Add cosmetic price field to studio & logic

- Price field added to Advanced Settings
- Function that decides which price to display
- Test added to check that the function outputs correct price
- Added feature flag and conditional to decide whether to display course price or not
- Feature Flag to show or hide course price on Course About page sidebar when not using shopping cart

lms/djangoapps/courseware/tests/test_views.py

@@ -199,6 +199,24 @@ class ViewsTestCase(TestCase):
         mock_course.id = self.course_key
         self.assertTrue(views.registered_for_course(mock_course, self.user))
 
+    @override_settings(PAID_COURSE_REGISTRATION_CURRENCY=["USD", "$"])
+    def test_get_cosmetic_display_price(self):
+        """
+        Check that get_cosmetic_display_price() returns the correct price given its inputs.
+        """
+        registration_price = 99
+        self.course.cosmetic_display_price = 10
+        # Since registration_price is set, it overrides the cosmetic_display_price and should be returned
+        self.assertEqual(views.get_cosmetic_display_price(self.course, registration_price), "$99")
+
+        registration_price = 0
+        # Since registration_price is not set, cosmetic_display_price should be returned
+        self.assertEqual(views.get_cosmetic_display_price(self.course, registration_price), "$10")
+
+        self.course.cosmetic_display_price = 0
+        # Since both prices are not set, there is no price, thus "Free"
+        self.assertEqual(views.get_cosmetic_display_price(self.course, registration_price), "Free")
+
     def test_jump_to_invalid(self):
         # TODO add a test for invalid location
         # TODO add a test for no data *

lms/djangoapps/courseware/views.py

@@ -739,6 +739,25 @@ def registered_for_course(course, user):
         return False
 
 
+def get_cosmetic_display_price(course, registration_price):
+    """
+    Return Course Price as a string preceded by correct currency, or 'Free'
+    """
+    currency_symbol = settings.PAID_COURSE_REGISTRATION_CURRENCY[1]
+
+    price = course.cosmetic_display_price
+    if registration_price > 0:
+        price = registration_price
+
+    if price:
+        # Translators: This will look like '$50', where {currency_symbol} is a symbol such as '$' and {price} is a
+        # numerical amount in that currency. Adjust this display as needed for your language.
+        return _("{currency_symbol}{price}").format(currency_symbol=currency_symbol, price=price)
+    else:
+        # Translators: This refers to the cost of the course. In this case, the course costs nothing so it is free.
+        return _('Free')
+
+
 @ensure_csrf_cookie
 @cache_if_anonymous()
 def course_about(request, course_id):
@@ -795,6 +814,8 @@ def course_about(request, course_id):
             reg_then_add_to_cart_link = "{reg_url}?course_id={course_id}&enrollment_action=add_to_cart".format(
                 reg_url=reverse('register_user'), course_id=course.id.to_deprecated_string())
 
+        course_price = get_cosmetic_display_price(course, registration_price)
+
         # Used to provide context to message to student if enrollment not allowed
         can_enroll = has_access(request.user, 'enroll', course)
         invitation_only = course.invitation_only
@@ -817,8 +838,8 @@ def course_about(request, course_id):
             'studio_url': studio_url,
             'registered': registered,
             'course_target': course_target,
-            'registration_price': registration_price,
-            'currency_symbol': settings.PAID_COURSE_REGISTRATION_CURRENCY[1],
+            'is_cosmetic_price_enabled': settings.FEATURES.get('ENABLE_COSMETIC_DISPLAY_PRICE'),
+            'course_price': course_price,
             'in_cart': in_cart,
             'reg_then_add_to_cart_link': reg_then_add_to_cart_link,
             'show_courseware_link': show_courseware_link,