t.Fatalf("value differs from expected")
	}
	if lc.Len() != 1 {
		t.Fatalf("length differs from expected")
	}
}

func getRand(tb testing.TB) int64 {
	out, err := rand.Int(rand.Reader, big.NewInt(math.MaxInt64))
	if err != nil {
		tb.Fatal(err)
	}
	return out.Int64()