test: add container rename client side mock test

client/container.go

@@ -135,17 +135,6 @@ func (client *APIClient) ContainerGet(ctx context.Context, name string) (*types.
 	return &container, err
 }
 
-// ContainerRename renames a container.
-func (client *APIClient) ContainerRename(ctx context.Context, id string, name string) error {
-	q := url.Values{}
-	q.Add("name", name)
-
-	resp, err := client.post(ctx, "/containers/"+id+"/rename", q, nil, nil)
-	ensureCloseReader(resp)
-
-	return err
-}
-
 // ContainerRestart restarts a running container.
 func (client *APIClient) ContainerRestart(ctx context.Context, name string, timeout string) error {
 	q := url.Values{}

client/container_rename.go

@@ -0,0 +1,17 @@
+package client
+
+import (
+	"context"
+	"net/url"
+)
+
+// ContainerRename renames a container.
+func (client *APIClient) ContainerRename(ctx context.Context, id string, name string) error {
+	q := url.Values{}
+	q.Add("name", name)
+
+	resp, err := client.post(ctx, "/containers/"+id+"/rename", q, nil, nil)
+	ensureCloseReader(resp)
+
+	return err
+}

client/container_rename_test.go

@@ -0,0 +1,50 @@
+package client
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"strings"
+	"testing"
+)
+
+func TestContainerRenameError(t *testing.T) {
+	client := &APIClient{
+		HTTPCli: newMockClient(errorMockResponse(http.StatusInternalServerError, "Server error")),
+	}
+	err := client.ContainerRename(context.Background(), "nothing", "containerRename")
+	if err == nil || !strings.Contains(err.Error(), "Server error") {
+		t.Fatalf("expected a Server Error, got %v", err)
+	}
+}
+
+func TestContainerRename(t *testing.T) {
+	expectedURL := "/containers/container_id/rename"
+
+	httpClient := 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.Header.Get("Content-Type") == "application/json" {
+			var renameConfig interface{}
+			if err := json.NewDecoder(req.Body).Decode(&renameConfig); err != nil {
+				return nil, fmt.Errorf("failed to parse json: %v", err)
+			}
+		}
+		return &http.Response{
+			StatusCode: http.StatusOK,
+			Body:       ioutil.NopCloser(bytes.NewReader([]byte(""))),
+		}, nil
+	})
+
+	client := &APIClient{
+		HTTPCli: httpClient,
+	}
+
+	if err := client.ContainerRename(context.Background(), "container_id", "containerRename"); err != nil {
+		t.Fatal(err)
+	}
+}