'Test aggregation: cumulate (no grouping)'

def testAggregateCumulate(self):

    period = self.period
    assertEqual = self.assertEqual
    totals = period.aggregate(S3TimeSeriesFact('cumulate', 'base', slope='slope', interval='days'))
    assertEqual(period.rows, {})
    assertEqual(period.cols, {})
    assertEqual(period.matrix, {})
    expected_totals = [2248]
    assertEqual(period.totals, expected_totals)
    assertEqual(totals, expected_totals)
