diff --git a/Lib/test/test_asyncio/test_pep492.py b/Lib/test/test_asyncio/test_pep492.py
index e25e257..8fc6cba 100644
--- a/Lib/test/test_asyncio/test_pep492.py
+++ b/Lib/test/test_asyncio/test_pep492.py
@@ -97,18 +97,14 @@
         finally:
             f.close() # silence warning
 
-        class FakeCoro(collections.abc.Coroutine):
+        # Test that asyncio.iscoroutine() uses collections.abc.Coroutine
+        class FakeCoro:
             def send(self, value): pass
             def throw(self, typ, val=None, tb=None): pass
+            def close(self): pass
+            def __await__(self): yield
 
-        fc = FakeCoro()
-        try:
-            self.assertTrue(asyncio.iscoroutine(fc))
-        finally:
-            # To make sure that ABCMeta caches are freed
-            # from FakeCoro ASAP.
-            fc = FakeCoro = None
-            support.gc_collect()
+        self.assertTrue(asyncio.iscoroutine(FakeCoro()))
 
 
 if __name__ == '__main__':
diff --git a/Lib/test/test_collections.py b/Lib/test/test_collections.py
index ec86466..dc79b69 100644
--- a/Lib/test/test_collections.py
+++ b/Lib/test/test_collections.py
@@ -496,6 +496,8 @@
                 return value
             def throw(self, typ, val=None, tb=None):
                 super().throw(typ, val, tb)
+            def __await__(self):
+                yield
 
         non_samples = [None, int(), gen(), object()]
         for x in non_samples:
@@ -515,13 +517,7 @@
         self.assertIsInstance(c, Awaitable)
         c.close() # awoid RuntimeWarning that coro() was not awaited
 
-        class CoroLike:
-            def send(self, value):
-                pass
-            def throw(self, typ, val=None, tb=None):
-                pass
-            def close(self):
-                pass
+        class CoroLike: pass
         Coroutine.register(CoroLike)
         self.assertTrue(isinstance(CoroLike(), Awaitable))
         self.assertTrue(issubclass(CoroLike, Awaitable))
@@ -548,6 +544,8 @@
                 return value
             def throw(self, typ, val=None, tb=None):
                 super().throw(typ, val, tb)
+            def __await__(self):
+                yield
 
         non_samples = [None, int(), gen(), object(), Bar()]
         for x in non_samples:
@@ -567,6 +565,28 @@
         self.assertIsInstance(c, Coroutine)
         c.close() # awoid RuntimeWarning that coro() was not awaited
 
+        class CoroLike:
+            def send(self, value):
+                pass
+            def throw(self, typ, val=None, tb=None):
+                pass
+            def close(self):
+                pass
+            def __await__(self):
+                pass
+        self.assertTrue(isinstance(CoroLike(), Coroutine))
+        self.assertTrue(issubclass(CoroLike, Coroutine))
+
+        class CoroLike:
+            def send(self, value):
+                pass
+            def close(self):
+                pass
+            def __await__(self):
+                pass
+        self.assertFalse(isinstance(CoroLike(), Coroutine))
+        self.assertFalse(issubclass(CoroLike, Coroutine))
+
     def test_Hashable(self):
         # Check some non-hashables
         non_samples = [bytearray(), list(), set(), dict()]