Add unit test for pkg/archive

changelogs/unreleased/6396-allenxu404

@@ -0,0 +1 @@
+Add unit tests for pkg/archive

pkg/archive/extractor.go

@@ -1,5 +1,5 @@
 /*
-Copyright 2019 the Velero contributors.
+Copyright the Velero contributors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.

pkg/archive/extractor_test.go

@@ -0,0 +1,151 @@
+/*
+Copyright The Velero Contributors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package archive
+
+import (
+	"archive/tar"
+	"compress/gzip"
+	"io"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/vmware-tanzu/velero/pkg/test"
+	"github.com/vmware-tanzu/velero/pkg/util/filesystem"
+)
+
+func TestUnzipAndExtractBackup(t *testing.T) {
+	tests := []struct {
+		name      string
+		files     []string
+		IsTarball bool
+		wantErr   bool
+	}{
+		{
+			name:      "when the format of backup file is invalid, an error is returned",
+			files:     []string{},
+			IsTarball: false,
+			wantErr:   true,
+		},
+		{
+			name:      "when the backup tarball is empty, the function should work correctly and returns no error",
+			files:     []string{},
+			IsTarball: true,
+			wantErr:   false,
+		},
+		{
+			name: "when the backup tarball includes a mix of items, the function should work correctly and returns no error",
+			files: []string{
+				"root-dir/resources/namespace/cluster/example.json",
+				"root-dir/resources/pods/namespaces/example.json",
+				"root-dir/metadata/version",
+			},
+			IsTarball: true,
+			wantErr:   false,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			ext := NewExtractor(test.NewLogger(), test.NewFakeFileSystem())
+			var fileName string
+			var err error
+			if tc.IsTarball {
+				fileName, err = createArchive(tc.files, ext.fs)
+			} else {
+				fileName, err = createRegular(ext.fs)
+			}
+			require.NoError(t, err)
+
+			file, err := ext.fs.OpenFile(fileName, os.O_RDWR|os.O_CREATE, 0644)
+			require.NoError(t, err)
+
+			_, err = ext.UnzipAndExtractBackup(file.(io.Reader))
+			if tc.wantErr && (err == nil) {
+				t.Errorf("%s: wanted error but got nil", tc.name)
+			}
+
+			if !tc.wantErr && (err != nil) {
+				t.Errorf("%s: wanted no error but got err: %v", tc.name, err)
+			}
+		})
+	}
+}
+
+func createArchive(files []string, fs filesystem.Interface) (string, error) {
+	outName := "output.tar.gz"
+	out, err := fs.Create(outName)
+	if err != nil {
+		return outName, err
+	}
+	defer out.Close()
+	gw := gzip.NewWriter(out)
+	defer gw.Close()
+	tw := tar.NewWriter(gw)
+	defer tw.Close()
+
+	// Iterate over files and add them to the tar archive
+	for _, file := range files {
+		err := addToArchive(tw, file, fs)
+		if err != nil {
+			return outName, err
+		}
+	}
+
+	return outName, nil
+}
+
+func addToArchive(tw *tar.Writer, filename string, fs filesystem.Interface) error {
+	// Create the file
+	file, err := fs.Create(filename)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	// Get FileInfo about size, mode, etc.
+	info, err := fs.Stat(filename)
+	if err != nil {
+		return err
+	}
+
+	// Create a tar Header from the FileInfo data
+	header, err := tar.FileInfoHeader(info, info.Name())
+	if err != nil {
+		return err
+	}
+
+	header.Name = filename
+	err = tw.WriteHeader(header)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func createRegular(fs filesystem.Interface) (string, error) {
+	outName := "output"
+	out, err := fs.Create(outName)
+	if err != nil {
+		return outName, err
+	}
+	defer out.Close()
+
+	return outName, nil
+}

pkg/archive/filesystem.go

@@ -1,5 +1,5 @@
 /*
-Copyright 2020 the Velero contributors.
+Copyright the Velero contributors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.

pkg/archive/filesystem_test.go

@@ -1,5 +1,5 @@
 /*
-Copyright 2020 the Velero contributors.
+Copyright the Velero contributors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -20,6 +20,10 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	velerov1api "github.com/vmware-tanzu/velero/pkg/apis/velero/v1"
+	"github.com/vmware-tanzu/velero/pkg/test"
 )
 
 func TestGetItemFilePath(t *testing.T) {
@@ -47,3 +51,37 @@ func TestGetItemFilePath(t *testing.T) {
 	res = GetVersionedItemFilePath("", "resource", "", "item", "")
 	assert.Equal(t, "resources/resource/cluster/item.json", res)
 }
+
+func TestGetScopeDir(t *testing.T) {
+	res := GetScopeDir("")
+	assert.Equal(t, velerov1api.ClusterScopedDir, res)
+
+	res = GetScopeDir("test-namespace")
+	assert.Equal(t, velerov1api.NamespaceScopedDir, res)
+}
+
+func TestUnmarshal(t *testing.T) {
+	fs := test.NewFakeFileSystem()
+	filePath := "pod.json"
+	fileContent := `{
+		"apiVersion": "v1",
+		"kind": "Pod",
+		"metadata": {
+			"name": "example-pod"
+		},
+		"spec": {
+			"containers": [{
+				"name": "example-container",
+				"image": "example-image"
+			}]
+		}
+	}`
+	out, err := fs.Create(filePath)
+	require.NoError(t, err)
+
+	_, err = out.Write([]byte(fileContent))
+	require.NoError(t, err)
+
+	_, err = Unmarshal(fs, filePath)
+	require.NoError(t, err)
+}