[Bug #1575506] The _singlefileMailbox class was using the wrong file object in its flush() method, causing an error
diff --git a/Lib/test/test_mailbox.py b/Lib/test/test_mailbox.py
index 6cdc441..40cf192 100644
--- a/Lib/test/test_mailbox.py
+++ b/Lib/test/test_mailbox.py
@@ -747,6 +747,22 @@
self._box.lock()
self._box.unlock()
+ def test_relock(self):
+ # Test case for bug #1575506: the mailbox class was locking the
+ # wrong file object in its flush() method.
+ msg = "Subject: sub\n\nbody\n"
+ key1 = self._box.add(msg)
+ self._box.flush()
+ self._box.close()
+
+ self._box = self._factory(self._path)
+ self._box.lock()
+ key2 = self._box.add(msg)
+ self._box.flush()
+ self.assert_(self._box._locked)
+ self._box.close()
+
+
class TestMbox(_TestMboxMMDF):