fix tests

Author: kumaraditya303

Lib/test/test_asyncio/test_tasks.py

@@ -2757,7 +2757,6 @@ async def func():
     # Add patched Task & Future back to the test case
     cls.Task = Task
     cls.Future = Future
-    cls.all_tasks = tasks.all_tasks
 
     # Add an extra unit-test
     cls.test_subclasses_ctask_cfuture = test_subclasses_ctask_cfuture
@@ -2883,7 +2882,7 @@ class PyTask_CFutureSubclass_Tests(BaseTaskTests, test_utils.TestCase):
 
     Future = getattr(futures, '_CFuture', None)
     Task = tasks._PyTask
-    all_tasks = tasks._py_all_tasks
+    all_tasks = staticmethod(tasks._py_all_tasks)
 
 
 @unittest.skipUnless(hasattr(tasks, '_CTask'),
@@ -2916,7 +2915,7 @@ class PyTask_PyFuture_Tests(BaseTaskTests, SetMethodsTest,
 class PyTask_PyFuture_SubclassTests(BaseTaskTests, test_utils.TestCase):
     Task = tasks._PyTask
     Future = futures._PyFuture
-
+    all_tasks = staticmethod(tasks._py_all_tasks)
 
 @unittest.skipUnless(hasattr(tasks, '_CTask'),
                      'requires the C _asyncio module')