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# -*- coding: utf-8 -*-
from __future__ import absolute_import
import inspect
import unittest
import warnings
import mock
from scrapy.utils.deprecate import create_deprecated_class
class MyWarning(UserWarning):
pass
class SomeBaseClass(object):
pass
class NewName(SomeBaseClass):
pass
class WarnWhenSubclassedTest(unittest.TestCase):
def _mywarnings(self, w, category=MyWarning):
return [x for x in w if x.category is MyWarning]
def test_no_warning_on_definition(self):
with warnings.catch_warnings(record=True) as w:
Deprecated = create_deprecated_class('Deprecated', NewName)
w = self._mywarnings(w)
self.assertEqual(w, [])
def test_subclassing_warning_message(self):
Deprecated = create_deprecated_class('Deprecated', NewName,
warn_category=MyWarning)
with warnings.catch_warnings(record=True) as w:
class UserClass(Deprecated):
pass
w = self._mywarnings(w)
self.assertEqual(len(w), 1)
self.assertEqual(
str(w[0].message),
"scrapy.tests.test_utils_deprecate.UserClass inherits from "
"deprecated class scrapy.tests.test_utils_deprecate.Deprecated, "
"please inherit from scrapy.tests.test_utils_deprecate.NewName."
" (warning only on first subclass, there may be others)"
)
self.assertEqual(w[0].lineno, inspect.getsourcelines(UserClass)[1])
def test_custom_class_paths(self):
Deprecated = create_deprecated_class('Deprecated', NewName,
new_class_path='foo.NewClass',
old_class_path='bar.OldClass',
warn_category=MyWarning)
with warnings.catch_warnings(record=True) as w:
class UserClass(Deprecated):
pass
_ = Deprecated()
w = self._mywarnings(w)
self.assertEqual(len(w), 2)
self.assertIn('foo.NewClass', str(w[0].message))
self.assertIn('bar.OldClass', str(w[0].message))
self.assertIn('foo.NewClass', str(w[1].message))
self.assertIn('bar.OldClass', str(w[1].message))
def test_subclassing_warns_only_on_direct_childs(self):
Deprecated = create_deprecated_class('Deprecated', NewName,
warn_once=False,
warn_category=MyWarning)
with warnings.catch_warnings(record=True) as w:
class UserClass(Deprecated):
pass
class NoWarnOnMe(UserClass):
pass
w = self._mywarnings(w)
self.assertEqual(len(w), 1)
self.assertIn('UserClass', str(w[0].message))
def test_subclassing_warns_once_by_default(self):
Deprecated = create_deprecated_class('Deprecated', NewName,
warn_category=MyWarning)
with warnings.catch_warnings(record=True) as w:
class UserClass(Deprecated):
pass
class FooClass(Deprecated):
pass
class BarClass(Deprecated):
pass
w = self._mywarnings(w)
self.assertEqual(len(w), 1)
self.assertIn('UserClass', str(w[0].message))
def test_warning_on_instance(self):
Deprecated = create_deprecated_class('Deprecated', NewName,
warn_category=MyWarning)
# ignore subclassing warnings
with warnings.catch_warnings(record=True):
class UserClass(Deprecated):
pass
with warnings.catch_warnings(record=True) as w:
_, lineno = Deprecated(), inspect.getlineno(inspect.currentframe())
_ = UserClass() # subclass instances don't warn
w = self._mywarnings(w)
self.assertEqual(len(w), 1)
self.assertEqual(
str(w[0].message),
"scrapy.tests.test_utils_deprecate.Deprecated is deprecated, "
"instantiate scrapy.tests.test_utils_deprecate.NewName instead."
