}
		d.idx += offset
	case io.SeekEnd:
		if d.length+offset < 0 {
			return 0, errors.New("Invalid offset")
		}
		d.idx = d.length + offset
	}
	return d.idx, nil
}

func TestDummyDataGenerator(t *testing.T) {
	readAll := func(r io.Reader) string {
		b, _ := io.ReadAll(r)
		return string(b)
	}
	checkEq := func(a, b string) {
		if a != b {
			t.Fatalf("Unexpected equality failure")
		}