}
			if fields != c.totalFields {
				t.Errorf("Case %d failed: expected %v results %v", i, c.totalFields, fields)
			}
		})
	}
}

type errReader struct {
	err error
}

func (e errReader) Read(p []byte) (n int, err error) {
	return 0, e.err
}

func TestReadFailures(t *testing.T) {
	customErr := errors.New("unable to read file :(")
	cases := []struct {

	if !ok {
		return "", "", s, ErrHeader
	}

	// Parse the first token as a decimal integer.
	n, perr := strconv.ParseInt(nStr, 10, 0) // Intentionally parse as native int
	if perr != nil || n < 5 || n > int64(len(s)) {
		return "", "", s, ErrHeader
	}
	n -= int64(len(nStr) + 1) // convert from index in s to index in rest
	if n <= 0 {
		return "", "", s, ErrHeader
	}

				}
				hdr.Xattrs[k[len(paxSchilyXattr):]] = v
			}
		}
		if err != nil {
			return ErrHeader
		}
	}
	hdr.PAXRecords = paxHdrs
	return nil
}

// parsePAX parses PAX headers.
// If an extended header (type 'x') is invalid, ErrHeader is returned.
func parsePAX(r io.Reader) (map[string]string, error) {
	buf, err := readSpecialFile(r)
	if err != nil {
		return nil, err

	}
	var r io.Reader

	switch compType {
	case noneType:
		r = scannedReader
	case gzipType:
		gzr, err := gzip.NewReader(scannedReader)
		if err != nil {
			if errors.Is(err, gzip.ErrHeader) || errors.Is(err, gzip.ErrChecksum) {
				return nil, errInvalidCompression(err, compType)
			}
			return nil, errTruncatedInput(err)
		}
		r = gzr
		pr.closer = gzr
	case bzip2Type:

pkg testing/fstest, type MapFile struct, ModTime time.Time
pkg testing/fstest, type MapFile struct, Mode fs.FileMode
pkg testing/fstest, type MapFile struct, Sys interface{}
pkg testing/iotest, func ErrReader(error) io.Reader
pkg testing/iotest, func TestReader(io.Reader, []uint8) error
pkg text/template, func ParseFS(fs.FS, ...string) (*Template, error)