class DescriptorDecorator_WrappingABindingDescriptor(TestCase):
def setUp(self):
self.decor = DescriptorDecoratorBase(mocks.Binding(mocks.Descriptor()))
self.Class = type(mocks.ClassWithDescriptor(self.decor))
def test_get_from_class_returns_UnboundAttribute(self):
result = self.decor.__get__(None, self.Class)
self.assertIsInstance(result, UnboundAttribute)
def test_UnboundAttribute_lifts_descriptor(self):
result = self.decor.__get__(None, self.Class)
self.assertIs(result.descriptor, self.decor)
class DescriptorDecorator_WrappingABindingDescriptor(TestCase):
def setUp(self):
self.decor = DescriptorDecoratorBase(mocks.Binding(mocks.Descriptor()))
self.Class = type(mocks.ClassWithDescriptor(self.decor))
def test_get_from_class_returns_UnboundAttribute(self):
result = self.decor.__get__(None, self.Class)
self.assertIsInstance(result, UnboundAttribute)
def test_UnboundAttribute_lifts_descriptor(self):
result = self.decor.__get__(None, self.Class)
self.assertIs(result.descriptor, self.decor)
class DescriptorDecorator_WrappingADataDescriptorWithoutGet(TestCase):
def setUp(self):
self.decor = DescriptorDecoratorBase(mocks.Stubs.DataDescriptorWithoutGet())
self.instance = mocks.ClassWithDescriptor(self.decor)
self.Class = type(self.instance)
def test_get_from_instance_returns_self(self):
result = self.decor.__get__(self.instance, self.Class)
self.assertIs(result, self.decor)
def test_get_from_class_returns_self(self):
result = self.decor.__get__(None, self.Class)
self.assertIs(result, self.decor)
class DescriptorDecorator_WrappingADataDescriptorWithoutGet(TestCase):
def setUp(self):
self.decor = DescriptorDecoratorBase(mocks.Stubs.DataDescriptorWithoutGet())
self.instance = mocks.ClassWithDescriptor(self.decor)
self.Class = type(self.instance)
def test_get_from_instance_returns_self(self):
result = self.decor.__get__(self.instance, self.Class)
self.assertIs(result, self.decor)
def test_get_from_class_returns_self(self):
result = self.decor.__get__(None, self.Class)
self.assertIs(result, self.decor)
class DescriptorDecorator_WrappingANonDataDescriptor_Test(TestCase):
def setUp(self):
self.wrapped = mocks.Stubs.NonDataDescriptor()
self.decor = DescriptorDecoratorBase(self.wrapped)
self.instance = mocks.ClassWithDescriptor(self.decor)
self.Class = type(self.instance)
def test_get_from_class(self):
self.assertIs(self.decor, self.decor.__get__(None, self.Class))
def test_get_from_class_redirects(self):
self.decor.__get__(None, self.Class)
self.assertTrue(self.wrapped.get_called)
def test_get_from_instance(self):
# The NonDataDescriptor returns self regardless of whether there's an
# instance - typical non-data descriptors ignore instance
self.assertIs(self.decor, self.decor.__get__(self.instance, self.Class))
def test_get_from_instance_redirects(self):
self.decor.__get__(self.instance, self.Class)
self.assertTrue(self.wrapped.get_called)
def test_set_adds_to_instance(self):
self.decor.__set__(self.instance, 5)
self.assertEqual(self.instance.__dict__['attr'], 5)
def test_delete_fails(self):
with self.assertRaises(AttributeError):
self.decor.__delete__(self.instance)
class DescriptorDecorator_WrappingANonDataDescriptor_Test(TestCase):
def setUp(self):
self.wrapped = mocks.Stubs.NonDataDescriptor()
self.decor = DescriptorDecoratorBase(self.wrapped)
self.instance = mocks.ClassWithDescriptor(self.decor)
self.Class = type(self.instance)
def test_get_from_class(self):
self.assertIs(self.decor, self.decor.__get__(None, self.Class))
def test_get_from_class_redirects(self):
self.decor.__get__(None, self.Class)
self.assertTrue(self.wrapped.get_called)
def test_get_from_instance(self):
# The NonDataDescriptor returns self regardless of whether there's an
# instance - typical non-data descriptors ignore instance
self.assertIs(self.decor, self.decor.__get__(self.instance, self.Class))
def test_get_from_instance_redirects(self):
self.decor.__get__(self.instance, self.Class)
self.assertTrue(self.wrapped.get_called)
def test_set_adds_to_instance(self):
self.decor.__set__(self.instance, 5)
self.assertEqual(self.instance.__dict__['attr'], 5)
def test_delete_fails(self):
with self.assertRaises(AttributeError):
self.decor.__delete__(self.instance)
class DescriptorDecorator_WrappingADataDescriptor_Test(TestCase):
def setUp(self):
self.wrapped = mocks.Stubs.FullDataDescriptor()
self.decor = DescriptorDecoratorBase(self.wrapped)
self.instance = mocks.ClassWithDescriptor(self.decor)
self.Class = type(self.instance)
def test_get_from_class_lifts_to_self(self):
self.assertIs(self.decor, self.decor.__get__(None, self.Class))
def test_get_from_class_redirects(self):
self.decor.__get__(None, self.Class)
self.assertTrue(self.wrapped.get_called)
def test_get_from_instance(self):
result = self.decor.__get__(self.instance, self.Class)
self.assertEqual(result, self.wrapped.__get__(self.instance,
self.Class))
def test_get_from_instance_redirects(self):
self.decor.__get__(self.instance, self.Class)
self.assertTrue(self.wrapped.get_called)
def test_set_does_not_add_to_instance(self):
self.decor.__set__(self.instance, 5)
self.assertFalse('attr' in self.instance.__dict__)
def test_set_redirects(self):
self.decor.__set__(self.instance, 5)
self.assertTrue(self.wrapped.set_called)
def test_delete_redirects(self):
self.decor.__delete__(self.instance)
self.assertTrue(self.wrapped.delete_called)
class DescriptorDecorator_WrappingADataDescriptor_Test(TestCase):
def setUp(self):
self.wrapped = mocks.Stubs.FullDataDescriptor()
self.decor = DescriptorDecoratorBase(self.wrapped)
self.instance = mocks.ClassWithDescriptor(self.decor)
self.Class = type(self.instance)
def test_get_from_class_lifts_to_self(self):
self.assertIs(self.decor, self.decor.__get__(None, self.Class))
def test_get_from_class_redirects(self):
self.decor.__get__(None, self.Class)
self.assertTrue(self.wrapped.get_called)
def test_get_from_instance(self):
result = self.decor.__get__(self.instance, self.Class)
self.assertEqual(result, self.wrapped.__get__(self.instance, self.Class))
def test_get_from_instance_redirects(self):
self.decor.__get__(self.instance, self.Class)
self.assertTrue(self.wrapped.get_called)
def test_set_does_not_add_to_instance(self):
self.decor.__set__(self.instance, 5)
self.assertFalse('attr' in self.instance.__dict__)
def test_set_redirects(self):
self.decor.__set__(self.instance, 5)
self.assertTrue(self.wrapped.set_called)
def test_delete_redirects(self):
self.decor.__delete__(self.instance)
self.assertTrue(self.wrapped.delete_called)
