// content for the part to be uploaded.
	buffer1 := bytes.NewReader([]byte("hello world"))
	// HTTP request for the part to be uploaded.
	request, err = newTestSignedRequest(http.MethodPut, getPartUploadURL(s.endPoint, bucketName, objectName, uploadID, "1"),
		int64(buffer1.Len()), buffer1, s.accessKey, s.secretKey, s.signer)
	c.Assert(err, nil)
	// execute the HTTP request to upload the first part.