bpo-37421: urllib.request tests call urlcleanup() (GH-14529)

urllib.request tests now call urlcleanup() to remove temporary files
created by urlretrieve() tests and to clear the _opener global
variable set by urlopen() and functions calling indirectly urlopen().

regrtest now checks if urllib.request._url_tempfiles and
urllib.request._opener are changed by tests.

Lib/test/libregrtest/save_env.py

@@ -7,6 +7,7 @@ import shutil
 import sys
 import sysconfig
 import threading
+import urllib.request
 import warnings
 from test import support
 from test.libregrtest.utils import print_warning
@@ -68,8 +69,20 @@ class saved_test_environment:
                  'files', 'locale', 'warnings.showwarning',
                  'shutil_archive_formats', 'shutil_unpack_formats',
                  'asyncio.events._event_loop_policy',
+                 'urllib.requests._url_tempfiles', 'urllib.requests._opener',
                 )
 
+    def get_urllib_requests__url_tempfiles(self):
+        return list(urllib.request._url_tempfiles)
+    def restore_urllib_requests__url_tempfiles(self, tempfiles):
+        for filename in tempfiles:
+            support.unlink(filename)
+
+    def get_urllib_requests__opener(self):
+        return urllib.request._opener
+    def restore_urllib_requests__opener(self, opener):
+        urllib.request._opener = opener
+
     def get_asyncio_events__event_loop_policy(self):
         return support.maybe_get_event_loop_policy()
     def restore_asyncio_events__event_loop_policy(self, policy):

Lib/test/test_robotparser.py

@@ -309,6 +309,9 @@ class RobotHandler(BaseHTTPRequestHandler):
 class PasswordProtectedSiteTestCase(unittest.TestCase):
 
     def setUp(self):
+        # clear _opener global variable
+        self.addCleanup(urllib.request.urlcleanup)
+
         self.server = HTTPServer((support.HOST, 0), RobotHandler)
 
         self.t = threading.Thread(

Lib/test/test_sax.py

@@ -20,6 +20,7 @@ import codecs
 import os.path
 import shutil
 from urllib.error import URLError
+import urllib.request
 from test import support
 from test.support import findfile, run_unittest, FakePath, TESTFN
 
@@ -979,6 +980,9 @@ class ExpatReaderTest(XmlTestBase):
         self.assertEqual(handler._entities, [("img", None, "expat.gif", "GIF")])
 
     def test_expat_external_dtd_enabled(self):
+        # clear _opener global variable
+        self.addCleanup(urllib.request.urlcleanup)
+
         parser = create_parser()
         parser.setFeature(feature_external_ges, True)
         resolver = self.TestEntityRecorder()

Lib/test/test_urllib.py

@@ -545,6 +545,9 @@ class urlopen_DataTests(unittest.TestCase):
     """Test urlopen() opening a data URL."""
 
     def setUp(self):
+        # clear _opener global variable
+        self.addCleanup(urllib.request.urlcleanup)
+
         # text containing URL special- and unicode-characters
         self.text = "test data URLs :;,%=& \u00f6 \u00c4 "
         # 2x1 pixel RGB PNG image with one black and one white pixel
@@ -619,6 +622,9 @@ class urlretrieve_FileTests(unittest.TestCase):
     """Test urllib.urlretrieve() on local files"""
 
     def setUp(self):
+        # clear _opener global variable
+        self.addCleanup(urllib.request.urlcleanup)
+
         # Create a list of temporary files. Each item in the list is a file
         # name (absolute path or relative to the current working directory).
         # All files in this list will be deleted in the tearDown method. Note,
@@ -759,6 +765,8 @@ class urlretrieve_HttpTests(unittest.TestCase, FakeHTTPMixin):
     """Test urllib.urlretrieve() using fake http connections"""
 
     def test_short_content_raises_ContentTooShortError(self):
+        self.addCleanup(urllib.request.urlcleanup)
+
         self.fakehttp(b'''HTTP/1.1 200 OK
 Date: Wed, 02 Jan 2008 03:03:54 GMT
 Server: Apache/1.3.33 (Debian GNU/Linux) mod_ssl/2.8.22 OpenSSL/0.9.7e
@@ -780,6 +788,8 @@ FF
                 self.unfakehttp()
 
     def test_short_content_raises_ContentTooShortError_without_reporthook(self):
+        self.addCleanup(urllib.request.urlcleanup)
+
         self.fakehttp(b'''HTTP/1.1 200 OK
 Date: Wed, 02 Jan 2008 03:03:54 GMT
 Server: Apache/1.3.33 (Debian GNU/Linux) mod_ssl/2.8.22 OpenSSL/0.9.7e

