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// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package fuzz
import (
"bytes"
"testing"
)
type mockRand struct {
values []int
counter int
b bool
}
func (mr *mockRand) uint32() uint32 {
c := mr.values[mr.counter]
mr.counter++
return uint32(c)
}
func (mr *mockRand) intn(n int) int {
c := mr.values[mr.counter]
mr.counter++
return c % n
}
func (mr *mockRand) uint32n(n uint32) uint32 {
c := mr.values[mr.counter]
mr.counter++
return uint32(c) % n
}
func (mr *mockRand) exp2() int {
c := mr.values[mr.counter]
mr.counter++
return c
}
func (mr *mockRand) bool() bool {
b := mr.b
mr.b = !mr.b
return b
}
func (mr *mockRand) save(*uint64, *uint64) {
panic("unimplemented")
}
func (mr *mockRand) restore(uint64, uint64) {
panic("unimplemented")
}
func TestByteSliceMutators(t *testing.T) {
for _, tc := range []struct {
name string
mutator func(*mutator, []byte) []byte
randVals []int
input []byte
expected []byte
}{
{
name: "byteSliceRemoveBytes",
mutator: byteSliceRemoveBytes,
input: []byte{1, 2, 3, 4},
expected: []byte{4},
},
{
name: "byteSliceInsertRandomBytes",
mutator: byteSliceInsertRandomBytes,
input: make([]byte, 4, 8),
expected: []byte{3, 4, 5, 0, 0, 0, 0},
},
{
name: "byteSliceDuplicateBytes",
mutator: byteSliceDuplicateBytes,
input: append(make([]byte, 0, 13), []byte{1, 2, 3, 4}...),
expected: []byte{1, 1, 2, 3, 4, 2, 3, 4},
},
{
name: "byteSliceOverwriteBytes",
mutator: byteSliceOverwriteBytes,
input: []byte{1, 2, 3, 4},
expected: []byte{1, 1, 3, 4},
},
{
name: "byteSliceBitFlip",
mutator: byteSliceBitFlip,
input: []byte{1, 2, 3, 4},
expected: []byte{3, 2, 3, 4},
},
{
name: "byteSliceXORByte",
mutator: byteSliceXORByte,
input: []byte{1, 2, 3, 4},
expected: []byte{3, 2, 3, 4},
},
{
name: "byteSliceSwapByte",
mutator: byteSliceSwapByte,
input: []byte{1, 2, 3, 4},
expected: []byte{2, 1, 3, 4},
},
{
name: "byteSliceArithmeticUint8",
mutator: byteSliceArithmeticUint8,
input: []byte{1, 2, 3, 4},
expected: []byte{255, 2, 3, 4},
},
{
name: "byteSliceArithmeticUint16",
mutator: byteSliceArithmeticUint16,
input: []byte{1, 2, 3, 4},
expected: []byte{1, 3, 3, 4},
},
{
name: "byteSliceArithmeticUint32",
mutator: byteSliceArithmeticUint32,
input: []byte{1, 2, 3, 4},
expected: []byte{2, 2, 3, 4},
},
{
name: "byteSliceArithmeticUint64",
mutator: byteSliceArithmeticUint64,
input: []byte{1, 2, 3, 4, 5, 6, 7, 8},
expected: []byte{2, 2, 3, 4, 5, 6, 7, 8},
},
{
name: "byteSliceOverwriteInterestingUint8",
mutator: byteSliceOverwriteInterestingUint8,
input: []byte{1, 2, 3, 4},
expected: []byte{255, 2, 3, 4},
},
{
name: "byteSliceOverwriteInterestingUint16",
mutator: byteSliceOverwriteInterestingUint16,
input: []byte{1, 2, 3, 4},
expected: []byte{255, 127, 3, 4},
},
{
name: "byteSliceOverwriteInterestingUint32",
mutator: byteSliceOverwriteInterestingUint32,
input: []byte{1, 2, 3, 4},
expected: []byte{250, 0, 0, 250},
},
{
name: "byteSliceInsertConstantBytes",
mutator: byteSliceInsertConstantBytes,
input: append(make([]byte, 0, 8), []byte{1, 2, 3, 4}...),
expected: []byte{3, 3, 3, 1, 2, 3, 4},
},
{
name: "byteSliceOverwriteConstantBytes",
mutator: byteSliceOverwriteConstantBytes,
input: []byte{1, 2, 3, 4},
expected: []byte{3, 3, 3, 4},
},
{
name: "byteSliceShuffleBytes",
mutator: byteSliceShuffleBytes,
input: []byte{1, 2, 3, 4},
expected: []byte{2, 3, 1, 4},
},
{
name: "byteSliceSwapBytes",
mutator: byteSliceSwapBytes,
randVals: []int{0, 2, 0, 2},
input: append(make([]byte, 0, 9), []byte{1, 2, 3, 4}...),
expected: []byte{3, 2, 1, 4},
},
} {
t.Run(tc.name, func(t *testing.T) {
r := &mockRand{values: []int{0, 1, 2, 3, 4, 5}}
if tc.randVals != nil {
r.values = tc.randVals
}
m := &mutator{r: r}
b := tc.mutator(m, tc.input)
if !bytes.Equal(b, tc.expected) {
t.Errorf("got %x, want %x", b, tc.expected)
}
})
}
}
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