bpo-37223, test_io: silence last 'Exception ignored in:' (GH-14029)

vstinner · web-flow · commit 913fa1c8245d · 2019-06-12T23:57:11.000+02:00
Use catch_unraisable_exception() to ignore 'Exception ignored in:'
error when the internal BufferedWriter of the BufferedRWPair is
destroyed. The C implementation doesn't give access to the
internal BufferedWriter, so just ignore the warning instead.
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
@@ -2070,6 +2070,11 @@ def writer_close():
 
         # Silence destructor error
         writer.close = lambda: None
+        writer = None
+
+        with support.catch_unraisable_exception():
+            pair = None
+            support.gc_collect()
 
     def test_reader_writer_close_error_on_close(self):
         def reader_close():
