Do not try to use ProactorEventLoop() on non Windows platforms.

tests/conftest.py

@@ -22,15 +22,16 @@ from .handlers.api.base import Query
 sys._called_from_test = True
 sys.original_platform = sys.platform
 
-@pytest.mark.skipif(not sys.platform.startswith("win"), reason="asyncio.ProactorEventLoop() is Only supported on Windows")
-@pytest.yield_fixture(scope="session")
-def loop(request):
-    """Return an event loop and destroy it at the end of test"""
 
-    loop = asyncio.ProactorEventLoop()
+if sys.platform.startswith("win"):
-    asyncio.set_event_loop(loop)  # Replace main loop to avoid conflict between tests
+    @pytest.yield_fixture(scope="session")
-    yield loop
+    def loop(request):
-    asyncio.set_event_loop(None)
+        """Return an event loop and destroy it at the end of test"""
+
+        loop = asyncio.ProactorEventLoop()
+        asyncio.set_event_loop(loop)  # Replace main loop to avoid conflict between tests
+        yield loop
+        asyncio.set_event_loop(None)
 
 
 @pytest.fixture(scope='function')