197 lines
5.6 KiB
Go
197 lines
5.6 KiB
Go
|
// Copyright 2014 The go-ethereum Authors
|
||
|
// This file is part of the go-ethereum library.
|
||
|
//
|
||
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
||
|
// it under the terms of the GNU Lesser General Public License as published by
|
||
|
// the Free Software Foundation, either version 3 of the License, or
|
||
|
// (at your option) any later version.
|
||
|
//
|
||
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
||
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
// GNU Lesser General Public License for more details.
|
||
|
//
|
||
|
// You should have received a copy of the GNU Lesser General Public License
|
||
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
||
|
package math
|
||
|
|
||
|
import (
|
||
|
"bytes"
|
||
|
"math/big"
|
||
|
"testing"
|
||
|
)
|
||
|
|
||
|
func TestParseBig256(t *testing.T) {
|
||
|
tests := []struct {
|
||
|
input string
|
||
|
num *big.Int
|
||
|
ok bool
|
||
|
}{
|
||
|
{"", big.NewInt(0), true},
|
||
|
{"0", big.NewInt(0), true},
|
||
|
{"0x0", big.NewInt(0), true},
|
||
|
{"12345678", big.NewInt(12345678), true},
|
||
|
{"0x12345678", big.NewInt(0x12345678), true},
|
||
|
{"0X12345678", big.NewInt(0x12345678), true},
|
||
|
// Tests for leading zero behaviour:
|
||
|
{"0123456789", big.NewInt(123456789), true}, // note: not octal
|
||
|
{"00", big.NewInt(0), true},
|
||
|
{"0x00", big.NewInt(0), true},
|
||
|
{"0x012345678abc", big.NewInt(0x12345678abc), true},
|
||
|
// Invalid syntax:
|
||
|
{"abcdef", nil, false},
|
||
|
{"0xgg", nil, false},
|
||
|
// Larger than 256 bits:
|
||
|
{"115792089237316195423570985008687907853269984665640564039457584007913129639936", nil, false},
|
||
|
}
|
||
|
for _, test := range tests {
|
||
|
num, ok := ParseBig256(test.input)
|
||
|
if ok != test.ok {
|
||
|
t.Errorf("ParseBig(%q) -> ok = %t, want %t", test.input, ok, test.ok)
|
||
|
continue
|
||
|
}
|
||
|
if num != nil && test.num != nil && num.Cmp(test.num) != 0 {
|
||
|
t.Errorf("ParseBig(%q) -> %d, want %d", test.input, num, test.num)
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
func TestMustParseBig256(t *testing.T) {
|
||
|
defer func() {
|
||
|
if recover() == nil {
|
||
|
t.Error("MustParseBig should've panicked")
|
||
|
}
|
||
|
}()
|
||
|
MustParseBig256("ggg")
|
||
|
}
|
||
|
|
||
|
func TestBigMax(t *testing.T) {
|
||
|
a := big.NewInt(10)
|
||
|
b := big.NewInt(5)
|
||
|
|
||
|
max1 := BigMax(a, b)
|
||
|
if max1 != a {
|
||
|
t.Errorf("Expected %d got %d", a, max1)
|
||
|
}
|
||
|
|
||
|
max2 := BigMax(b, a)
|
||
|
if max2 != a {
|
||
|
t.Errorf("Expected %d got %d", a, max2)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
func TestBigMin(t *testing.T) {
|
||
|
a := big.NewInt(10)
|
||
|
b := big.NewInt(5)
|
||
|
|
||
|
min1 := BigMin(a, b)
|
||
|
if min1 != b {
|
||
|
t.Errorf("Expected %d got %d", b, min1)
|
||
|
}
|
||
|
|
||
|
min2 := BigMin(b, a)
|
||
|
if min2 != b {
|
||
|
t.Errorf("Expected %d got %d", b, min2)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
func TestFirstBigSet(t *testing.T) {
|
||
|
tests := []struct {
|
||
|
num *big.Int
|
||
|
ix int
|
||
|
}{
|
||
|
{big.NewInt(0), 0},
|
||
|
{big.NewInt(1), 0},
|
||
|
{big.NewInt(2), 1},
|
||
|
{big.NewInt(0x100), 8},
|
||
|
}
|
||
|
for _, test := range tests {
|
||
|
if ix := FirstBitSet(test.num); ix != test.ix {
|
||
|
