fs: use testing.TempDir

Change-Id: Ia0d7293d14bb4fdac9be913ba6bd92b836636070

fs/forget_test.go

@@ -79,11 +79,7 @@ func TestForget(t *testing.T) {
 		EntryTimeout:      &sec,
 	}
 	options.Debug = testutil.VerboseTest()
-	dir, err := ioutil.TempDir("", "TestForget")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(dir)
+	dir := t.TempDir()
 
 	rawFS := NewNodeFS(root, options)
 	server, err := fuse.NewServer(rawFS, dir, &options.MountOptions)

fs/windows_test.go

@@ -17,16 +17,8 @@ import (
 )
 
 func TestWindowsEmulations(t *testing.T) {
-	mntDir, err := ioutil.TempDir("", "ZipFS")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(mntDir)
-	origDir, err := ioutil.TempDir("", "ZipFS")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(origDir)
+	mntDir := t.TempDir()
+	origDir := t.TempDir()
 
 	rootData := &fs.LoopbackRoot{
 		NewNode: newWindowsNode,

fs/zip_test.go

@@ -59,10 +59,7 @@ func TestZipFS(t *testing.T) {
 	}
 
 	root := &zipRoot{zr: r}
-	mntDir, err := ioutil.TempDir("", "ZipFS")
-	if err != nil {
-		t.Fatal(err)
-	}
+	mntDir := t.TempDir()
 	server, err := fs.Mount(mntDir, root, nil)
 	if err != nil {
 		t.Fatal(err)
@@ -108,10 +105,7 @@ func TestZipFSOnAdd(t *testing.T) {
 	zr := &zipRoot{zr: r}
 
 	root := &fs.Inode{}
-	mnt, err := ioutil.TempDir("", "ZipFS")
-	if err != nil {
-		t.Fatal(err)
-	}
+	mnt := t.TempDir()
 	server, err := fs.Mount(mnt, root, &fs.Options{
 		OnAdd: func(ctx context.Context) {
 			root.AddChild("sub",