type ZipTest struct {
	Name     string
	Source   func() (r io.ReaderAt, size int64) // if non-nil, used instead of testdata/<Name> file
	Comment  string
	File     []ZipTestFile
	Obscured bool  // needed for Apple notarization (golang.org/issue/34986)
	Error    error // the error that Opening this file should return
}

type ZipTestFile struct {
	Name     string
	Mode     fs.FileMode
	NonUTF8  bool
	ModTime  time.Time
	Modified time.Time

		file: "testdata/pax-records.tar",
		headers: []*Header{{
			Typeflag: TypeReg,
			Name:     "file",
			Uname:    strings.Repeat("long", 10),
			ModTime:  time.Unix(0, 0),
			PAXRecords: map[string]string{
				"GOLANG.pkg": "tar",
				"comment":    "Hello, 世界",
				"uname":      strings.Repeat("long", 10),
			},
			Format: FormatPAX,
		}},
	}, {
		file: "testdata/pax-global-records.tar",
		headers: []*Header{{

}

func TestEmptyReaderConcurrent(t *testing.T) {
	// Test for the race detector, to verify a Read that doesn't yield any bytes
	// is okay to use from multiple goroutines. This was our historic behavior.
	// See golang.org/issue/7856
	r := NewReader([]byte{})
	var wg sync.WaitGroup
	for i := 0; i < 5; i++ {
		wg.Add(2)
		go func() {
			defer wg.Done()
			var buf [1]byte
			r.Read(buf[:])
		}()
		go func() {