def METHOD_NAME(self):
    # add mutable objects to data, check that the value *at that time* is saved
    exp = data.ExperimentHandler(
        name='testExp',
        savePickle=False,
        saveWideText=True,
        dataFileName=self.tmpDir + 'mutables'
        )
    mutant = [1]
    exp.addData('mutable', mutant)
    exp.nextEntry()
    mutant[0] = 9999
    exp.addData('mutable', mutant)
    exp.nextEntry()
    exp.saveAsWideText(exp.dataFileName+'.csv', delim=',')
    # get data file contents:
    with io.open(exp.dataFileName + '.csv', 'r', encoding='utf-8-sig') as f:
        contents = f.read()
    assert contents == "thisRow.t,notes,mutable,\n,,[1],\n,,[9999],\n"