package tz import ( "math/rand" "testing" "time" "github.com/nspcc-dev/tzhash/gf127" "github.com/stretchr/testify/require" ) func init() { rand.Seed(time.Now().UnixNano()) } func random() (a *sl2) { a = new(sl2) a[0][0] = *gf127.Random() a[0][1] = *gf127.Random() a[1][0] = *gf127.Random() // so that result is in SL2 // d = a^-1*(1+b*c) gf127.Mul(&a[0][1], &a[1][0], &a[1][1]) gf127.Add(&a[1][1], gf127.New(1, 0), &a[1][1]) t := gf127.New(0, 0) gf127.Inv(&a[0][0], t) gf127.Mul(t, &a[1][1], &a[1][1]) return } func TestSL2_MarshalBinary(t *testing.T) { var ( a = random() b = new(sl2) ) data, err := a.MarshalBinary() require.NoError(t, err) err = b.UnmarshalBinary(data) require.NoError(t, err) require.Equal(t, a, b) } func TestInv(t *testing.T) { var a, b, c *sl2 c = new(sl2) for i := 0; i < 5; i++ { a = random() b = Inv(a) c = c.Mul(a, b) require.Equal(t, id, *c) } }