# Copyright 2014 MongoDB, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Test the monitor module."""

import gc
import sys
import time

sys.path[0:0] = [""]

from pymongo.monitor import MONITORS
from test import unittest, port, host, IntegrationTest
from test.utils import get_client, wait_until


class TestMonitor(IntegrationTest):
    def test_atexit_hook(self):
        n_monitors = len(MONITORS)
        client = get_client(host, port)
        wait_until(lambda: len(MONITORS) == n_monitors + 1,
                   'register new monitor')

        del client

        start = time.time()
        while time.time() - start < 30:
            gc.collect()
            if len(MONITORS) == n_monitors:
                break

            time.sleep(0.1)
        else:
            self.fail("Didn't ever unregister monitor")


if __name__ == "__main__":
    unittest.main()

@@ -871,17 +871,80 @@
         
-n
+# Weakrefs to currently running Monitor instances.%0A        prior
 _monitor
@@ -947,28 +947,24 @@
 itors = 
-len(
 MONITORS
 )%0A      
@@ -955,16 +955,22 @@
 MONITORS
+.copy(
 )%0A      
@@ -1030,28 +1030,24 @@
 lambda: 
-len(
 MONITORS
 ) == n_m
@@ -1030,38 +1030,40 @@
 lambda: MONITORS
-) == n
+ - prior
 _monitors + 1,%0A 
@@ -1059,12 +1059,8 @@
 tors
- + 1
 ,%0A  
@@ -1233,20 +1233,16 @@
  if 
-len(
 MONITORS
 ) ==
@@ -1241,14 +1241,16 @@
 TORS
-) == n
+ - prior
 _mon
@@ -1256,16 +1256,64 @@
 nitors:%0A
+                # New monitor was unregistered.%0A
         

Fix TestMonitor.test_atexit_hook.