)
self.assertEqual(w[0].lineno, lineno)
def test_warning_auto_message(self):
with warnings.catch_warnings(record=True) as w:
Deprecated = create_deprecated_class('Deprecated', NewName)
class UserClass2(Deprecated):
pass
msg = str(w[0].message)
self.assertIn("scrapy.tests.test_utils_deprecate.NewName", msg)
self.assertIn("scrapy.tests.test_utils_deprecate.Deprecated", msg)
def test_issubclass(self):
with warnings.catch_warnings(record=True):
DeprecatedName = create_deprecated_class('DeprecatedName', NewName)
class UpdatedUserClass1(NewName):
pass
class UpdatedUserClass1a(NewName):
pass
class OutdatedUserClass1(DeprecatedName):
pass
class OutdatedUserClass1a(DeprecatedName):
pass
class UnrelatedClass(object):
pass
class OldStyleClass:
pass
assert issubclass(UpdatedUserClass1, NewName)
assert issubclass(UpdatedUserClass1a, NewName)
assert issubclass(UpdatedUserClass1, DeprecatedName)
assert issubclass(UpdatedUserClass1a, DeprecatedName)
assert issubclass(OutdatedUserClass1, DeprecatedName)
assert not issubclass(UnrelatedClass, DeprecatedName)
assert not issubclass(OldStyleClass, DeprecatedName)
assert not issubclass(OldStyleClass, DeprecatedName)
assert not issubclass(OutdatedUserClass1, OutdatedUserClass1a)
assert not issubclass(OutdatedUserClass1a, OutdatedUserClass1)
self.assertRaises(TypeError, issubclass, object(), DeprecatedName)
def test_isinstance(self):
with warnings.catch_warnings(record=True):
DeprecatedName = create_deprecated_class('DeprecatedName', NewName)
class UpdatedUserClass2(NewName):
pass
class UpdatedUserClass2a(NewName):
pass
class OutdatedUserClass2(DeprecatedName):
pass
class OutdatedUserClass2a(DeprecatedName):
pass
class UnrelatedClass(object):
pass
class OldStyleClass:
pass
assert isinstance(UpdatedUserClass2(), NewName)
assert isinstance(UpdatedUserClass2a(), NewName)
assert isinstance(UpdatedUserClass2(), DeprecatedName)
assert isinstance(UpdatedUserClass2a(), DeprecatedName)
assert isinstance(OutdatedUserClass2(), DeprecatedName)
assert isinstance(OutdatedUserClass2a(), DeprecatedName)
assert not isinstance(OutdatedUserClass2a(), OutdatedUserClass2)
assert not isinstance(OutdatedUserClass2(), OutdatedUserClass2a)
assert not isinstance(UnrelatedClass(), DeprecatedName)
assert not isinstance(OldStyleClass(), DeprecatedName)
def test_clsdict(self):
with warnings.catch_warnings(record=True):
Deprecated = create_deprecated_class('Deprecated', NewName, {'foo': 'bar'})
self.assertEqual(Deprecated.foo, 'bar')
def test_deprecate_a_class_with_custom_metaclass(self):
Meta1 = type('Meta1', (type,), {})
New = Meta1('New', (), {})
Deprecated = create_deprecated_class('Deprecated', New)
def test_deprecate_subclass_of_deprecated_class(self):
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('always')
Deprecated = create_deprecated_class('Deprecated', NewName,
warn_category=MyWarning)
AlsoDeprecated = create_deprecated_class('AlsoDeprecated', Deprecated,
new_class_path='foo.Bar',
warn_category=MyWarning)
w = self._mywarnings(w)
self.assertEqual(len(w), 0, str(map(str, w)))
with warnings.catch_warnings(record=True) as w:
AlsoDeprecated()
class UserClass(AlsoDeprecated):
pass
w = self._mywarnings(w)
self.assertEqual(len(w), 2)
self.assertIn('AlsoDeprecated', str(w[0].message))
self.assertIn('foo.Bar', str(w[0].message))
self.assertIn('AlsoDeprecated', str(w[1].message))
self.assertIn('foo.Bar', str(w[1].message))
def test_inspect_stack(self):
with mock.patch('inspect.stack', side_effect=IndexError):
with warnings.catch_warnings(record=True) as w:
DeprecatedName = create_deprecated_class('DeprecatedName', NewName)
class SubClass(DeprecatedName):
pass
self.assertIn("Error detecting parent module", str(w[0].message))
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