[3.7] bpo-37035: Don't log OSError (GH-13548) (#13594)

https://bugs.python.org/issue37035.
(cherry picked from commit 1f39c28e489cca0397fc4c3675d13569318122ac)

Co-authored-by: Andrew Svetlov <andrew.svetlov@gmail.com>

2 files changed, 26 insertions, 7 deletions

diff --git a/Lib/test/test_asyncio/test_selector_events.py b/Lib/test/test_asyncio/test_selector_events.py
index 2205ee2042..a9fb61ae99 100644
--- a/Lib/test/test_asyncio/test_selector_events.py
+++ b/Lib/test/test_asyncio/test_selector_events.py
@@ -850,10 +850,23 @@ class SelectorTransportTests(test_utils.TestCase):
         tr._force_close = mock.Mock()
         tr._fatal_error(exc)
 
+        m_exc.assert_not_called()
+
+        tr._force_close.assert_called_with(exc)
+
+    @mock.patch('asyncio.log.logger.error')
+    def test_fatal_error_custom_exception(self, m_exc):
+        class MyError(Exception):
+            pass
+        exc = MyError()
+        tr = self.create_transport()
+        tr._force_close = mock.Mock()
+        tr._fatal_error(exc)
+
         m_exc.assert_called_with(
             test_utils.MockPattern(
                 'Fatal error on transport\nprotocol:.*\ntransport:.*'),
-            exc_info=(OSError, MOCK_ANY, MOCK_ANY))
+            exc_info=(MyError, MOCK_ANY, MOCK_ANY))
 
         tr._force_close.assert_called_with(exc)
 
@@ -1740,10 +1753,20 @@ class SelectorDatagramTransportTests(test_utils.TestCase):
         err = ConnectionRefusedError()
         transport._fatal_error(err)
         self.assertFalse(self.protocol.error_received.called)
+        m_exc.assert_not_called()
+
+    @mock.patch('asyncio.base_events.logger.error')
+    def test_fatal_error_connected_custom_error(self, m_exc):
+        class MyException(Exception):
+            pass
+        transport = self.datagram_transport(address=('0.0.0.0', 1))
+        err = MyException()
+        transport._fatal_error(err)
+        self.assertFalse(self.protocol.error_received.called)
         m_exc.assert_called_with(
             test_utils.MockPattern(
                 'Fatal error on transport\nprotocol:.*\ntransport:.*'),
-            exc_info=(ConnectionRefusedError, MOCK_ANY, MOCK_ANY))
+            exc_info=(MyException, MOCK_ANY, MOCK_ANY))
 
 
 if __name__ == '__main__':
diff --git a/Lib/test/test_asyncio/test_unix_events.py b/Lib/test/test_asyncio/test_unix_events.py
index 5d16b95456..ec171fa83d 100644
--- a/Lib/test/test_asyncio/test_unix_events.py
+++ b/Lib/test/test_asyncio/test_unix_events.py
@@ -961,11 +961,7 @@ class UnixWritePipeTransportTests(test_utils.TestCase):
         self.assertFalse(self.loop.readers)
         self.assertEqual(bytearray(), tr._buffer)
         self.assertTrue(tr.is_closing())
-        m_logexc.assert_called_with(
-            test_utils.MockPattern(
-                'Fatal write error on pipe transport'
-                '\nprotocol:.*\ntransport:.*'),
-            exc_info=(OSError, MOCK_ANY, MOCK_ANY))
+        m_logexc.assert_not_called()
         self.assertEqual(1, tr._conn_lost)
         test_utils.run_briefly(self.loop)
         self.protocol.connection_lost.assert_called_with(err)