--- /dev/null
+package gzip
+
+import (
+ "os"
+ "path/filepath"
+ "runtime"
+ "strings"
+ "testing"
+ "time"
+)
+
+// Per golang.org/issue/14939, check that every .gz file
+// in the tree has a zero mtime.
+func TestGZIPFilesHaveZeroMTimes(t *testing.T) {
+ var files []string
+ err := filepath.Walk(runtime.GOROOT(), func(path string, info os.FileInfo, err error) error {
+ if err != nil {
+ return err
+ }
+ if !info.IsDir() && strings.HasSuffix(path, ".gz") {
+ files = append(files, path)
+ }
+ return nil
+ })
+ if err != nil {
+ t.Fatal("error collecting list of .gz files in GOROOT: ", err)
+ }
+ if len(files) == 0 {
+ t.Fatal("expected to find some .gz files under GOROOT")
+ }
+ for _, path := range files {
+ checkZeroMTime(t, path)
+ }
+}
+
+func checkZeroMTime(t *testing.T, path string) {
+ f, err := os.Open(path)
+ if err != nil {
+ t.Error(err)
+ return
+ }
+ defer f.Close()
+ gz, err := NewReader(f)
+ if err != nil {
+ t.Errorf("cannot read gzip file %s: %s", path, err)
+ return
+ }
+ defer gz.Close()
+ if !gz.ModTime.Equal(time.Unix(0, 0)) {
+ t.Errorf("gzip file %s has non-zero mtime (%s)", path, gz.ModTime)
+ }
+}