Lib/test/test_urllib2.py

@@ -47,6 +47,9 @@ class TrivialTests(unittest.TestCase):
     def test_trivial(self):
         # A couple trivial tests
 
+        # clear _opener global variable
+        self.addCleanup(urllib.request.urlcleanup)
+
         self.assertRaises(ValueError, urllib.request.urlopen, 'bogus url')
 
         # XXX Name hacking to get this to work on Windows.
@@ -1290,6 +1293,10 @@ class HandlerTests(unittest.TestCase):
 
     def test_redirect_no_path(self):
         # Issue 14132: Relative redirect strips original path
+
+        # clear _opener global variable
+        self.addCleanup(urllib.request.urlcleanup)
+
         real_class = http.client.HTTPConnection
         response1 = b"HTTP/1.1 302 Found\r\nLocation: ?query\r\n\r\n"
         http.client.HTTPConnection = test_urllib.fakehttp(response1)

Lib/test/test_urllib2_localnet.py

@@ -447,6 +447,9 @@ class TestUrlopen(unittest.TestCase):
     def setUp(self):
         super(TestUrlopen, self).setUp()
 
+        # clear _opener global variable
+        self.addCleanup(urllib.request.urlcleanup)
+
         # Ignore proxies for localhost tests.
         def restore_environ(old_environ):
             os.environ.clear()

Lib/test/test_urllib2net.py

@@ -82,6 +82,9 @@ class AuthTests(unittest.TestCase):
 class CloseSocketTest(unittest.TestCase):
 
     def test_close(self):
+        # clear _opener global variable
+        self.addCleanup(urllib.request.urlcleanup)
+
         # calling .close() on urllib2's response objects should close the
         # underlying socket
         url = support.TEST_HTTP_URL
@@ -257,6 +260,10 @@ class OtherNetworkTests(unittest.TestCase):
 
 
 class TimeoutTest(unittest.TestCase):
+    def setUp(self):
+        # clear _opener global variable
+        self.addCleanup(urllib.request.urlcleanup)
+
     def test_http_basic(self):
         self.assertIsNone(socket.getdefaulttimeout())
         url = support.TEST_HTTP_URL

Lib/test/test_urllibnet.py

@@ -25,6 +25,9 @@ class URLTimeoutTest(unittest.TestCase):
         socket.setdefaulttimeout(None)
 
     def testURLread(self):
+        # clear _opener global variable
+        self.addCleanup(urllib.request.urlcleanup)
+
         domain = urllib.parse.urlparse(support.TEST_HTTP_URL).netloc
         with support.transient_internet(domain):
             f = urllib.request.urlopen(support.TEST_HTTP_URL)
@@ -48,6 +51,10 @@ class urlopenNetworkTests(unittest.TestCase):
 
     url = 'http://www.pythontest.net/'
 
+    def setUp(self):
+        # clear _opener global variable
+        self.addCleanup(urllib.request.urlcleanup)
+
     @contextlib.contextmanager
     def urlopen(self, *args, **kwargs):
         resource = args[0]
@@ -144,6 +151,10 @@ class urlopenNetworkTests(unittest.TestCase):
 class urlretrieveNetworkTests(unittest.TestCase):
     """Tests urllib.request.urlretrieve using the network."""
 
+    def setUp(self):
+        # remove temporary files created by urlretrieve()
+        self.addCleanup(urllib.request.urlcleanup)
+
     @contextlib.contextmanager
     def urlretrieve(self, *args, **kwargs):
         resource = args[0]

Misc/NEWS.d/next/Tests/2019-07-01-19-56-17.bpo-37421.bOe350.rst

+urllib.request tests now call :func:`~urllib.request.urlcleanup` to remove
+temporary files created by ``urlretrieve()`` tests and to clear the ``_opener``
+global variable set by ``urlopen()`` and functions calling indirectly
+``urlopen()``.