r := NewReader(byteBuf)
	// Read them back with ReadRune
	for r1 := rune(0); r1 < NRune; r1++ {
		size := utf8.EncodeRune(buf, r1)
		nr, nbytes, err := r.ReadRune()
		if nr != r1 || nbytes != size || err != nil {
			t.Fatalf("ReadRune(0x%x) got 0x%x,%d not 0x%x,%d (err=%s)", r1, nr, nbytes, r1, size, err)
		}
	}
}

func TestWriteInvalidRune(t *testing.T) {

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