Karthikeyan Singaravelan <tir.kar...@gmail.com> added the comment:

Sorry, I was wrong PYTHONWARNINGS environment variable is still passed to 
subprocess created by assert_python_ok so using assertWarns doesn't suppress 
it. Perhaps the DeprecationWarning could be ignored in assert_python_ok like 
below with -W :


diff --git a/Lib/test/test_asyncio/test_tasks.py 
b/Lib/test/test_asyncio/test_tasks.py
index 22a49077d5..d5f44b8091 100644
--- a/Lib/test/test_asyncio/test_tasks.py
+++ b/Lib/test/test_asyncio/test_tasks.py
@@ -3352,7 +3352,9 @@ class CompatibilityTests(test_utils.TestCase):

             asyncio.run(old_style_coro())
         """)
-        assert_python_ok("-c", code, PYTHONASYNCIODEBUG="1")
+
+        assert_python_ok("-Wignore::DeprecationWarning", "-c", code,
+                         PYTHONASYNCIODEBUG="1")


 if __name__ == '__main__':

----------

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<https://bugs.python.org/issue37323>
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