response, err := s.client.Do(request)
	c.Assert(err, nil)

	// assert the http response status code.
	c.Assert(response.StatusCode, http.StatusOK)

	request, err = newTestSignedRequest(http.MethodPut, getPutNotificationURL(s.endPoint, bucketName),
		int64(len(bucketNotificationBuf)), bytes.NewReader([]byte(bucketNotificationBuf)), s.accessKey, s.secretKey, s.signer)
	c.Assert(err, nil)

	// execute the HTTP request.

func getCopyObjectURL(endPoint, bucketName, objectName string) string {
	return makeTestTargetURL(endPoint, bucketName, objectName, url.Values{})
}

// return URL for inserting bucket notification.
func getPutNotificationURL(endPoint, bucketName string) string {
	queryValue := url.Values{}
	queryValue.Set("notification", "")
	return makeTestTargetURL(endPoint, bucketName, "", queryValue)
}