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// Copyright 2022 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License.
//go:build go1.15
// +build go1.15
package apd
import (
"testing"
"testing/quick"
)
// TestBigIntMatchesMathBigInt15 is like TestBigIntMatchesMathBigInt, but for
// parts of the shared BigInt/big.Int API that were introduced in go1.15.
func TestBigIntMatchesMathBigInt15(t *testing.T) {
t.Run("FillBytes", func(t *testing.T) {
apd := func(z number) []byte {
return z.toApd(t).FillBytes(make([]byte, len(z)))
}
math := func(z number) []byte {
return z.toMath(t).FillBytes(make([]byte, len(z)))
}
require(t, quick.CheckEqual(apd, math, nil))
})
}
//////////////////////////////////////////////////////////////////////////////////
// The following tests were copied from the standard library's math/big package //
//////////////////////////////////////////////////////////////////////////////////
func TestBigIntFillBytes(t *testing.T) {
checkResult := func(t *testing.T, buf []byte, want *BigInt) {
t.Helper()
got := new(BigInt).SetBytes(buf)
if got.CmpAbs(want) != 0 {
t.Errorf("got 0x%x, want 0x%x: %x", got, want, buf)
}
}
panics := func(f func()) (panic bool) {
defer func() { panic = recover() != nil }()
f()
return
}
for _, n := range []string{
"0",
"1000",
"0xffffffff",
"-0xffffffff",
"0xffffffffffffffff",
"0x10000000000000000",
"0xabababababababababababababababababababababababababa",
"0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
} {
t.Run(n, func(t *testing.T) {
t.Logf(n)
x, ok := new(BigInt).SetString(n, 0)
if !ok {
panic("invalid test entry")
}
// Perfectly sized buffer.
byteLen := (x.BitLen() + 7) / 8
buf := make([]byte, byteLen)
checkResult(t, x.FillBytes(buf), x)
// Way larger, checking all bytes get zeroed.
buf = make([]byte, 100)
for i := range buf {
buf[i] = 0xff
}
checkResult(t, x.FillBytes(buf), x)
// Too small.
if byteLen > 0 {
buf = make([]byte, byteLen-1)
if !panics(func() { x.FillBytes(buf) }) {
t.Errorf("expected panic for small buffer and value %x", x)
}
}
})
}
}
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