GH-95736: fix IsolatedAsyncioTestCase to initialize Runner before calling setup functions (#95898)

1 files changed, 15 insertions, 0 deletions

diff --git a/Lib/test/test_unittest/test_async_case.py b/Lib/test/test_unittest/test_async_case.py
index beadcac..f59fc76 100644
--- a/Lib/test/test_unittest/test_async_case.py
+++ b/Lib/test/test_unittest/test_async_case.py
@@ -434,6 +434,21 @@ class TestAsyncCase(unittest.TestCase):
         test.doCleanups()
         self.assertEqual(events, ['asyncSetUp', 'test', 'cleanup'])
 
+    def test_setup_get_event_loop(self):
+        # See https://github.com/python/cpython/issues/95736
+        # Make sure the default event loop is not used
+        asyncio.set_event_loop(None)
+
+        class TestCase1(unittest.IsolatedAsyncioTestCase):
+            def setUp(self):
+                asyncio.get_event_loop_policy().get_event_loop()
+
+            async def test_demo1(self):
+                pass
+
+        test = TestCase1('test_demo1')
+        result = test.run()
+        self.assertTrue(result.wasSuccessful())
 
 if __name__ == "__main__":
     unittest.main()