Clean up properly.

Author: Tinche

pytest_asyncio/plugin.py

@@ -78,7 +78,9 @@ def pytest_fixture_setup(fixturedef, request):
                 asyncio.get_child_watcher().attach_loop(loop)
                 fixturedef.addfinalizer(lambda: asyncio.set_event_loop_policy(policy))
             else:
+                old_loop = policy.get_event_loop()
                 policy.set_event_loop(loop)
+                fixturedef.addfinalizer(lambda: policy.set_event_loop(old_loop))
 
 
 @asyncio.coroutine

tests/test_event_loop_scope.py

@@ -0,0 +1,21 @@
+"""Test the event loop fixture is properly disposed of.
+
+These tests need to be run together.
+"""
+import asyncio
+import pytest
+
+
+def test_1():
+    loop = asyncio.get_event_loop()
+    assert not loop.is_closed()
+
+
+@pytest.mark.asyncio
+async def test_2():
+    pass
+
+
+def test_3():
+    loop = asyncio.get_event_loop()
+    assert not loop.is_closed()