[test] Fixes for old Pythons

test/helper.py

@@ -9,6 +9,7 @@ import re
 import types
 import ssl
 import sys
+import unittest
 
 import youtube_dl.extractor
 from youtube_dl import YoutubeDL
@@ -17,6 +18,7 @@ from youtube_dl.compat import (
     compat_str,
 )
 from youtube_dl.utils import (
+    IDENTITY,
     preferredencoding,
     write_string,
 )
@@ -298,3 +300,7 @@ def http_server_port(httpd):
     else:
         sock = httpd.socket
     return sock.getsockname()[1]
+
+
+def expectedFailureIf(cond):
+    return unittest.expectedFailure if cond else IDENTITY

test/test_http.py

@@ -8,6 +8,7 @@ import sys
 import unittest
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
+import contextlib
 import gzip
 import io
 import ssl
@@ -154,7 +155,7 @@ class HTTPTestRequestHandler(compat_http_server.BaseHTTPRequestHandler):
 
         def gzip_compress(p):
             buf = io.BytesIO()
-            with gzip.GzipFile(fileobj=buf, mode='wb') as f:
+            with contextlib.closing(gzip.GzipFile(fileobj=buf, mode='wb')) as f:
                 f.write(p)
             return buf.getvalue()
 
@@ -306,6 +307,10 @@ class TestHTTP(unittest.TestCase):
             else self.https_port if scheme == 'https'
             else self.http_port, path)
 
+    @unittest.skipUnless(
+        sys.version_info >= (3, 2)
+        or (sys.version_info[0] == 2 and sys.version_info[1:] >= (7, 9)),
+        'No support for certificate check in SSL')
     def test_nocheckcertificate(self):
         with FakeYDL({'logger': FakeLogger()}) as ydl:
             with self.assertRaises(compat_urllib_error.URLError):

test/test_utils.py

@@ -1617,7 +1617,7 @@ Line 1
         self.assertEqual(traverse_obj(_TEST_DATA, lambda x, y: x == 'urls' and isinstance(y, list)),
                          [_TEST_DATA['urls']],
                          msg='function as query key should perform a filter based on (key, value)')
-        self.assertCountEqual(traverse_obj(_TEST_DATA, lambda _, x: isinstance(x[0], str)), {'str'},
+        self.assertCountEqual(traverse_obj(_TEST_DATA, lambda _, x: isinstance(x[0], str)), set(('str',)),
                               msg='exceptions in the query function should be catched')
         self.assertEqual(traverse_obj(iter(range(4)), lambda _, x: x % 2 == 0), [0, 2],
                          msg='function key should accept iterables')
@@ -1643,7 +1643,7 @@ Line 1
             with self.assertRaises(Exception, msg='Sets with length != 1 should raise in debug'):
                 traverse_obj(_TEST_DATA, set())
             with self.assertRaises(Exception, msg='Sets with length != 1 should raise in debug'):
-                traverse_obj(_TEST_DATA, {str.upper, str})
+                traverse_obj(_TEST_DATA, set((str.upper, str)))
 
         # Test `slice` as a key
         _SLICE_DATA = [0, 1, 2, 3, 4]
@@ -1779,7 +1779,7 @@ Line 1
                          {0: 100}, msg='type as expected_type should filter dict values')
         self.assertEqual(traverse_obj(_TEST_DATA, {0: 100, 1: 1.2, 2: 'None'}, expected_type=str_or_none),
                          {0: '100', 1: '1.2'}, msg='function as expected_type should transform dict values')
-        self.assertEqual(traverse_obj(_TEST_DATA, ({0: 1.2}, 0, {int_or_none}), expected_type=int),
+        self.assertEqual(traverse_obj(_TEST_DATA, ({0: 1.2}, 0, set((int_or_none,))), expected_type=int),
                          1, msg='expected_type should not filter non final dict values')
         self.assertEqual(traverse_obj(_TEST_DATA, {0: {0: 100, 1: 'str'}}, expected_type=int),
                          {0: {0: 100}}, msg='expected_type should transform deep dict values')