Address Review Comments.

* Use mock.patch.object instead of settting the module level value.
* Used test values to assert the debuglevel.

Author: orsenthil

Lib/test/test_urllib2.py

@@ -3,6 +3,7 @@
 from test.support import os_helper
 from test.support import warnings_helper
 from test import test_urllib
+from unittest import mock
 
 import os
 import io
@@ -483,6 +484,7 @@ def build_test_opener(*handler_instances):
         opener.add_handler(h)
     return opener
 
+
 class MockHTTPHandler(urllib.request.HTTPHandler):
     # Very simple mock HTTP handler with no special behavior other than using a mock HTTP connection
 
@@ -493,6 +495,7 @@ def __init__(self, debuglevel=None):
     def http_open(self, req):
         return self.do_open(self.httpconn, req)
 
+
 class MockHTTPHandlerRedirect(urllib.request.BaseHandler):
     # useful for testing redirections and auth
     # sends supplied headers and code as first response
@@ -1058,34 +1061,34 @@ def test_http_body_array(self):
             self.assertEqual(int(newreq.get_header('Content-length')),16)
 
     def test_http_handler_global_debuglevel(self):
-        http.client.HTTPConnection.debuglevel = 1
-        o = OpenerDirector()
-        h = MockHTTPHandler()
-        o.add_handler(h)
-        o.open("http://www.example.com")
-        self.assertEqual(h._debuglevel, 1)
+        with mock.patch.object(http.client.HTTPConnection, 'debuglevel', 6):
+            o = OpenerDirector()
+            h = MockHTTPHandler()
+            o.add_handler(h)
+            o.open("http://www.example.com")
+            self.assertEqual(h._debuglevel, 6)
 
     def test_http_handler_local_debuglevel(self):
         o = OpenerDirector()
-        h = MockHTTPHandler(debuglevel=1)
+        h = MockHTTPHandler(debuglevel=5)
         o.add_handler(h)
         o.open("http://www.example.com")
-        self.assertEqual(h._debuglevel, 1)
+        self.assertEqual(h._debuglevel, 5)
 
     def test_https_handler_global_debuglevel(self):
-        http.client.HTTPSConnection.debuglevel = 1
-        o = OpenerDirector()
-        h = MockHTTPSHandler()
-        o.add_handler(h)
-        o.open("https://www.example.com")
-        self.assertEqual(h._debuglevel, 1)
+        with mock.patch.object(http.client.HTTPSConnection, 'debuglevel', 7):
+            o = OpenerDirector()
+            h = MockHTTPSHandler()
+            o.add_handler(h)
+            o.open("https://www.example.com")
+            self.assertEqual(h._debuglevel, 7)
 
     def test_https_handler_local_debuglevel(self):
         o = OpenerDirector()
-        h = MockHTTPSHandler(debuglevel=1)
+        h = MockHTTPSHandler(debuglevel=4)
         o.add_handler(h)
         o.open("https://www.example.com")
-        self.assertEqual(h._debuglevel, 1)
+        self.assertEqual(h._debuglevel, 4)
 
     def test_http_doubleslash(self):
         # Checks the presence of any unnecessary double slash in url does not