| 4710c53d |
1 | """Unit tests for __instancecheck__ and __subclasscheck__."""\r |
| 2 | \r |
| 3 | import unittest\r |
| 4 | from test import test_support\r |
| 5 | \r |
| 6 | \r |
| 7 | class ABC(type):\r |
| 8 | \r |
| 9 | def __instancecheck__(cls, inst):\r |
| 10 | """Implement isinstance(inst, cls)."""\r |
| 11 | return any(cls.__subclasscheck__(c)\r |
| 12 | for c in set([type(inst), inst.__class__]))\r |
| 13 | \r |
| 14 | def __subclasscheck__(cls, sub):\r |
| 15 | """Implement issubclass(sub, cls)."""\r |
| 16 | candidates = cls.__dict__.get("__subclass__", set()) | set([cls])\r |
| 17 | return any(c in candidates for c in sub.mro())\r |
| 18 | \r |
| 19 | \r |
| 20 | class Integer:\r |
| 21 | \r |
| 22 | __metaclass__ = ABC\r |
| 23 | \r |
| 24 | __subclass__ = set([int])\r |
| 25 | \r |
| 26 | \r |
| 27 | class SubInt(Integer):\r |
| 28 | \r |
| 29 | pass\r |
| 30 | \r |
| 31 | \r |
| 32 | class TypeChecksTest(unittest.TestCase):\r |
| 33 | \r |
| 34 | def testIsSubclassInternal(self):\r |
| 35 | self.assertEqual(Integer.__subclasscheck__(int), True)\r |
| 36 | self.assertEqual(Integer.__subclasscheck__(float), False)\r |
| 37 | \r |
| 38 | def testIsSubclassBuiltin(self):\r |
| 39 | self.assertEqual(issubclass(int, Integer), True)\r |
| 40 | self.assertEqual(issubclass(int, (Integer,)), True)\r |
| 41 | self.assertEqual(issubclass(float, Integer), False)\r |
| 42 | self.assertEqual(issubclass(float, (Integer,)), False)\r |
| 43 | \r |
| 44 | def testIsInstanceBuiltin(self):\r |
| 45 | self.assertEqual(isinstance(42, Integer), True)\r |
| 46 | self.assertEqual(isinstance(42, (Integer,)), True)\r |
| 47 | self.assertEqual(isinstance(3.14, Integer), False)\r |
| 48 | self.assertEqual(isinstance(3.14, (Integer,)), False)\r |
| 49 | \r |
| 50 | def testIsInstanceActual(self):\r |
| 51 | self.assertEqual(isinstance(Integer(), Integer), True)\r |
| 52 | self.assertEqual(isinstance(Integer(), (Integer,)), True)\r |
| 53 | \r |
| 54 | def testIsSubclassActual(self):\r |
| 55 | self.assertEqual(issubclass(Integer, Integer), True)\r |
| 56 | self.assertEqual(issubclass(Integer, (Integer,)), True)\r |
| 57 | \r |
| 58 | def testSubclassBehavior(self):\r |
| 59 | self.assertEqual(issubclass(SubInt, Integer), True)\r |
| 60 | self.assertEqual(issubclass(SubInt, (Integer,)), True)\r |
| 61 | self.assertEqual(issubclass(SubInt, SubInt), True)\r |
| 62 | self.assertEqual(issubclass(SubInt, (SubInt,)), True)\r |
| 63 | self.assertEqual(issubclass(Integer, SubInt), False)\r |
| 64 | self.assertEqual(issubclass(Integer, (SubInt,)), False)\r |
| 65 | self.assertEqual(issubclass(int, SubInt), False)\r |
| 66 | self.assertEqual(issubclass(int, (SubInt,)), False)\r |
| 67 | self.assertEqual(isinstance(SubInt(), Integer), True)\r |
| 68 | self.assertEqual(isinstance(SubInt(), (Integer,)), True)\r |
| 69 | self.assertEqual(isinstance(SubInt(), SubInt), True)\r |
| 70 | self.assertEqual(isinstance(SubInt(), (SubInt,)), True)\r |
| 71 | self.assertEqual(isinstance(42, SubInt), False)\r |
| 72 | self.assertEqual(isinstance(42, (SubInt,)), False)\r |
| 73 | \r |
| 74 | def test_oldstyle(self):\r |
| 75 | # These should just be ignored.\r |
| 76 | class X:\r |
| 77 | def __instancecheck__(self, inst):\r |
| 78 | return True\r |
| 79 | def __subclasscheck__(self, cls):\r |
| 80 | return True\r |
| 81 | class Sub(X): pass\r |
| 82 | self.assertNotIsInstance(3, X)\r |
| 83 | self.assertIsInstance(X(), X)\r |
| 84 | self.assertFalse(issubclass(int, X))\r |
| 85 | self.assertTrue(issubclass(Sub, X))\r |
| 86 | \r |
| 87 | \r |
| 88 | def test_main():\r |
| 89 | test_support.run_unittest(TypeChecksTest)\r |
| 90 | \r |
| 91 | \r |
| 92 | if __name__ == "__main__":\r |
| 93 | unittest.main()\r |
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