test: test_capa_system helper function replaced by mock_capa_system

xmodule/capa/tests/test_util.py

@@ -9,7 +9,7 @@ import unittest
 import ddt
 from lxml import etree
 
-from xmodule.capa.tests.helpers import test_capa_system
+from xmodule.capa.tests.helpers import mock_capa_system
 from xmodule.capa.util import (
     compare_with_tolerance,
     contextualize_text,
@@ -25,7 +25,7 @@ class UtilTest(unittest.TestCase):
 
     def setUp(self):
         super(UtilTest, self).setUp()  # lint-amnesty, pylint: disable=super-with-arguments
-        self.system = test_capa_system()
+        self.system = mock_capa_system()
 
     def test_compare_with_tolerance(self):  # lint-amnesty, pylint: disable=too-many-statements
         # Test default tolerance '0.001%' (it is relative)