Convert urllib.request parse_proxy doctests to unittests.

Lib/test/test_urllib2.py

@@ -10,7 +10,7 @@ import sys
 import urllib.request
 # The proxy bypass method imported below has logic specific to the OSX
 # proxy config data structure but is testable on all platforms.
-from urllib.request import Request, OpenerDirector, _proxy_bypass_macosx_sysconf
+from urllib.request import Request, OpenerDirector, _parse_proxy, _proxy_bypass_macosx_sysconf
 from urllib.parse import urlparse
 import urllib.error
 
@@ -1467,6 +1467,43 @@ class MiscTests(unittest.TestCase):
         expected_errmsg = 'HTTP Error %s: %s' % (err.code, err.msg)
         self.assertEqual(str(err), expected_errmsg)
 
+    def test_parse_proxy(self):
+        parse_proxy_test_cases = [
+            ('proxy.example.com',
+             (None, None, None, 'proxy.example.com')),
+            ('proxy.example.com:3128',
+             (None, None, None, 'proxy.example.com:3128')),
+            ('proxy.example.com', (None, None, None, 'proxy.example.com')),
+            ('proxy.example.com:3128',
+             (None, None, None, 'proxy.example.com:3128')),
+            # The authority component may optionally include userinfo
+            # (assumed to be # username:password):
+            ('joe:password@proxy.example.com',
+             (None, 'joe', 'password', 'proxy.example.com')),
+            ('joe:password@proxy.example.com:3128',
+             (None, 'joe', 'password', 'proxy.example.com:3128')),
+            #Examples with URLS
+            ('http://proxy.example.com/',
+             ('http', None, None, 'proxy.example.com')),
+            ('http://proxy.example.com:3128/',
+             ('http', None, None, 'proxy.example.com:3128')),
+            ('http://joe:password@proxy.example.com/',
+             ('http', 'joe', 'password', 'proxy.example.com')),
+            ('http://joe:password@proxy.example.com:3128',
+             ('http', 'joe', 'password', 'proxy.example.com:3128')),
+            # Everything after the authority is ignored
+            ('ftp://joe:password@proxy.example.com/rubbish:3128',
+             ('ftp', 'joe', 'password', 'proxy.example.com')),
+            # Test for no trailing '/' case
+            ('http://joe:password@proxy.example.com',
+             ('http', 'joe', 'password', 'proxy.example.com'))
+        ]
+
+        for tc, expected in parse_proxy_test_cases:
+            self.assertEqual(_parse_proxy(tc), expected)
+
+        self.assertRaises(ValueError, _parse_proxy, 'file:/ftp.example.com'),
+
 class RequestTests(unittest.TestCase):
     class PutRequest(Request):
         method='PUT'