Fix test errors in the import_courserun command tests (#3095)

Author: jkachel

courses/api_test.py

@@ -2066,7 +2066,13 @@ def _run_test_import_courserun_from_edx(  # noqa: PLR0913
         use_specific_course = CourseFactory.create().readable_id
 
     responses.get(
-        f"{settings.OPENEDX_API_BASE_URL}/api/courses/v1/courses/{test_course_run_key}/",
+        url=f"{settings.OPENEDX_API_BASE_URL}/api/courses/v1/courses/{test_course_run_key}/",
+        json=mocked_detail,
+        status=status.HTTP_200_OK,
+    )
+    # sometimes in CI this gets run without the trailing slash
+    responses.get(
+        url=f"{settings.OPENEDX_API_BASE_URL}/api/courses/v1/courses/{test_course_run_key}",
         json=mocked_detail,
         status=status.HTTP_200_OK,
     )