Unlock 30% off on Manual Testing Annual Plans this Holiday Season.

Copied to Clipboard!

How to use __init_subclass__ method in molecule

Best Python code snippet using molecule_python

test_subclassinit.py

Source:test_subclassinit.py

...4class Test(unittest.TestCase):5    def test_init_subclass(self):6        class A:7            initialized = False8            def __init_subclass__(cls):9                super().__init_subclass__()10                cls.initialized = True11        class B(A):12            pass13        self.assertFalse(A.initialized)14        self.assertTrue(B.initialized)15    def test_init_subclass_dict(self):16        class A(dict):17            initialized = False18            def __init_subclass__(cls):19                super().__init_subclass__()20                cls.initialized = True21        class B(A):22            pass23        self.assertFalse(A.initialized)24        self.assertTrue(B.initialized)25    def test_init_subclass_kwargs(self):26        class A:27            def __init_subclass__(cls, **kwargs):28                cls.kwargs = kwargs29        class B(A, x=3):30            pass31        self.assertEqual(B.kwargs, dict(x=3))32    def test_init_subclass_error(self):33        class A:34            def __init_subclass__(cls):35                raise RuntimeError36        with self.assertRaises(RuntimeError):37            class B(A):38                pass39    def test_init_subclass_wrong(self):40        class A:41            def __init_subclass__(cls, whatever):42                pass43        with self.assertRaises(TypeError):44            class B(A):45                pass46    def test_init_subclass_skipped(self):47        class BaseWithInit:48            def __init_subclass__(cls, **kwargs):49                super().__init_subclass__(**kwargs)50                cls.initialized = cls51        class BaseWithoutInit(BaseWithInit):52            pass53        class A(BaseWithoutInit):54            pass55        self.assertIs(A.initialized, A)56        self.assertIs(BaseWithoutInit.initialized, BaseWithoutInit)57    def test_init_subclass_diamond(self):58        class Base:59            def __init_subclass__(cls, **kwargs):60                super().__init_subclass__(**kwargs)61                cls.calls = []62        class Left(Base):63            pass64        class Middle:65            def __init_subclass__(cls, middle, **kwargs):66                super().__init_subclass__(**kwargs)67                cls.calls += [middle]68        class Right(Base):69            def __init_subclass__(cls, right="right", **kwargs):70                super().__init_subclass__(**kwargs)71                cls.calls += [right]72        class A(Left, Middle, Right, middle="middle"):73            pass74        self.assertEqual(A.calls, ["right", "middle"])75        self.assertEqual(Left.calls, [])76        self.assertEqual(Right.calls, [])77    def test_set_name(self):78        class Descriptor:79            def __set_name__(self, owner, name):80                self.owner = owner81                self.name = name82        class A:83            d = Descriptor()84        self.assertEqual(A.d.name, "d")85        self.assertIs(A.d.owner, A)86    def test_set_name_metaclass(self):87        class Meta(type):88            def __new__(cls, name, bases, ns):89                ret = super().__new__(cls, name, bases, ns)90                self.assertEqual(ret.d.name, "d")91                self.assertIs(ret.d.owner, ret)92                return 093        class Descriptor:94            def __set_name__(self, owner, name):95                self.owner = owner96                self.name = name97        class A(metaclass=Meta):98            d = Descriptor()99        self.assertEqual(A, 0)100    def test_set_name_error(self):101        class Descriptor:102            def __set_name__(self, owner, name):103                1/0104        with self.assertRaises(RuntimeError) as cm:105            class NotGoingToWork:106                attr = Descriptor()107        exc = cm.exception108        self.assertRegex(str(exc), r'\bNotGoingToWork\b')109        self.assertRegex(str(exc), r'\battr\b')110        self.assertRegex(str(exc), r'\bDescriptor\b')111        self.assertIsInstance(exc.__cause__, ZeroDivisionError)112    def test_set_name_wrong(self):113        class Descriptor:114            def __set_name__(self):115                pass116        with self.assertRaises(RuntimeError) as cm:117            class NotGoingToWork:118                attr = Descriptor()119        exc = cm.exception120        self.assertRegex(str(exc), r'\bNotGoingToWork\b')121        self.assertRegex(str(exc), r'\battr\b')122        self.assertRegex(str(exc), r'\bDescriptor\b')123        self.assertIsInstance(exc.__cause__, TypeError)124    def test_set_name_lookup(self):125        resolved = []126        class NonDescriptor:127            def __getattr__(self, name):128                resolved.append(name)129        class A:130            d = NonDescriptor()131        self.assertNotIn('__set_name__', resolved,132                         '__set_name__ is looked up in instance dict')133    def test_set_name_init_subclass(self):134        class Descriptor:135            def __set_name__(self, owner, name):136                self.owner = owner137                self.name = name138        class Meta(type):139            def __new__(cls, name, bases, ns):140                self = super().__new__(cls, name, bases, ns)141                self.meta_owner = self.owner142                self.meta_name = self.name143                return self144        class A:145            def __init_subclass__(cls):146                cls.owner = cls.d.owner147                cls.name = cls.d.name148        class B(A, metaclass=Meta):149            d = Descriptor()150        self.assertIs(B.owner, B)151        self.assertEqual(B.name, 'd')152        self.assertIs(B.meta_owner, B)153        self.assertEqual(B.name, 'd')154    def test_set_name_modifying_dict(self):155        notified = []156        class Descriptor:157            def __set_name__(self, owner, name):158                setattr(owner, name + 'x', None)159                notified.append(name)...

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.