test: Add test case to ResourceLoader import in openassessmentblock

openassessment/xblock/test/test_openassessment.py

@@ -5,6 +5,7 @@
 import datetime as dt
 from io import StringIO
 import json
+import unittest
 from unittest import mock
 from unittest.mock import MagicMock, Mock, PropertyMock, patch
 from django.test.utils import override_settings
@@ -1422,3 +1423,21 @@ def test_ora_indexibility_with_multiple_html_prompt(self, xblock):
         self.assertEqual(content["display_name"], "Open Response Assessment")
         self.assertEqual(content["prompt_0"], "What is computer? It is a machine")
         self.assertEqual(content["prompt_1"], "Is it a calculator? Or is it a microwave")
+
+
+
+class TestResourceLoaderImport(unittest.TestCase):
+    @patch('xblock.utils.resources')
+    def test_import_falls_back(self, mock_resources):
+        # Simulate a ModuleNotFoundError for the first import
+        mock_resources.ResourceLoader.side_effect = ModuleNotFoundError
+
+        # Now try to import and check if the fallback works
+        try:
+            from openassessmentblock import ResourceLoader
+        except ImportError:
+            self.fail("Import should not raise ImportError")
+
+        # Check if ResourceLoader is the one from xblockutils.resources
+        from xblockutils.resources import ResourceLoader as FallbackLoader
+        self.assertIs(ResourceLoader, FallbackLoader)