test: add migration test to verify skipping of excluded course ids

Author: BryanttV

openedx_authz/tests/test_migrations.py

@@ -1249,6 +1249,35 @@ def test_migrate_authz_to_legacy_course_roles_user_not_added(self):
         self.assertEqual(len(errors), 12)
         self.assertEqual(len(successes), 0)
 
+    @patch("openedx_authz.api.data.CourseOverview", CourseOverview)
+    def test_migrate_authz_to_legacy_course_roles_skips_excluded_course_ids(self):
+        """Course-level assignments whose scope is listed in excluded_course_ids are skipped."""
+        migrate_legacy_course_roles_to_authz(
+            CourseAccessRole,
+            course_id_list=[self.course_id],
+            org_id=None,
+            delete_after_migration=False,
+        )
+
+        errors, successes = migrate_authz_to_legacy_course_roles(
+            CourseAccessRole,
+            UserSubject,
+            course_id_list=[self.course_id],
+            org_id=None,
+            delete_after_migration=False,
+            excluded_course_ids=frozenset({self.course_id}),
+        )
+
+        self.assertEqual(len(successes), 0)
+        self.assertEqual(len(errors), 12)
+        for entry in errors:
+            self.assertEqual(entry.reason, MigrationErrorReason.SKIPPED_FOR_FLAG_OVERRIDE)
+            self.assertEqual(
+                entry.details,
+                "Course-level authoring flag override opposes this organization-level transition",
+            )
+            self.assertEqual(entry.scope, self.course_id)
+
     def create_library_env(self):
         """
         Helper method to create a ContentLibrary environment for testing.