Writes data from streams into CSV in working directory.
    :return:

def populateCsv(self):
    """
    Writes data from streams into CSV in working directory.
    :return:
    """
    workingDirPath = createDir(self._workingDir)
    csvPath = os.path.join(workingDirPath, "data.csv")
    self.writeCsv(csvPath)
    return csvPath, workingDirPath