Simplify HelpContextProcessorTest a little

(cherry picked from commit acee7b55aff0c73c08552199c536d84555bcaae4)

common/djangoapps/util/tests/test_help_context_processor.py

@@ -21,9 +21,6 @@ class HelpContextProcessorTest(TestCase):
     Tests for help_context_processor.py
     """
 
-    def setUp(self):
-        super(HelpContextProcessorTest, self).setUp()
-
     @staticmethod
     def _get_doc_url(page_token=None):
         """ Helper method for getting the doc url. """
@@ -38,32 +35,32 @@ class HelpContextProcessorTest(TestCase):
         # Test default values.
         self.assertEqual(
             "http://edx.readthedocs.io/projects/open-edx-learner-guide/en/latest/index.html",
-            HelpContextProcessorTest._get_doc_url()
+            self._get_doc_url()
         )
 
         # Provide a known page_token.
         self.assertEqual(
             "http://edx.readthedocs.io/projects/open-edx-learner-guide/en/latest/sfd_dashboard_profile/index.html",
-            HelpContextProcessorTest._get_doc_url('profile')
+            self._get_doc_url('profile')
         )
 
         # Use settings.DOC_LINK_BASE_URL to override default base_url.
         with patch('django.conf.settings.DOC_LINK_BASE_URL', 'settings_base_url'):
             self.assertEqual(
                 "settings_base_url/en/latest/SFD_instructor_dash_help.html",
-                HelpContextProcessorTest._get_doc_url('instructor')
+                self._get_doc_url('instructor')
             )
 
     def test_get_pdf_url(self):
         # Test default values.
         self.assertEqual(
             "https://media.readthedocs.org/pdf/open-edx-learner-guide/latest/open-edx-learner-guide.pdf",
-            HelpContextProcessorTest._get_pdf_url()
+            self._get_pdf_url()
         )
 
         # Use settings.DOC_LINK_BASE_URL to override default base_url.
         with patch('django.conf.settings.DOC_LINK_BASE_URL', 'settings_base_url'):
             self.assertEqual(
                 "settings_base_url/latest/open-edx-learner-guide.pdf",
-                HelpContextProcessorTest._get_pdf_url()
+                self._get_pdf_url()
             )