Issue #25365: test_pickle now works in threads disabled builds.

Lib/test/test_pickle.py

@@ -380,8 +380,9 @@ class CompatPickleTests(unittest.TestCase):
                     self.assertEqual(mapping('exceptions', name),
                                      ('builtins', name))
 
-        import multiprocessing.context
-        for name, exc in get_exceptions(multiprocessing.context):
+    def test_multiprocessing_exceptions(self):
+        module = support.import_module('multiprocessing.context')
+        for name, exc in get_exceptions(module):
             with self.subTest(name):
                 self.assertEqual(reverse_mapping('multiprocessing.context', name),
                                  ('multiprocessing', name))