Try fix 3.6 tests

tests/unit/providers/test_coroutines_py3.py

@@ -1,7 +1,7 @@
 """Dependency injector coroutine providers unit tests."""
 
 import asyncio
-from asyncio import coroutines, events, tasks
+from asyncio import coroutines, events
 
 import unittest2 as unittest
 
@@ -34,35 +34,12 @@ def _run(coro, debug=False):
         return loop.run_until_complete(coro)
     finally:
         try:
-            _cancel_all_tasks(loop)
             loop.run_until_complete(loop.shutdown_asyncgens())
         finally:
             events.set_event_loop(None)
             loop.close()
 
 
-def _cancel_all_tasks(loop):
-    to_cancel = tasks.all_tasks(loop)
-    if not to_cancel:
-        return
-
-    for task in to_cancel:
-        task.cancel()
-
-    loop.run_until_complete(
-        tasks.gather(*to_cancel, loop=loop, return_exceptions=True))
-
-    for task in to_cancel:
-        if task.cancelled():
-            continue
-        if task.exception() is not None:
-            loop.call_exception_handler({
-                'message': 'unhandled exception during asyncio.run() shutdown',
-                'exception': task.exception(),
-                'task': task,
-            })
-
-
 class CoroutineTests(unittest.TestCase):
 
     def test_init_with_coroutine(self):