1  """Unit tests for __instancecheck__ and __subclasscheck__."""
       2  
       3  import unittest
       4  
       5  
       6  class ESC[4;38;5;81mABC(ESC[4;38;5;149mtype):
       7  
       8      def __instancecheck__(cls, inst):
       9          """Implement isinstance(inst, cls)."""
      10          return any(cls.__subclasscheck__(c)
      11                     for c in {type(inst), inst.__class__})
      12  
      13      def __subclasscheck__(cls, sub):
      14          """Implement issubclass(sub, cls)."""
      15          candidates = cls.__dict__.get("__subclass__", set()) | {cls}
      16          return any(c in candidates for c in sub.mro())
      17  
      18  
      19  class ESC[4;38;5;81mInteger(metaclass=ESC[4;38;5;149mABC):
      20      __subclass__ = {int}
      21  
      22  
      23  class ESC[4;38;5;81mSubInt(ESC[4;38;5;149mInteger):
      24      pass
      25  
      26  
      27  class ESC[4;38;5;81mTypeChecksTest(ESC[4;38;5;149munittestESC[4;38;5;149m.ESC[4;38;5;149mTestCase):
      28  
      29      def testIsSubclassInternal(self):
      30          self.assertEqual(Integer.__subclasscheck__(int), True)
      31          self.assertEqual(Integer.__subclasscheck__(float), False)
      32  
      33      def testIsSubclassBuiltin(self):
      34          self.assertEqual(issubclass(int, Integer), True)
      35          self.assertEqual(issubclass(int, (Integer,)), True)
      36          self.assertEqual(issubclass(float, Integer), False)
      37          self.assertEqual(issubclass(float, (Integer,)), False)
      38  
      39      def testIsInstanceBuiltin(self):
      40          self.assertEqual(isinstance(42, Integer), True)
      41          self.assertEqual(isinstance(42, (Integer,)), True)
      42          self.assertEqual(isinstance(3.14, Integer), False)
      43          self.assertEqual(isinstance(3.14, (Integer,)), False)
      44  
      45      def testIsInstanceActual(self):
      46          self.assertEqual(isinstance(Integer(), Integer), True)
      47          self.assertEqual(isinstance(Integer(), (Integer,)), True)
      48  
      49      def testIsSubclassActual(self):
      50          self.assertEqual(issubclass(Integer, Integer), True)
      51          self.assertEqual(issubclass(Integer, (Integer,)), True)
      52  
      53      def testSubclassBehavior(self):
      54          self.assertEqual(issubclass(SubInt, Integer), True)
      55          self.assertEqual(issubclass(SubInt, (Integer,)), True)
      56          self.assertEqual(issubclass(SubInt, SubInt), True)
      57          self.assertEqual(issubclass(SubInt, (SubInt,)), True)
      58          self.assertEqual(issubclass(Integer, SubInt), False)
      59          self.assertEqual(issubclass(Integer, (SubInt,)), False)
      60          self.assertEqual(issubclass(int, SubInt), False)
      61          self.assertEqual(issubclass(int, (SubInt,)), False)
      62          self.assertEqual(isinstance(SubInt(), Integer), True)
      63          self.assertEqual(isinstance(SubInt(), (Integer,)), True)
      64          self.assertEqual(isinstance(SubInt(), SubInt), True)
      65          self.assertEqual(isinstance(SubInt(), (SubInt,)), True)
      66          self.assertEqual(isinstance(42, SubInt), False)
      67          self.assertEqual(isinstance(42, (SubInt,)), False)
      68  
      69  
      70  if __name__ == "__main__":
      71      unittest.main()