Merge pull request #2672 from ikaven1024/ut-download

[ut] improve download from httptest

pkg/karmadactl/cmdinit/utils/util.go

@@ -21,11 +21,16 @@ type Downloader struct {
 // Read Implementation of Downloader
 func (d *Downloader) Read(p []byte) (n int, err error) {
 	n, err = d.Reader.Read(p)
+	if err != nil {
+		if err != io.EOF {
+			return
+		}
+		fmt.Println("\nDownload complete.")
+		return
+	}
+
 	d.Current += int64(n)
 	fmt.Printf("\rDownloading...[ %.2f%% ]", float64(d.Current*10000/d.Total)/100)
-	if d.Current == d.Total {
-		fmt.Printf("\nDownload complete.")
-	}
 	return
 }
 

pkg/karmadactl/cmdinit/utils/util_test.go

@@ -1,26 +1,81 @@
 package utils
 
 import (
+	"archive/tar"
+	"bytes"
+	"compress/gzip"
+	"io"
+	"net/http"
+	"net/http/httptest"
 	"os"
+	"path/filepath"
 	"testing"
 )
 
-const (
-	filePath = "./crds.tar.gz"
-	folder   = "./crds"
-)
-
 // TestDownloadFile test DownloadFile
 func TestDownloadFile(t *testing.T) {
-	defer os.Remove(filePath)
-	defer os.RemoveAll(folder)
+	const testFileName = "test.txt"
+	testFileContent := []byte("test")
 
-	url := "https://github.com/karmada-io/karmada/releases/download/v0.9.0/crds.tar.gz"
-	if err := DownloadFile(url, filePath); err != nil {
-		panic(err)
+	serverTar := func() io.Reader {
+		buf := bytes.NewBuffer(nil)
+		gw := gzip.NewWriter(buf)
+		defer func() {
+			if err := gw.Close(); err != nil {
+				t.Fatal(err)
+			}
+		}()
+		tw := tar.NewWriter(gw)
+		defer func() {
+			if err := tw.Close(); err != nil {
+				t.Fatal(err)
+			}
+		}()
+		hdr := &tar.Header{
+			Name: testFileName,
+			Mode: 0600,
+			Size: int64(len(testFileContent)),
+		}
+		if err := tw.WriteHeader(hdr); err != nil {
+			t.Fatal(err)
+		}
+		if _, err := tw.Write(testFileContent); err != nil {
+			t.Fatal(err)
+		}
+		return buf
+	}()
+
+	s := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+		if _, err := io.Copy(rw, serverTar); err != nil {
+			t.Fatal(err)
+		}
+	}))
+	defer s.Close()
+
+	tmpDir, err := os.MkdirTemp("", "karmada-test-download-")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() {
+		_ = os.RemoveAll(tmpDir)
+	}()
+
+	downloadTar := filepath.Join(tmpDir, "test.tar.gz")
+	err = DownloadFile(s.URL, downloadTar)
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = DeCompress(downloadTar, tmpDir)
+	if err != nil {
+		t.Fatal(err)
 	}
 
-	if err := DeCompress(filePath, "./"); err != nil {
-		panic(err)
+	got, err := os.ReadFile(filepath.Join(tmpDir, testFileName))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if want := testFileContent; !bytes.Equal(got, want) {
+		t.Errorf("DeCompress() got %v, want %v", got, want)
 	}
 }