Update file test_xapi_statement_validation.py

src/xapi/tests/test_xapi_statement_validation.py

@@ -2,6 +2,7 @@ import json
 import os
 
 from django.test import TestCase
+from jsonschema.validators import validator_for
 from jsonschema import ValidationError, validate
 
 PROJECT_PATH = os.path.abspath(os.path.dirname(__name__))