TNL-4895 User dropdown reflects real user

Exposes real_user to the user_dropdown template, allowing for the requested
feature change of keeping the profile links pointed at the real user's profile.

lms/djangoapps/courseware/tests/test_masquerade.py

@@ -149,6 +149,18 @@ class MasqueradeTestCase(SharedModuleStoreTestCase, LoginEnrollmentTestCase):
         self.assertIn(self.problem_display_name, problem_html)
         self.assertEqual(show_answer_expected, "Show Answer" in problem_html)
 
+    def verify_original_user_profile_link(self):
+        """
+        Verifies that the 'Profile' link in the navigation dropdown is pointing
+        to the original user.
+        """
+        content = self.get_courseware_page().content
+        self.assertIn(
+            '<a href="/u/{}" class="action dropdown-menuitem">Profile</a>'.format(self.test_user.username),
+            content,
+            "Profile link should point to original user",
+        )
+
 
 @attr(shard=1)
 class NormalStudentVisibilityTest(MasqueradeTestCase):
@@ -326,6 +338,9 @@ class TestStaffMasqueradeAsSpecificStudent(StaffMasqueradeTestCase, ProblemSubmi
         self.update_masquerade(role='student', user_name=self.student_user.username)
         self.assertEqual(self.get_progress_detail(), u'2/2')
 
+        # Verify that the user dropdown links have not changed
+        self.verify_original_user_profile_link()
+
         # Temporarily override the student state.
         self.submit_answer('Correct', 'Incorrect')
         self.assertEqual(self.get_progress_detail(), u'1/2')