package client // import "github.com/docker/docker/client"

 
 import (
 	"bytes"

 	"context"

 	"encoding/json"
 	"fmt"
 	"io/ioutil"
 	"net/http"
 	"strings"
 	"testing"
 
 	"github.com/docker/docker/api/types"

 	"github.com/docker/docker/errdefs"

 )
 
 func TestDiskUsageError(t *testing.T) {
 	client := &Client{
 		client: newMockClient(errorMock(http.StatusInternalServerError, "Server error")),
 	}
 	_, err := client.DiskUsage(context.Background())
 	if err == nil || err.Error() != "Error response from daemon: Server error" {
 		t.Fatalf("expected a Server Error, got %v", err)
 	}

 	if !errdefs.IsSystem(err) {
 		t.Fatalf("expected a Server Error, got %T", err)
 	}

 }
 
 func TestDiskUsage(t *testing.T) {
 	expectedURL := "/system/df"
 	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)
 			}
 
 			du := types.DiskUsage{
 				LayersSize: int64(100),
 				Images:     nil,
 				Containers: nil,
 				Volumes:    nil,
 			}
 
 			b, err := json.Marshal(du)
 			if err != nil {
 				return nil, err
 			}
 
 			return &http.Response{
 				StatusCode: http.StatusOK,
 				Body:       ioutil.NopCloser(bytes.NewReader(b)),
 			}, nil
 		}),
 	}
 	if _, err := client.DiskUsage(context.Background()); err != nil {
 		t.Fatal(err)
 	}
 }