fix: Stop showing course certificate buttons to beta testers (#28416)

Beta testers can’t earn course certificates, so they should not see a “Request Certificate” button or other info describing how they can earn a cert.

MICROBA-992

lms/djangoapps/instructor/access.py

@@ -112,3 +112,11 @@ def update_forum_role(course_id, user, rolename, action):
         role.users.remove(user)
     else:
         raise ValueError(f"unrecognized action '{action}'")
+
+
+def is_beta_tester(user, course_id):
+    """
+    Returns True if the user is a beta tester in this course, and False if not
+    """
+    beta_testers_queryset = list_with_level(course_id, 'beta')
+    return beta_testers_queryset.filter(username=user.username).exists()

lms/djangoapps/instructor/tests/test_access.py

@@ -10,6 +10,7 @@ from common.djangoapps.student.tests.factories import UserFactory
 from lms.djangoapps.instructor.access import (
     allow_access,
     list_with_level,
+    is_beta_tester,
     revoke_access,
     update_forum_role
 )
@@ -47,6 +48,12 @@ class TestInstructorAccessList(SharedModuleStoreTestCase):
         assert set(beta_testers) == set(self.beta_testers)
         assert set(beta_testers_alternative) == set(self.beta_testers)
 
+    def test_is_beta(self):
+        beta_tester = self.beta_testers[0]
+        user = UserFactory.create()
+        assert is_beta_tester(beta_tester, self.course.id)
+        assert not is_beta_tester(user, self.course.id)
+
 
 class TestInstructorAccessAllow(EmailTemplateTagMixin, SharedModuleStoreTestCase):
     """ Test access allow. """