Issue #20555: Use specific asserts in urllib, httplib, ftplib, cgi, wsgiref tests.
diff --git a/Lib/test/test_urllib2net.py b/Lib/test/test_urllib2net.py
index d22b59e..4f81c28 100644
--- a/Lib/test/test_urllib2net.py
+++ b/Lib/test/test_urllib2net.py
@@ -80,11 +80,11 @@
         # delve deep into response to fetch socket._socketobject
         response = _urlopen_with_retry("http://www.python.org/")
         abused_fileobject = response.fp
-        self.assertTrue(abused_fileobject.__class__ is socket._fileobject)
+        self.assertIs(abused_fileobject.__class__, socket._fileobject)
         httpresponse = abused_fileobject._sock
-        self.assertTrue(httpresponse.__class__ is httplib.HTTPResponse)
+        self.assertIs(httpresponse.__class__, httplib.HTTPResponse)
         fileobject = httpresponse.fp
-        self.assertTrue(fileobject.__class__ is socket._fileobject)
+        self.assertIs(fileobject.__class__, socket._fileobject)
 
         self.assertTrue(not fileobject.closed)
         response.close()
@@ -250,14 +250,14 @@
 
 class TimeoutTest(unittest.TestCase):
     def test_http_basic(self):
-        self.assertTrue(socket.getdefaulttimeout() is None)
+        self.assertIsNone(socket.getdefaulttimeout())
         url = "http://www.python.org"
         with test_support.transient_internet(url, timeout=None):
             u = _urlopen_with_retry(url)
-            self.assertTrue(u.fp._sock.fp._sock.gettimeout() is None)
+            self.assertIsNone(u.fp._sock.fp._sock.gettimeout())
 
     def test_http_default_timeout(self):
-        self.assertTrue(socket.getdefaulttimeout() is None)
+        self.assertIsNone(socket.getdefaulttimeout())
         url = "http://www.python.org"
         with test_support.transient_internet(url):
             socket.setdefaulttimeout(60)
@@ -268,7 +268,7 @@
             self.assertEqual(u.fp._sock.fp._sock.gettimeout(), 60)
 
     def test_http_no_timeout(self):
-        self.assertTrue(socket.getdefaulttimeout() is None)
+        self.assertIsNone(socket.getdefaulttimeout())
         url = "http://www.python.org"
         with test_support.transient_internet(url):
             socket.setdefaulttimeout(60)
@@ -276,7 +276,7 @@
                 u = _urlopen_with_retry(url, timeout=None)
             finally:
                 socket.setdefaulttimeout(None)
-            self.assertTrue(u.fp._sock.fp._sock.gettimeout() is None)
+            self.assertIsNone(u.fp._sock.fp._sock.gettimeout())
 
     def test_http_timeout(self):
         url = "http://www.python.org"
@@ -287,13 +287,13 @@
     FTP_HOST = "ftp://ftp.mirror.nl/pub/gnu/"
 
     def test_ftp_basic(self):
-        self.assertTrue(socket.getdefaulttimeout() is None)
+        self.assertIsNone(socket.getdefaulttimeout())
         with test_support.transient_internet(self.FTP_HOST, timeout=None):
             u = _urlopen_with_retry(self.FTP_HOST)
-            self.assertTrue(u.fp.fp._sock.gettimeout() is None)
+            self.assertIsNone(u.fp.fp._sock.gettimeout())
 
     def test_ftp_default_timeout(self):
-        self.assertTrue(socket.getdefaulttimeout() is None)
+        self.assertIsNone(socket.getdefaulttimeout())
         with test_support.transient_internet(self.FTP_HOST):
             socket.setdefaulttimeout(60)
             try:
@@ -303,14 +303,14 @@
             self.assertEqual(u.fp.fp._sock.gettimeout(), 60)
 
     def test_ftp_no_timeout(self):
-        self.assertTrue(socket.getdefaulttimeout() is None)
+        self.assertIsNone(socket.getdefaulttimeout(),)
         with test_support.transient_internet(self.FTP_HOST):
             socket.setdefaulttimeout(60)
             try:
                 u = _urlopen_with_retry(self.FTP_HOST, timeout=None)
             finally:
                 socket.setdefaulttimeout(None)
-            self.assertTrue(u.fp.fp._sock.gettimeout() is None)
+            self.assertIsNone(u.fp.fp._sock.gettimeout())
 
     def test_ftp_timeout(self):
         with test_support.transient_internet(self.FTP_HOST):