add another unit test to explicitly exercise the can_execute_unsafe_code() method

common/djangoapps/util/tests/test_sandboxing.py

+"""
+Tests for sandboxing.py in util app
+"""
+
+from django.test import TestCase
+from util.sandboxing import can_execute_unsafe_code
+from django.test.utils import override_settings
+
+
+class SandboxingTest(TestCase):
+    """
+    Test sandbox whitelisting
+    """
+    @override_settings(COURSES_WITH_UNSAFE_CODE=['edX/full/.*'])
+    def test_sandbox_exclusion(self):
+        """
+        Test to make sure that a non-match returns false
+        """
+        self.assertFalse(can_execute_unsafe_code('edX/notful/empty'))
+
+    @override_settings(COURSES_WITH_UNSAFE_CODE=['edX/full/.*'])
+    def test_sandbox_inclusion(self):
+        """
+        Test to make sure that a match works across course runs
+        """
+        self.assertTrue(can_execute_unsafe_code('edX/full/2012_Fall'))
+        self.assertTrue(can_execute_unsafe_code('edX/full/2013_Spring'))
+