Document workarounds

Author: Erlend E. Aasland

Lib/sqlite3/test/dbapi.py

@@ -173,6 +173,7 @@ def test_in_transaction_ro(self):
 
 class OpenTests(unittest.TestCase):
     def tearDown(self):
+        # bpo-42213: ensure that TESTFN is closed before unlinking
         import gc
         gc.collect()
         unlink(TESTFN)

Lib/sqlite3/test/hooks.py

@@ -261,6 +261,7 @@ def trace(statement):
         cur.execute(queries[1])
         self.assertEqual(traced_statements, queries)
 
+        # bpo-42213: ensure that TESTFN is closed before the cleanup runs
         con1.close()
         con2.close()
         import gc