def test_protocol(self):
ext_reg = ExtensionRegistry()
a_obj = A()
def b_loader(ext):
return B(name=ext.name)
a_ext = ext_reg.add_extension(component=a_obj, point='A', name='test')
b_ext = ext_reg.add_extension(loader=b_loader, point='B', name='test')
self.assertEqual(True, ext_reg.has_extension('A', 'test'))
self.assertIsInstance(a_ext, Extension)
self.assertEqual('test', a_ext.name)
self.assertEqual('A', a_ext.point)
self.assertEqual(False, a_ext.is_lazy)
self.assertIs(a_obj, a_ext.component)
self.assertIs(a_obj, a_ext.component)
self.assertIs(a_obj, ext_reg.get_component('A', 'test'))
self.assertIs(a_ext, ext_reg.get_extension('A', 'test'))
self.assertEqual(True, ext_reg.has_extension('B', 'test'))
self.assertIsInstance(b_ext, Extension)
self.assertEqual('test', b_ext.name)
self.assertEqual('B', b_ext.point)
self.assertEqual(True, b_ext.is_lazy)
b_obj = b_ext.component
self.assertIs(b_obj, b_ext.component)
self.assertIs(b_obj, ext_reg.get_component('B', 'test'))
self.assertIs(b_ext, ext_reg.get_extension('B', 'test'))
self.assertEqual({'name': 'test'}, b_obj.kwargs)
self.assertEqual([a_ext], ext_reg.find_extensions('A'))
self.assertEqual([b_ext], ext_reg.find_extensions('B'))
self.assertEqual([], ext_reg.find_extensions('C'))
self.assertEqual([a_obj], ext_reg.find_components('A'))
self.assertEqual([b_obj], ext_reg.find_components('B'))
self.assertEqual([], ext_reg.find_components('C'))
ext_reg.remove_extension('A', 'test')
self.assertEqual(False, ext_reg.has_extension('A', 'test'))
ext_reg.remove_extension('B', 'test')
self.assertEqual(False, ext_reg.has_extension('B', 'test'))
def test_get_component_illegal(self):
ext_reg = ExtensionRegistry()
with self.assertRaises(ValueError) as cm:
ext_reg.get_component('A', 'test')
self.assertEqual("extension 'test' not found for extension point 'A'", f'{cm.exception}')