def test_range_with_step(self):
        start = self.min + 10
        stop = start + 10
        step = 2
        field = self.field('{0}-{1}/{2}'.format(start, stop, step))
        assert start in field
        assert stop in field
        assert (start + step) in field
        assert not (stop + step) in field
        assert not (start + (step - 1)) in field
        assert not (start + (step + 1)) in field
Testing F() expressions on GeometryFields.
dataset/ETHPy150Open ahawker/crython/tests/test_field.py/CronField.test_range_with_step--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/contrib/gis/tests/relatedapp/tests.py/RelatedGeoModelTest.test06_f_expressions