Move engine-api client package

This moves the engine-api client package to `/docker/docker/client`.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

client/service_update_test.go

@@ -0,0 +1,77 @@
+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{
+		transport: newMockClient(nil, 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{
+			transport: newMockClient(nil, 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("body"))),
+				}, nil
+			}),
+		}
+
+		err := client.ServiceUpdate(context.Background(), "service_id", updateCase.swarmVersion, swarm.ServiceSpec{}, types.ServiceUpdateOptions{})
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+}