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Edit: test_typechecks.py
"""Unit tests for __instancecheck__ and __subclasscheck__.""" import unittest class ABC(type): def __instancecheck__(cls, inst): """Implement isinstance(inst, cls).""" return any(cls.__subclasscheck__(c) for c in {type(inst), inst.__class__}) def __subclasscheck__(cls, sub): """Implement issubclass(sub, cls).""" candidates = cls.__dict__.get("__subclass__", set()) | {cls} return any(c in candidates for c in sub.mro()) class Integer(metaclass=ABC): __subclass__ = {int} class SubInt(Integer): pass class TypeChecksTest(unittest.TestCase): def testIsSubclassInternal(self): self.assertEqual(Integer.__subclasscheck__(int), True) self.assertEqual(Integer.__subclasscheck__(float), False) def testIsSubclassBuiltin(self): self.assertEqual(issubclass(int, Integer), True) self.assertEqual(issubclass(int, (Integer,)), True) self.assertEqual(issubclass(float, Integer), False) self.assertEqual(issubclass(float, (Integer,)), False) def testIsInstanceBuiltin(self): self.assertEqual(isinstance(42, Integer), True) self.assertEqual(isinstance(42, (Integer,)), True) self.assertEqual(isinstance(3.14, Integer), False) self.assertEqual(isinstance(3.14, (Integer,)), False) def testIsInstanceActual(self): self.assertEqual(isinstance(Integer(), Integer), True) self.assertEqual(isinstance(Integer(), (Integer,)), True) def testIsSubclassActual(self): self.assertEqual(issubclass(Integer, Integer), True) self.assertEqual(issubclass(Integer, (Integer,)), True) def testSubclassBehavior(self): self.assertEqual(issubclass(SubInt, Integer), True) self.assertEqual(issubclass(SubInt, (Integer,)), True) self.assertEqual(issubclass(SubInt, SubInt), True) self.assertEqual(issubclass(SubInt, (SubInt,)), True) self.assertEqual(issubclass(Integer, SubInt), False) self.assertEqual(issubclass(Integer, (SubInt,)), False) self.assertEqual(issubclass(int, SubInt), False) self.assertEqual(issubclass(int, (SubInt,)), False) self.assertEqual(isinstance(SubInt(), Integer), True) self.assertEqual(isinstance(SubInt(), (Integer,)), True) self.assertEqual(isinstance(SubInt(), SubInt), True) self.assertEqual(isinstance(SubInt(), (SubInt,)), True) self.assertEqual(isinstance(42, SubInt), False) self.assertEqual(isinstance(42, (SubInt,)), False) if __name__ == "__main__": unittest.main()
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