def test_otherLocals(self):
        result = self.evaluateExpression(
            "isinstance(datetime.utcnow() - datetime.utcnow(), timedelta)", {})
        self.assertEqual(result, True)
The expression has access to L{datetime} and L{timedelta} in its
dataset/ETHPy150Open ClusterHQ/eliot/eliot/tests/test_filter.py/EliotFilterTests.test_otherLocals