Fix test failed on Python 3.4

Fix #1045

tests/utils.py

@@ -16,9 +16,9 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import io
+import types
 import asyncio
 import unittest.mock
-import collections.abc
 
 
 class _asyncio_patch:
@@ -70,7 +70,7 @@ class AsyncioMagicMock(unittest.mock.MagicMock):
     """
     Magic mock returning coroutine
     """
-    __class__ = collections.abc.Awaitable
+    __class__ = types.CoroutineType
 
     def __init__(self, return_value=None, return_values=None, **kwargs):
         """