diff --git a/Lib/test/test_collections.py b/Lib/test/test_collections.py
index 467ddef708e..067c537997d 100644
--- a/Lib/test/test_collections.py
+++ b/Lib/test/test_collections.py
@@ -235,6 +235,17 @@ class ABCTestCase(unittest.TestCase):
             C = type('C', (abc,), stubs)
             self.assertRaises(TypeError, C, name)
 
+    def validate_isinstance(self, abc, name):
+        stub = lambda s, *args: 0
+
+        C = type('C', (object,), {'__hash__': None})
+        setattr(C, name, stub)
+        self.assertIsInstance(C(), abc)
+        self.assertTrue(issubclass(C, abc))
+
+        C = type('C', (object,), {'__hash__': None})
+        self.assertNotIsInstance(C(), abc)
+        self.assertFalse(issubclass(C, abc))
 
 class TestOneTrickPonyABCs(ABCTestCase):
 
@@ -262,6 +273,7 @@ class TestOneTrickPonyABCs(ABCTestCase):
         self.assertEqual(hash(H()), 0)
         self.assertFalse(issubclass(int, H))
         self.validate_abstract_methods(Hashable, '__hash__')
+        self.validate_isinstance(Hashable, '__hash__')
 
     def test_Iterable(self):
         # Check some non-iterables
@@ -286,6 +298,7 @@ class TestOneTrickPonyABCs(ABCTestCase):
         self.assertEqual(list(I()), [])
         self.assertFalse(issubclass(str, I))
         self.validate_abstract_methods(Iterable, '__iter__')
+        self.validate_isinstance(Iterable, '__iter__')
 
     def test_Iterator(self):
         non_samples = [None, 42, 3.14, 1j, b"", "", (), [], {}, set()]
@@ -304,6 +317,7 @@ class TestOneTrickPonyABCs(ABCTestCase):
             self.assertIsInstance(x, Iterator)
             self.assertTrue(issubclass(type(x), Iterator), repr(type(x)))
         self.validate_abstract_methods(Iterator, '__next__')
+        self.validate_isinstance(Iterator, '__next__')
 
     def test_Sized(self):
         non_samples = [None, 42, 3.14, 1j,
@@ -321,6 +335,7 @@ class TestOneTrickPonyABCs(ABCTestCase):
             self.assertIsInstance(x, Sized)
             self.assertTrue(issubclass(type(x), Sized), repr(type(x)))
         self.validate_abstract_methods(Sized, '__len__')
+        self.validate_isinstance(Sized, '__len__')
 
     def test_Container(self):
         non_samples = [None, 42, 3.14, 1j,
@@ -338,6 +353,7 @@ class TestOneTrickPonyABCs(ABCTestCase):
             self.assertIsInstance(x, Container)
             self.assertTrue(issubclass(type(x), Container), repr(type(x)))
         self.validate_abstract_methods(Container, '__contains__')
+        self.validate_isinstance(Container, '__contains__')
 
     def test_Callable(self):
         non_samples = [None, 42, 3.14, 1j,
@@ -357,6 +373,7 @@ class TestOneTrickPonyABCs(ABCTestCase):
             self.assertIsInstance(x, Callable)
             self.assertTrue(issubclass(type(x), Callable), repr(type(x)))
         self.validate_abstract_methods(Callable, '__call__')
+        self.validate_isinstance(Callable, '__call__')
 
     def test_direct_subclassing(self):
         for B in Hashable, Iterable, Iterator, Sized, Container, Callable: