def testPublishMetricDataWithDuplicateKeys(self, connectDynamoDB,
                                             _gracefulCreateTable):
    """ Test for elimination of rows with duplicate keys by _publishMetricData
    """
    metricId = "3b035a5916994f2bb950f5717138f94b"

    rowTemplate = dict(
      rowid=99,
      ts=epochFromNaiveUTCDatetime(datetime(2015, 3, 20, 0, 46, 28)),
      value=10305.0,
      rawAnomaly=0.275,
      anomaly=0.999840891
    )

    row1 = dict(rowTemplate)
    row2 = dict(rowTemplate)
    row2["rowid"] = row1["rowid"] + 1
    rows = [row1, row2]

    service = DynamoDBService()

    service._publishMetricData(metricId, rows)

    data = dynamodb_service.convertInferenceResultRowToMetricDataItem(metricId,
                                                                      row1)
    mockPutItem = (service._metric_data.batch_write.return_value.__enter__
                   .return_value.put_item)
    mockPutItem.assert_called_once_with(data=data._asdict(), overwrite=True)