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tendermint/libs/common/bit_array_test.go

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package common
import (
"bytes"
"encoding/json"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func randBitArray(bits int) (*BitArray, []byte) {
src := RandBytes((bits + 7) / 8)
bA := NewBitArray(bits)
for i := 0; i < len(src); i++ {
for j := 0; j < 8; j++ {
if i*8+j >= bits {
return bA, src
}
setBit := src[i]&(1<<uint(j)) > 0
bA.SetIndex(i*8+j, setBit)
}
}
return bA, src
}
func TestAnd(t *testing.T) {
bA1, _ := randBitArray(51)
bA2, _ := randBitArray(31)
bA3 := bA1.And(bA2)
var bNil *BitArray
require.Equal(t, bNil.And(bA1), (*BitArray)(nil))
require.Equal(t, bA1.And(nil), (*BitArray)(nil))
require.Equal(t, bNil.And(nil), (*BitArray)(nil))
if bA3.Bits != 31 {
t.Error("Expected min bits", bA3.Bits)
}
if len(bA3.Elems) != len(bA2.Elems) {
t.Error("Expected min elems length")
}
for i := 0; i < bA3.Bits; i++ {
expected := bA1.GetIndex(i) && bA2.GetIndex(i)
if bA3.GetIndex(i) != expected {
t.Error("Wrong bit from bA3", i, bA1.GetIndex(i), bA2.GetIndex(i), bA3.GetIndex(i))
}
}
}
func TestOr(t *testing.T) {
bA1, _ := randBitArray(51)
bA2, _ := randBitArray(31)
bA3 := bA1.Or(bA2)
bNil := (*BitArray)(nil)
require.Equal(t, bNil.Or(bA1), bA1)
require.Equal(t, bA1.Or(nil), bA1)
require.Equal(t, bNil.Or(nil), (*BitArray)(nil))
if bA3.Bits != 51 {
t.Error("Expected max bits")
}
if len(bA3.Elems) != len(bA1.Elems) {
t.Error("Expected max elems length")
}
for i := 0; i < bA3.Bits; i++ {
expected := bA1.GetIndex(i) || bA2.GetIndex(i)
if bA3.GetIndex(i) != expected {
t.Error("Wrong bit from bA3", i, bA1.GetIndex(i), bA2.GetIndex(i), bA3.GetIndex(i))
}
}
}
func TestSub1(t *testing.T) {
bA1, _ := randBitArray(31)
bA2, _ := randBitArray(51)
bA3 := bA1.Sub(bA2)
bNil := (*BitArray)(nil)
require.Equal(t, bNil.Sub(bA1), (*BitArray)(nil))
require.Equal(t, bA1.Sub(nil), (*BitArray)(nil))
require.Equal(t, bNil.Sub(nil), (*BitArray)(nil))
if bA3.Bits != bA1.Bits {
t.Error("Expected bA1 bits")
}
if len(bA3.Elems) != len(bA1.Elems) {
t.Error("Expected bA1 elems length")
}
for i := 0; i < bA3.Bits; i++ {
expected := bA1.GetIndex(i)
if bA2.GetIndex(i) {
expected = false
}
if bA3.GetIndex(i) != expected {
t.Error("Wrong bit from bA3", i, bA1.GetIndex(i), bA2.GetIndex(i), bA3.GetIndex(i))
}
}
}
func TestSub2(t *testing.T) {
bA1, _ := randBitArray(51)
bA2, _ := randBitArray(31)
bA3 := bA1.Sub(bA2)
bNil := (*BitArray)(nil)
require.Equal(t, bNil.Sub(bA1), (*BitArray)(nil))
require.Equal(t, bA1.Sub(nil), (*BitArray)(nil))
require.Equal(t, bNil.Sub(nil), (*BitArray)(nil))
if bA3.Bits != bA1.Bits {
t.Error("Expected bA1 bits")
}
if len(bA3.Elems) != len(bA1.Elems) {
t.Error("Expected bA1 elems length")
}
for i := 0; i < bA3.Bits; i++ {
