@@ -9,7 +9,6 @@ import (

 	"net/http"

 	"net/http/httptest"

 	"net/url"

-	"os"

 	"strings"

 	"testing"

 	"time"

@@ -169,15 +168,21 @@ func TestNewClientWithTimeout(t *testing.T) {

 	m := Manifest{[]string{"VolumeDriver", "NetworkDriver"}}

 	mux.HandleFunc("/Test.Echo", func(w http.ResponseWriter, r *http.Request) {

-		time.Sleep(20 * time.Millisecond)

+		time.Sleep(50 * time.Millisecond)

 		io.Copy(w, r.Body)

 	})

 	timeout := 10 * time.Millisecond

 	c, _ := NewClientWithTimeout(addr, &tlsconfig.Options{InsecureSkipVerify: true}, timeout)

 	var output Manifest

+

 	err := c.CallWithOptions("Test.Echo", m, &output, func(opts *RequestOpts) { opts.testTimeOut = 1 })

-	assert.ErrorType(t, err, os.IsTimeout)

+	var tErr interface {

+		Timeout() bool

+	}

+	if assert.Check(t, errors.As(err, &tErr), "want timeout error, got %T", err) {

+		assert.Check(t, tErr.Timeout())

+	}

 }

 func TestClientStream(t *testing.T) {