test(crawler): add unit tests for periodic task scheduling

backend/crawler/tests.py

@@ -184,3 +184,14 @@ class CrawlTaskCeleryTests(APITestCase):
         self.run.refresh_from_db()
         self.assertEqual(self.run.status, 'FAILED')
         self.assertEqual(self.run.error_log, "CrawlTask is inactive.")
+
+    @patch('crawler.tasks.run_crawl_pipeline.delay')
+    def test_check_and_schedule_crawl_tasks(self, mock_delay):
+        from crawler.tasks import check_and_schedule_crawl_tasks
+        CrawlRun.objects.all().delete()
+
+        check_and_schedule_crawl_tasks()
+
+        self.assertEqual(CrawlRun.objects.count(), 1)
+        mock_delay.assert_called_once()
+