52 lines
1 KiB
Go
52 lines
1 KiB
Go
//go:build go1.18
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// +build go1.18
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package bigint
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import (
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"bytes"
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"crypto/rand"
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"math/big"
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"testing"
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"github.com/stretchr/testify/require"
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)
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func FuzzFromBytes(f *testing.F) {
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for _, tc := range testCases {
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f.Add(tc.buf)
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}
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for i := 0; i < 50; i++ {
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for j := 1; j < MaxBytesLen; j++ {
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b := make([]byte, j)
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_, err := rand.Read(b)
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require.NoError(f, err)
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f.Add(b)
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}
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}
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f.Fuzz(func(t *testing.T, raw []byte) {
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var bi *big.Int
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require.NotPanics(t, func() { bi = FromBytes(raw) })
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var actual []byte
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require.NotPanics(t, func() { actual = ToBytes(bi) })
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require.True(t, len(actual) <= len(raw), "actual: %x, raw: %x", actual, raw)
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require.True(t, bytes.Equal(actual, raw[:len(actual)]), "actual: %x, raw: %x", actual, raw)
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if len(actual) == len(raw) {
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return
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}
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var b byte
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if bi.Sign() == -1 {
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b = 0xFF
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}
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for i := len(actual); i < len(raw); i++ {
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require.Equal(t, b, raw[i], "invalid prefix")
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}
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newRaw := ToBytes(bi)
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newBi := FromBytes(newRaw)
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require.Equal(t, bi, newBi)
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})
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}
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