expected := bA1.GetIndex(i)
if i < bA2.Bits && bA2.GetIndex(i) {
expected = false
}
if bA3.GetIndex(i) != expected {
t.Error("Wrong bit from bA3")
}
}
}
func TestPickRandom(t *testing.T) {
for idx := 0; idx < 123; idx++ {
bA1 := NewBitArray(123)
bA1.SetIndex(idx, true)
index, ok := bA1.PickRandom()
if !ok {
t.Fatal("Expected to pick element but got none")
}
if index != idx {
t.Fatalf("Expected to pick element at %v but got wrong index", idx)
}
}
}
func TestBytes(t *testing.T) {
bA := NewBitArray(4)
bA.SetIndex(0, true)
check := func(bA *BitArray, bz []byte) {
if !bytes.Equal(bA.Bytes(), bz) {
panic(Fmt("Expected %X but got %X", bz, bA.Bytes()))
}
}
check(bA, []byte{0x01})
bA.SetIndex(3, true)
check(bA, []byte{0x09})
bA = NewBitArray(9)
check(bA, []byte{0x00, 0x00})
bA.SetIndex(7, true)
check(bA, []byte{0x80, 0x00})
bA.SetIndex(8, true)
check(bA, []byte{0x80, 0x01})
bA = NewBitArray(16)
check(bA, []byte{0x00, 0x00})
bA.SetIndex(7, true)
check(bA, []byte{0x80, 0x00})
bA.SetIndex(8, true)
check(bA, []byte{0x80, 0x01})
bA.SetIndex(9, true)
check(bA, []byte{0x80, 0x03})
}
func TestEmptyFull(t *testing.T) {
ns := []int{47, 123}
for _, n := range ns {
bA := NewBitArray(n)
if !bA.IsEmpty() {
t.Fatal("Expected bit array to be empty")
}
for i := 0; i < n; i++ {
bA.SetIndex(i, true)
}
if !bA.IsFull() {
t.Fatal("Expected bit array to be full")
}
}
}
func TestUpdateNeverPanics(t *testing.T) {
newRandBitArray := func(n int) *BitArray {
ba, _ := randBitArray(n)
return ba
}
pairs := []struct {
a, b *BitArray
}{
{nil, nil},
{newRandBitArray(10), newRandBitArray(12)},
{newRandBitArray(23), newRandBitArray(23)},
{newRandBitArray(37), nil},
{nil, NewBitArray(10)},
}
for _, pair := range pairs {
a, b := pair.a, pair.b
a.Update(b)
b.Update(a)
}
}
func TestNewBitArrayNeverCrashesOnNegatives(t *testing.T) {
bitList := []int{-127, -128, -1 << 31}
for _, bits := range bitList {
_ = NewBitArray(bits)
}
}
func TestJSONMarshalUnmarshal(t *testing.T) {
bA1 := NewBitArray(0)
bA2 := NewBitArray(1)
bA3 := NewBitArray(1)
bA3.SetIndex(0, true)
bA4 := NewBitArray(5)
bA4.SetIndex(0, true)
bA4.SetIndex(1, true)
testCases := []struct {
bA *BitArray
marshalledBA string
}{
{nil, `null`},
{bA1, `null`},
{bA2, `"_"`},
{bA3, `"x"`},
{bA4, `"xx___"`},
}
for _, tc := range testCases {
t.Run(tc.bA.String(), func(t *testing.T) {
bz, err := json.Marshal(tc.bA)
require.NoError(t, err)
assert.Equal(t, tc.marshalledBA, string(bz))
var unmarshalledBA *BitArray
err = json.Unmarshal(bz, &unmarshalledBA)
require.NoError(t, err)
if tc.bA == nil {
require.Nil(t, unmarshalledBA)
} else {
require.NotNil(t, unmarshalledBA)
assert.EqualValues(t, tc.bA.Bits, unmarshalledBA.Bits)
if assert.EqualValues(t, tc.bA.String(), unmarshalledBA.String()) {
assert.EqualValues(t, tc.bA.Elems, unmarshalledBA.Elems)
}
}
})
}
}