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import sys
import unittest
import six
from scrapy.item import ABCMeta, Item, ItemMeta, Field
from tests import mock
PY36_PLUS = (sys.version_info.major >= 3) and (sys.version_info.minor >= 6)
class ItemTest(unittest.TestCase):
def assertSortedEqual(self, first, second, msg=None):
return self.assertEqual(sorted(first), sorted(second), msg)
def test_simple(self):
class TestItem(Item):
name = Field()
i = TestItem()
i['name'] = u'name'
self.assertEqual(i['name'], u'name')
def test_init(self):
class TestItem(Item):
name = Field()
i = TestItem()
self.assertRaises(KeyError, i.__getitem__, 'name')
i2 = TestItem(name=u'john doe')
self.assertEqual(i2['name'], u'john doe')
i3 = TestItem({'name': u'john doe'})
self.assertEqual(i3['name'], u'john doe')
i4 = TestItem(i3)
self.assertEqual(i4['name'], u'john doe')
self.assertRaises(KeyError, TestItem, {'name': u'john doe',
'other': u'foo'})
def test_invalid_field(self):
class TestItem(Item):
pass
i = TestItem()
self.assertRaises(KeyError, i.__setitem__, 'field', 'text')
self.assertRaises(KeyError, i.__getitem__, 'field')
def test_repr(self):
class TestItem(Item):
name = Field()
number = Field()
i = TestItem()
i['name'] = u'John Doe'
i['number'] = 123
itemrepr = repr(i)
if six.PY2:
self.assertEqual(itemrepr,
"{'name': u'John Doe', 'number': 123}")
else:
self.assertEqual(itemrepr,
"{'name': 'John Doe', 'number': 123}")
i2 = eval(itemrepr)
self.assertEqual(i2['name'], 'John Doe')
self.assertEqual(i2['number'], 123)
def test_private_attr(self):
class TestItem(Item):
name = Field()
i = TestItem()
i._private = 'test'
self.assertEqual(i._private, 'test')
def test_raise_getattr(self):
class TestItem(Item):
name = Field()
i = TestItem()
self.assertRaises(AttributeError, getattr, i, 'name')
def test_raise_setattr(self):
class TestItem(Item):
name = Field()
i = TestItem()
self.assertRaises(AttributeError, setattr, i, 'name', 'john')
def test_custom_methods(self):
class TestItem(Item):
name = Field()
def get_name(self):
return self['name']
def change_name(self, name):
self['name'] = name
i = TestItem()
self.assertRaises(KeyError, i.get_name)
i['name'] = u'lala'
self.assertEqual(i.get_name(), u'lala')
i.change_name(u'other')
self.assertEqual(i.get_name(), 'other')
def test_metaclass(self):
class TestItem(Item):
name = Field()
keys = Field()
values = Field()
i = TestItem()
i['name'] = u'John'
self.assertEqual(list(i.keys()), ['name'])
self.assertEqual(list(i.values()), ['John'])
i['keys'] = u'Keys'
i['values'] = u'Values'
self.assertSortedEqual(list(i.keys()), ['keys', 'values', 'name'])
self.assertSortedEqual(list(i.values()), [u'Keys', u'Values', u'John'])
def test_metaclass_with_fields_attribute(self):
class TestItem(Item):
fields = {'new': Field(default='X')}
item = TestItem(new=u'New')
self.assertSortedEqual(list(item.keys()), ['new'])
self.assertSortedEqual(list(item.values()), [u'New'])
def test_metaclass_inheritance(self):
class BaseItem(Item):
name = Field()
keys = Field()
values = Field()
class TestItem(BaseItem):
keys = Field()
i = TestItem()
i['keys'] = 3
self.assertEqual(list(i.keys()), ['keys'])
self.assertEqual(list(i.values()), [3])
def test_metaclass_multiple_inheritance_simple(self):
class A(Item):
fields = {'load': Field(default='A')}
save = Field(default='A')
class B(A): pass
class C(Item):
fields = {'load': Field(default='C')}
save = Field(default='C')
class D(B, C): pass
item = D(save='X', load='Y')
self.assertEqual(item['save'], 'X')
self.assertEqual(item['load'], 'Y')
self.assertEqual(D.fields, {'load': {'default': 'A'},
'save': {'default': 'A'}})
# D class inverted
class E(C, B): pass
