Add unit tests for ImageTag

Signed-off-by: Vincent Demeester <vincent@sbr.pm>

client/image_tag_test.go

@@ -0,0 +1,86 @@
+package client
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"strings"
+	"testing"
+
+	"github.com/docker/engine-api/client/transport"
+	"github.com/docker/engine-api/types"
+)
+
+func TestImageTagError(t *testing.T) {
+	client := &Client{
+		transport: transport.NewMockClient(nil, transport.ErrorMock(http.StatusInternalServerError, "Server error")),
+	}
+
+	err := client.ImageTag(types.ImageTagOptions{})
+	if err == nil || err.Error() != "Error response from daemon: Server error" {
+		t.Fatalf("expected a Server Error, got %v", err)
+	}
+}
+
+func TestImageTag(t *testing.T) {
+	expectedURL := "/images/image_id/tag"
+	tagCases := []struct {
+		force               bool
+		repositoryName      string
+		tag                 string
+		expectedQueryParams map[string]string
+	}{
+		{
+			force:          false,
+			repositoryName: "repository",
+			tag:            "tag1",
+			expectedQueryParams: map[string]string{
+				"force": "",
+				"repo":  "repository",
+				"tag":   "tag1",
+			},
+		}, {
+			force:          true,
+			repositoryName: "another_repository",
+			tag:            "latest",
+			expectedQueryParams: map[string]string{
+				"force": "1",
+				"repo":  "another_repository",
+				"tag":   "latest",
+			},
+		},
+	}
+	for _, tagCase := range tagCases {
+		client := &Client{
+			transport: 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)
+				}
+				query := req.URL.Query()
+				for key, expected := range tagCase.expectedQueryParams {
+					actual := query.Get(key)
+					if actual != expected {
+						return nil, fmt.Errorf("%s not set in URL query properly. Expected '%s', got %s", key, expected, actual)
+					}
+				}
+				return &http.Response{
+					StatusCode: http.StatusOK,
+					Body:       ioutil.NopCloser(bytes.NewReader([]byte(""))),
+				}, nil
+			}),
+		}
+		err := client.ImageTag(types.ImageTagOptions{
+			ImageID:        "image_id",
+			Force:          tagCase.force,
+			RepositoryName: tagCase.repositoryName,
+			Tag:            tagCase.tag,
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+}