t.Errorf("FirstBitSet(b%b) = %d, want %d", test.num, ix, test.ix)
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
func TestPaddedBigBytes(t *testing.T) {
|
||
|
tests := []struct {
|
||
|
num *big.Int
|
||
|
n int
|
||
|
result []byte
|
||
|
}{
|
||
|
{num: big.NewInt(0), n: 4, result: []byte{0, 0, 0, 0}},
|
||
|
{num: big.NewInt(1), n: 4, result: []byte{0, 0, 0, 1}},
|
||
|
{num: big.NewInt(512), n: 4, result: []byte{0, 0, 2, 0}},
|
||
|
{num: BigPow(2, 32), n: 4, result: []byte{1, 0, 0, 0, 0}},
|
||
|
}
|
||
|
for _, test := range tests {
|
||
|
if result := PaddedBigBytes(test.num, test.n); !bytes.Equal(result, test.result) {
|
||
|
t.Errorf("PaddedBigBytes(%d, %d) = %v, want %v", test.num, test.n, result, test.result)
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
func TestU256(t *testing.T) {
|
||
|
tests := []struct{ x, y *big.Int }{
|
||
|
{x: big.NewInt(0), y: big.NewInt(0)},
|
||
|
{x: big.NewInt(1), y: big.NewInt(1)},
|
||
|
{x: BigPow(2, 255), y: BigPow(2, 255)},
|
||
|
{x: BigPow(2, 256), y: big.NewInt(0)},
|
||
|
{x: new(big.Int).Add(BigPow(2, 256), big.NewInt(1)), y: big.NewInt(1)},
|
||
|
// negative values
|
||
|
{x: big.NewInt(-1), y: new(big.Int).Sub(BigPow(2, 256), big.NewInt(1))},
|
||
|
{x: big.NewInt(-2), y: new(big.Int).Sub(BigPow(2, 256), big.NewInt(2))},
|
||
|
{x: BigPow(2, -255), y: big.NewInt(1)},
|
||
|
}
|
||
|
for _, test := range tests {
|
||
|
if y := U256(new(big.Int).Set(test.x)); y.Cmp(test.y) != 0 {
|
||
|
t.Errorf("U256(%x) = %x, want %x", test.x, y, test.y)
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
func TestS256(t *testing.T) {
|
||
|
tests := []struct{ x, y *big.Int }{
|
||
|
{x: big.NewInt(0), y: big.NewInt(0)},
|
||
|
{x: big.NewInt(1), y: big.NewInt(1)},
|
||
|
{x: big.NewInt(2), y: big.NewInt(2)},
|
||
|
{
|
||
|
x: new(big.Int).Sub(BigPow(2, 255), big.NewInt(1)),
|
||
|
y: new(big.Int).Sub(BigPow(2, 255), big.NewInt(1)),
|
||
|
},
|
||
|
{
|
||
|
x: BigPow(2, 255),
|
||
|
y: new(big.Int).Neg(BigPow(2, 255)),
|
||
|
},
|
||
|
{
|
||
|
x: new(big.Int).Sub(BigPow(2, 256), big.NewInt(1)),
|
||
|
y: big.NewInt(-1),
|
||
|
},
|
||
|
{
|
||
|
x: new(big.Int).Sub(BigPow(2, 256), big.NewInt(2)),
|
||
|
y: big.NewInt(-2),
|
||
|
},
|
||
|
}
|
||
|
for _, test := range tests {
|
||
|
if y := S256(test.x); y.Cmp(test.y) != 0 {
|
||
|
t.Errorf("S256(%x) = %x, want %x", test.x, y, test.y)
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
func TestExp(t *testing.T) {
|
||
|
tests := []struct{ base, exponent, result *big.Int }{
|
||
|
{base: big.NewInt(0), exponent: big.NewInt(0), result: big.NewInt(1)},
|
||
|
{base: big.NewInt(1), exponent: big.NewInt(0), result: big.NewInt(1)},
|
||
|
{base: big.NewInt(1), exponent: big.NewInt(1), result: big.NewInt(1)},
|
||
|
{base: big.NewInt(1), exponent: big.NewInt(2), result: big.NewInt(1)},
|
||
|
{base: big.NewInt(3), exponent: big.NewInt(144), result: MustParseBig256("507528786056415600719754159741696356908742250191663887263627442114881")},
|
||
|
{base: big.NewInt(2), exponent: big.NewInt(255), result: MustParseBig256("57896044618658097711785492504343953926634992332820282019728792003956564819968")},
|
||
|
}
|
||
|
for _, test := range tests {
|
||
|
if result := Exp(test.base, test.exponent); result.Cmp(test.result) != 0 {
|
||
|
t.Errorf("Exp(%d, %d) = %d, want %d", test.base, test.exponent, result, test.result)
|
||
|
}
|
||
|
}
|
||
|
}
|