self.assertEqual(E(save='X')['save'], 'X')
self.assertEqual(E(load='X')['load'], 'X')
self.assertEqual(E.fields, {'load': {'default': 'C'},
'save': {'default': 'C'}})
def test_metaclass_multiple_inheritance_diamond(self):
class A(Item):
fields = {'update': Field(default='A')}
save = Field(default='A')
load = Field(default='A')
class B(A): pass
class C(A):
fields = {'update': Field(default='C')}
save = Field(default='C')
class D(B, C):
fields = {'update': Field(default='D')}
load = Field(default='D')
self.assertEqual(D(save='X')['save'], 'X')
self.assertEqual(D(load='X')['load'], 'X')
self.assertEqual(D.fields, {'save': {'default': 'C'},
'load': {'default': 'D'}, 'update': {'default': 'D'}})
# D class inverted
class E(C, B):
load = Field(default='E')
self.assertEqual(E(save='X')['save'], 'X')
self.assertEqual(E(load='X')['load'], 'X')
self.assertEqual(E.fields, {'save': {'default': 'C'},
'load': {'default': 'E'}, 'update': {'default': 'C'}})
def test_metaclass_multiple_inheritance_without_metaclass(self):
class A(Item):
fields = {'load': Field(default='A')}
save = Field(default='A')
class B(A): pass
class C(object):
fields = {'load': Field(default='C')}
not_allowed = Field(default='not_allowed')
save = Field(default='C')
class D(B, C): pass
self.assertRaises(KeyError, D, not_allowed='value')
self.assertEqual(D(save='X')['save'], 'X')
self.assertEqual(D.fields, {'save': {'default': 'A'},
'load': {'default': 'A'}})
# D class inverted
class E(C, B): pass
self.assertRaises(KeyError, E, not_allowed='value')
self.assertEqual(E(save='X')['save'], 'X')
self.assertEqual(E.fields, {'save': {'default': 'A'},
'load': {'default': 'A'}})
def test_to_dict(self):
class TestItem(Item):
name = Field()
i = TestItem()
i['name'] = u'John'
self.assertEqual(dict(i), {'name': u'John'})
def test_copy(self):
class TestItem(Item):
name = Field()
item = TestItem({'name':'lower'})
copied_item = item.copy()
self.assertNotEqual(id(item), id(copied_item))
copied_item['name'] = copied_item['name'].upper()
self.assertNotEqual(item['name'], copied_item['name'])
class ItemMetaTest(unittest.TestCase):
def test_new_method_propagates_classcell(self):
new_mock = mock.Mock(side_effect=ABCMeta.__new__)
base = ItemMeta.__bases__[0]
with mock.patch.object(base, '__new__', new_mock):
class MyItem(Item):
if not PY36_PLUS:
# This attribute is an internal attribute in Python 3.6+
# and must be propagated properly. See
# https://docs.python.org/3.6/reference/datamodel.html#creating-the-class-object
# In <3.6, we add a dummy attribute just to ensure the
# __new__ method propagates it correctly.
__classcell__ = object()
def f(self):
# For rationale of this see:
# https://github.com/python/cpython/blob/ee1a81b77444c6715cbe610e951c655b6adab88b/Lib/test/test_super.py#L222
return __class__ # noqa https://github.com/scrapy/scrapy/issues/2836
MyItem()
(first_call, second_call) = new_mock.call_args_list[-2:]
mcs, class_name, bases, attrs = first_call[0]
assert '__classcell__' not in attrs
mcs, class_name, bases, attrs = second_call[0]
assert '__classcell__' in attrs
class ItemMetaClassCellRegression(unittest.TestCase):
def test_item_meta_classcell_regression(self):
class MyItem(six.with_metaclass(ItemMeta, Item)):
def __init__(self, *args, **kwargs):
# This call to super() trigger the __classcell__ propagation
# requirement. When not done properly raises an error:
# TypeError: __class__ set to <class '__main__.MyItem'>
# defining 'MyItem' as <class '__main__.MyItem'>
super(MyItem, self).__init__(*args, **kwargs)
if __name__ == "__main__":
unittest.main()
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