package client
 
 import (
 	"bytes"
 	"fmt"
 	"io/ioutil"
 	"net/http"
 	"strings"
 	"testing"
 
 	"golang.org/x/net/context"
 
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/api/types/swarm"
 )
 
 func TestServiceUpdateError(t *testing.T) {
 	client := &Client{

 		client: newMockClient(errorMock(http.StatusInternalServerError, "Server error")),

 	}
 

 	_, err := client.ServiceUpdate(context.Background(), "service_id", swarm.Version{}, swarm.ServiceSpec{}, types.ServiceUpdateOptions{})

 	if err == nil || err.Error() != "Error response from daemon: Server error" {
 		t.Fatalf("expected a Server Error, got %v", err)
 	}
 }
 
 func TestServiceUpdate(t *testing.T) {
 	expectedURL := "/services/service_id/update"
 
 	updateCases := []struct {
 		swarmVersion    swarm.Version
 		expectedVersion string
 	}{
 		{
 			expectedVersion: "0",
 		},
 		{
 			swarmVersion: swarm.Version{
 				Index: 0,
 			},
 			expectedVersion: "0",
 		},
 		{
 			swarmVersion: swarm.Version{
 				Index: 10,
 			},
 			expectedVersion: "10",
 		},
 	}
 
 	for _, updateCase := range updateCases {
 		client := &Client{

 			client: newMockClient(func(req *http.Request) (*http.Response, error) {

 				if !strings.HasPrefix(req.URL.Path, expectedURL) {
 					return nil, fmt.Errorf("Expected URL '%s', got '%s'", expectedURL, req.URL)
 				}
 				if req.Method != "POST" {
 					return nil, fmt.Errorf("expected POST method, got %s", req.Method)
 				}
 				version := req.URL.Query().Get("version")
 				if version != updateCase.expectedVersion {
 					return nil, fmt.Errorf("version not set in URL query properly, expected '%s', got %s", updateCase.expectedVersion, version)
 				}
 				return &http.Response{
 					StatusCode: http.StatusOK,

 					Body:       ioutil.NopCloser(bytes.NewReader([]byte("{}"))),

 				}, nil
 			}),
 		}
 

 		_, err := client.ServiceUpdate(context.Background(), "service_id", updateCase.swarmVersion, swarm.ServiceSpec{}, types.ServiceUpdateOptions{})

 		if err != nil {
 			t.Fatal(err)
 		}
 	}
 }