test: Switch the contentstore tests to use APIs

Since we're trying to drop the underlying page, switch to the equivalent
API views for these contentstore tests.

cms/djangoapps/contentstore/tests/test_contentstore.py

@@ -16,11 +16,11 @@ from unittest import SkipTest, mock
 from uuid import uuid4
 
 import ddt
-import lxml.html
 from django.conf import settings
 from django.contrib.auth.models import User  # lint-amnesty, pylint: disable=imported-auth-user
 from django.test import TestCase
 from django.test.utils import override_settings
+from django.urls import reverse
 from edx_toggles.toggles.testutils import override_waffle_switch, override_waffle_flag
 from edxval.api import create_video, get_videos_for_course
 from fs.osfs import OSFS
@@ -1388,17 +1388,6 @@ class ContentStoreTest(ContentStoreTestCase):
         resp = self.client.ajax_post('/course/', self.course_data)
         self.assertEqual(resp.status_code, 403)
 
-    @override_waffle_flag(toggles.LEGACY_STUDIO_HOME, True)
-    def test_course_index_view_with_no_courses(self):
-        """Test viewing the index page with no courses"""
-        resp = self.client.get_html('/home/')
-        self.assertContains(
-            resp,
-            f'<h1 class="page-header">{settings.STUDIO_SHORT_NAME} Home</h1>',
-            status_code=200,
-            html=True
-        )
-
     def test_course_factory(self):
         """Test that the course factory works correctly."""
         course = CourseFactory.create()
@@ -1879,17 +1868,21 @@ class RerunCourseTest(ContentStoreTestCase):
         """
         Asserts that the given course key is NOT in the unsucceeded course action section of the html.
         """
-        with override_waffle_flag(toggles.LEGACY_STUDIO_HOME, True):
-            course_listing = lxml.html.fromstring(self.client.get_html('/home/').content)
-        self.assertEqual(len(self.get_unsucceeded_course_action_elements(course_listing, course_key)), 0)
+        response = self.client.get(reverse('cms.djangoapps.contentstore:v2:courses'))
+        assert str(course_key) not in [
+            course["course_key"]
+            for course in response.json()["results"]["in_process_course_actions"]
+        ]
 
     def assertInUnsucceededCourseActions(self, course_key):
         """
         Asserts that the given course key is in the unsucceeded course action section of the html.
         """
-        with override_waffle_flag(toggles.LEGACY_STUDIO_HOME, True):
-            course_listing = lxml.html.fromstring(self.client.get_html('/home/').content)
-        self.assertEqual(len(self.get_unsucceeded_course_action_elements(course_listing, course_key)), 1)
+        response = self.client.get(reverse('cms.djangoapps.contentstore:v2:courses'))
+        assert str(course_key) in [
+            course["course_key"]
+            for course in response.json()["results"]["in_process_course_actions"]
+        ]
 
     def verify_rerun_course(self, source_course_key, destination_course_key, destination_display_name):
         """