True
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def __len__(self):
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raise RuntimeError('__len__ should not be called')
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self.assertTrue(bool(TrueThing()))
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class FalseThing(object):
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def __bool__(self):
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return False
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def __len__(self):
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raise RuntimeError('__len__ should not be called')
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self.assertFalse(bool(FalseThing()))
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def test_cannot_assign_new_attributes_to_object(self):
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"""
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New attributes cannot be assigned to object() instances in Python.
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The same should apply to newobject.
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"""
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from builtins import object
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with self.assertRaises(AttributeError):
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object().arbitrary_attribute_name = True
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if __name__ == '__main__':
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unittest.main()
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