if err != nil {
		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
		return
	}

	objectRSC := s3select.NewObjectReadSeekCloser(
		func(offset int64) (io.ReadCloser, error) {
			rs := &HTTPRangeSpec{
				IsSuffixLength: false,
				Start:          offset,
				End:            -1,
			}
			opts.NoLock = true
			return getObjectNInfo(ctx, bucket, object, rs, r.Header, opts)
		},
		actualSize,
	)

	// `ExecObjectLayerAPINilTest` manages the operation.
	ExecObjectLayerAPINilTest(t, nilBucket, nilObject, instanceType, apiRouter, nilReq)
}

// Tests sanity of attempting to copying each parts at offsets from an existing
// file and create a new object. Also validates if the written is same as what we
// expected.
func TestAPICopyObjectPartHandlerSanity(t *testing.T) {
	defer DetectTestLeak(t)()

		ServerSideEncryption: opts.ServerSideEncryption,
		Internal: minio.AdvancedGetOptions{
			ReplicationProxyRequest: "true",
		},
		PartNumber: opts.PartNumber,
	}
	// get correct offsets for encrypted object
	if rs != nil {
		h, err := rs.ToHeader()
		if err != nil {
			return nil, proxy, err
		}
		gopts.Set(xhttp.Range, h)
	}
	// Make sure to match ETag when proxying.