Update test_run.py

Author: johnzhou721

tests/test_run.py

@@ -5,19 +5,27 @@
 
 import qasync
 
-
-def test_run_with_contextmanager(application):
+@pytest.fixture
+def get_event_loop_coro(expected_loop):
     async def coro():
         event_loop = asyncio.get_event_loop()
-        assert (
-            type(event_loop).__name__ == "QIOCPEventLoop"
-            if os.name == "nt"
-            else "QSelectorEventLoop"
-        )
+        
+        assert type(event_loop).__name__ == expected_loop
         await asyncio.sleep(0)
+    return coro
+
+@pytest.fixture
+def expected_loop():
+    return "QIOCPEventLoop" if os.name == "nt" else "QSelectorEventLoop"
 
+def test_run_with_contextmanager(get_event_loop_coro):
     asyncio.set_event_loop(None)
-    qasync.run(coro())
+    qasync.run(get_event_loop_coro())
 
     with pytest.raises(RuntimeError):
         _ = asyncio.get_event_loop()
+
+def test_run_with_existing_eventloop(get_event_loop_coro, expected_loop):
+    asyncio.set_event_loop(asyncio.new_event_loop())
+    qasync.run(get_event_loop_coro())
+    assert asyncio.get_event_loop() != expected_loop