multipartResponse := &InitiateMultipartUploadResponse{}
		err = decoder.Decode(multipartResponse)
		if err != nil {
			t.Fatalf("Error decoding the recorded response Body")
		}
		upID := multipartResponse.UploadID

		// Upload each part
		var cp []CompletePart
		cumulativeSum := int64(0)
		for i, partLen := range partSizes {
			partID := i + 1