@@ -2,6 +2,7 @@ package client

 import (

 	"encoding/json"

+	"errors"

 	"fmt"

 	"net/http"

 	"testing"

@@ -149,7 +150,7 @@ func TestExecStartConsoleSize(t *testing.T) {

 			client, err := New(

 				WithMockClient(func(req *http.Request) (*http.Response, error) {

 					if tc.expErr != "" {

-						return nil, fmt.Errorf("should not have made API request")

+						return nil, errors.New("should not have made API request")

 					}

 					if err := json.NewDecoder(req.Body).Decode(&actualReq); err != nil {

 						return nil, err