Skip test_coroutine_like_object_debug_formatting under Python < 3.5

Author: 1st1

tests/test_events.py

@@ -1,5 +1,6 @@
 """Tests for events.py."""
 
+import collections.abc
 import functools
 import gc
 import io
@@ -2381,6 +2382,8 @@ def check_source_traceback(h):
         h = loop.call_later(0, noop)
         check_source_traceback(h)
 
+    @unittest.skipUnless(hasattr(collections.abc, 'Coroutine'),
+                         'No collections.abc.Coroutine')
     def test_coroutine_like_object_debug_formatting(self):
         # Test that asyncio can format coroutines that are instances of
         # collections.abc.Coroutine, but lack cr_core or gi_code attributes