| 1 | n/a | """Unit tests for __instancecheck__ and __subclasscheck__.""" |
|---|
| 2 | n/a | |
|---|
| 3 | n/a | import unittest |
|---|
| 4 | n/a | |
|---|
| 5 | n/a | |
|---|
| 6 | n/a | class ABC(type): |
|---|
| 7 | n/a | |
|---|
| 8 | n/a | def __instancecheck__(cls, inst): |
|---|
| 9 | n/a | """Implement isinstance(inst, cls).""" |
|---|
| 10 | n/a | return any(cls.__subclasscheck__(c) |
|---|
| 11 | n/a | for c in {type(inst), inst.__class__}) |
|---|
| 12 | n/a | |
|---|
| 13 | n/a | def __subclasscheck__(cls, sub): |
|---|
| 14 | n/a | """Implement issubclass(sub, cls).""" |
|---|
| 15 | n/a | candidates = cls.__dict__.get("__subclass__", set()) | {cls} |
|---|
| 16 | n/a | return any(c in candidates for c in sub.mro()) |
|---|
| 17 | n/a | |
|---|
| 18 | n/a | |
|---|
| 19 | n/a | class Integer(metaclass=ABC): |
|---|
| 20 | n/a | __subclass__ = {int} |
|---|
| 21 | n/a | |
|---|
| 22 | n/a | |
|---|
| 23 | n/a | class SubInt(Integer): |
|---|
| 24 | n/a | pass |
|---|
| 25 | n/a | |
|---|
| 26 | n/a | |
|---|
| 27 | n/a | class TypeChecksTest(unittest.TestCase): |
|---|
| 28 | n/a | |
|---|
| 29 | n/a | def testIsSubclassInternal(self): |
|---|
| 30 | n/a | self.assertEqual(Integer.__subclasscheck__(int), True) |
|---|
| 31 | n/a | self.assertEqual(Integer.__subclasscheck__(float), False) |
|---|
| 32 | n/a | |
|---|
| 33 | n/a | def testIsSubclassBuiltin(self): |
|---|
| 34 | n/a | self.assertEqual(issubclass(int, Integer), True) |
|---|
| 35 | n/a | self.assertEqual(issubclass(int, (Integer,)), True) |
|---|
| 36 | n/a | self.assertEqual(issubclass(float, Integer), False) |
|---|
| 37 | n/a | self.assertEqual(issubclass(float, (Integer,)), False) |
|---|
| 38 | n/a | |
|---|
| 39 | n/a | def testIsInstanceBuiltin(self): |
|---|
| 40 | n/a | self.assertEqual(isinstance(42, Integer), True) |
|---|
| 41 | n/a | self.assertEqual(isinstance(42, (Integer,)), True) |
|---|
| 42 | n/a | self.assertEqual(isinstance(3.14, Integer), False) |
|---|
| 43 | n/a | self.assertEqual(isinstance(3.14, (Integer,)), False) |
|---|
| 44 | n/a | |
|---|
| 45 | n/a | def testIsInstanceActual(self): |
|---|
| 46 | n/a | self.assertEqual(isinstance(Integer(), Integer), True) |
|---|
| 47 | n/a | self.assertEqual(isinstance(Integer(), (Integer,)), True) |
|---|
| 48 | n/a | |
|---|
| 49 | n/a | def testIsSubclassActual(self): |
|---|
| 50 | n/a | self.assertEqual(issubclass(Integer, Integer), True) |
|---|
| 51 | n/a | self.assertEqual(issubclass(Integer, (Integer,)), True) |
|---|
| 52 | n/a | |
|---|
| 53 | n/a | def testSubclassBehavior(self): |
|---|
| 54 | n/a | self.assertEqual(issubclass(SubInt, Integer), True) |
|---|
| 55 | n/a | self.assertEqual(issubclass(SubInt, (Integer,)), True) |
|---|
| 56 | n/a | self.assertEqual(issubclass(SubInt, SubInt), True) |
|---|
| 57 | n/a | self.assertEqual(issubclass(SubInt, (SubInt,)), True) |
|---|
| 58 | n/a | self.assertEqual(issubclass(Integer, SubInt), False) |
|---|
| 59 | n/a | self.assertEqual(issubclass(Integer, (SubInt,)), False) |
|---|
| 60 | n/a | self.assertEqual(issubclass(int, SubInt), False) |
|---|
| 61 | n/a | self.assertEqual(issubclass(int, (SubInt,)), False) |
|---|
| 62 | n/a | self.assertEqual(isinstance(SubInt(), Integer), True) |
|---|
| 63 | n/a | self.assertEqual(isinstance(SubInt(), (Integer,)), True) |
|---|
| 64 | n/a | self.assertEqual(isinstance(SubInt(), SubInt), True) |
|---|
| 65 | n/a | self.assertEqual(isinstance(SubInt(), (SubInt,)), True) |
|---|
| 66 | n/a | self.assertEqual(isinstance(42, SubInt), False) |
|---|
| 67 | n/a | self.assertEqual(isinstance(42, (SubInt,)), False) |
|---|
| 68 | n/a | |
|---|
| 69 | n/a | |
|---|
| 70 | n/a | if __name__ == "__main__": |
|---|
| 71 | n/a | unittest.main() |
|---|
