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},

	}
	dst := m.rand(len(b))
	n := m.chooseLen(len(b) - dst)
	rb := byte(m.rand(256))
	for i := dst; i < dst+n; i++ {
		b[i] = rb
	}
	return b
}

// byteSliceShuffleBytes shuffles a chunk of bytes in b.
func byteSliceShuffleBytes(m *mutator, b []byte) []byte {
	if len(b) <= 1 {
		return nil
	}
	dst := m.rand(len(b))
	n := m.chooseLen(len(b) - dst)
	if n <= 2 {
		return nil
	}

	byteSliceArithmeticUint64,
	byteSliceOverwriteInterestingUint8,
	byteSliceOverwriteInterestingUint16,
	byteSliceOverwriteInterestingUint32,
	byteSliceInsertConstantBytes,
	byteSliceOverwriteConstantBytes,
	byteSliceShuffleBytes,
	byteSliceSwapBytes,
}

func (m *mutator) mutateBytes(ptrB *[]byte) {
	b := *ptrB
	defer func() {
		if unsafe.SliceData(*ptrB) != unsafe.SliceData(b) {
			panic("data moved to new address")