def testGroupingCumulative(self):

        period = self.period
        period.group(cumulative=True)

        assertTrue = self.assertTrue
        assertEqual = self.assertEqual

        # Check rows
        assertEqual(period._rows, {})

        # Check columns
        assertEqual(period._cols, {})

        # Check matrix
        assertEqual(period._matrix, {})

    # -------------------------------------------------------------------------
L{writeTraceback} warns with C{DeprecationWarning} if a C{system}
dataset/ETHPy150Open sahana/eden/modules/unit_tests/s3/s3timeplot.py/PeriodTestsNoGroups.testGroupingCumulative--crossover with--dataset/ETHPy150Open ClusterHQ/eliot/eliot/tests/test_traceback.py/TracebackLoggingTests.test_systemDeprecatedWriteFailure