+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !plan9,!windows,!js
+
+package renameio
+
+import (
+ "io/ioutil"
+ "os"
+ "path/filepath"
+ "syscall"
+ "testing"
+)
+
+func TestWriteFileModeAppliesUmask(t *testing.T) {
+ dir, err := ioutil.TempDir("", "renameio")
+ if err != nil {
+ t.Fatalf("Failed to create temporary directory: %v", err)
+ }
+ defer os.RemoveAll(dir)
+
+ const mode = 0644
+ const umask = 0007
+ defer syscall.Umask(syscall.Umask(umask))
+
+ file := filepath.Join(dir, "testWrite")
+ err = WriteFile(file, []byte("go-build"), mode)
+ if err != nil {
+ t.Fatalf("Failed to write file: %v", err)
+ }
+
+ fi, err := os.Stat(file)
+ if err != nil {
+ t.Fatalf("Stat %q (looking for mode %#o): %s", file, mode, err)
+ }
+
+ if fi.Mode()&os.ModePerm != 0640 {
+ t.Errorf("Stat %q: mode %#o want %#o", file, fi.Mode()&os.ModePerm, 0640)
+ }
+}