From: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>
Date: Tue, 16 Aug 2022 15:52:06 +0000 (+0530)
Subject: GH-95736: fix IsolatedAsyncioTestCase to initialize Runner before calling setup funct... 
X-Git-Tag: v3.12.0a1~638
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=9d515997f943b7b510268448f372dabcbf957858;p=thirdparty%2FPython%2Fcpython.git

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

diff --git a/Lib/test/test_unittest/test_async_case.py b/Lib/test/test_unittest/test_async_case.py
index beadcac070b4..f59fc760d381 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()
diff --git a/Lib/unittest/async_case.py b/Lib/unittest/async_case.py
index a90eed98f871..8b06fad06209 100644
--- a/Lib/unittest/async_case.py
+++ b/Lib/unittest/async_case.py
@@ -116,6 +116,10 @@ class IsolatedAsyncioTestCase(TestCase):
         assert self._asyncioRunner is None, 'asyncio runner is already initialized'
         runner = asyncio.Runner(debug=True)
         self._asyncioRunner = runner
+        # Force loop to be initialized and set as the current loop
+        # so that setUp functions can use get_event_loop() and get the
+        # correct loop instance.
+        runner.get_loop()
 
     def _tearDownAsyncioRunner(self):
         runner = self._asyncioRunner
diff --git a/Misc/NEWS.d/next/Library/2022-08-11-18-22-29.gh-issue-95736.LzRZXe.rst b/Misc/NEWS.d/next/Library/2022-08-11-18-22-29.gh-issue-95736.LzRZXe.rst
new file mode 100644
index 000000000000..abc270fe35ca
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2022-08-11-18-22-29.gh-issue-95736.LzRZXe.rst
@@ -0,0 +1 @@
+Fix :class:`unittest.IsolatedAsyncioTestCase` to set event loop before calling setup functions. Patch by Kumar Aditya.