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256 lines
5.8 KiB
256 lines
5.8 KiB
package common
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"testing"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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func randBitArray(bits int) (*BitArray, []byte) {
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src := RandBytes((bits + 7) / 8)
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bA := NewBitArray(bits)
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for i := 0; i < len(src); i++ {
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for j := 0; j < 8; j++ {
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if i*8+j >= bits {
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return bA, src
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}
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setBit := src[i]&(1<<uint(j)) > 0
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bA.SetIndex(i*8+j, setBit)
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}
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}
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return bA, src
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}
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func TestAnd(t *testing.T) {
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bA1, _ := randBitArray(51)
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bA2, _ := randBitArray(31)
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bA3 := bA1.And(bA2)
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var bNil *BitArray
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require.Equal(t, bNil.And(bA1), (*BitArray)(nil))
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require.Equal(t, bA1.And(nil), (*BitArray)(nil))
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require.Equal(t, bNil.And(nil), (*BitArray)(nil))
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if bA3.Bits != 31 {
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t.Error("Expected min bits", bA3.Bits)
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}
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if len(bA3.Elems) != len(bA2.Elems) {
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t.Error("Expected min elems length")
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}
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for i := 0; i < bA3.Bits; i++ {
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expected := bA1.GetIndex(i) && bA2.GetIndex(i)
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if bA3.GetIndex(i) != expected {
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t.Error("Wrong bit from bA3", i, bA1.GetIndex(i), bA2.GetIndex(i), bA3.GetIndex(i))
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}
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}
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}
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func TestOr(t *testing.T) {
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bA1, _ := randBitArray(51)
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bA2, _ := randBitArray(31)
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bA3 := bA1.Or(bA2)
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bNil := (*BitArray)(nil)
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require.Equal(t, bNil.Or(bA1), bA1)
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require.Equal(t, bA1.Or(nil), bA1)
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require.Equal(t, bNil.Or(nil), (*BitArray)(nil))
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if bA3.Bits != 51 {
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t.Error("Expected max bits")
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}
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if len(bA3.Elems) != len(bA1.Elems) {
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t.Error("Expected max elems length")
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}
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for i := 0; i < bA3.Bits; i++ {
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expected := bA1.GetIndex(i) || bA2.GetIndex(i)
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if bA3.GetIndex(i) != expected {
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t.Error("Wrong bit from bA3", i, bA1.GetIndex(i), bA2.GetIndex(i), bA3.GetIndex(i))
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}
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}
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}
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func TestSub(t *testing.T) {
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testCases := []struct {
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initBA string
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subtractingBA string
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expectedBA string
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}{
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{`null`, `null`, `null`},
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{`"x"`, `null`, `null`},
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{`null`, `"x"`, `null`},
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{`"x"`, `"x"`, `"_"`},
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{`"xxxxxx"`, `"x_x_x_"`, `"_x_x_x"`},
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{`"x_x_x_"`, `"xxxxxx"`, `"______"`},
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{`"xxxxxx"`, `"x_x_x_xxxx"`, `"_x_x_x"`},
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{`"x_x_x_xxxx"`, `"xxxxxx"`, `"______xxxx"`},
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{`"xxxxxxxxxx"`, `"x_x_x_"`, `"_x_x_xxxxx"`},
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{`"x_x_x_"`, `"xxxxxxxxxx"`, `"______"`},
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}
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for _, tc := range testCases {
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var bA *BitArray
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err := json.Unmarshal([]byte(tc.initBA), &bA)
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require.Nil(t, err)
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var o *BitArray
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err = json.Unmarshal([]byte(tc.subtractingBA), &o)
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require.Nil(t, err)
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got, _ := json.Marshal(bA.Sub(o))
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require.Equal(t, tc.expectedBA, string(got), "%s minus %s doesn't equal %s", tc.initBA, tc.subtractingBA, tc.expectedBA)
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}
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}
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func TestPickRandom(t *testing.T) {
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empty16Bits := "________________"
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empty64Bits := empty16Bits + empty16Bits + empty16Bits + empty16Bits
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testCases := []struct {
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bA string
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ok bool
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}{
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{`null`, false},
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{`"x"`, true},
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{`"` + empty16Bits + `"`, false},
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{`"x` + empty16Bits + `"`, true},
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{`"` + empty16Bits + `x"`, true},
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{`"x` + empty16Bits + `x"`, true},
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{`"` + empty64Bits + `"`, false},
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{`"x` + empty64Bits + `"`, true},
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{`"` + empty64Bits + `x"`, true},
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{`"x` + empty64Bits + `x"`, true},
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}
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for _, tc := range testCases {
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var bitArr *BitArray
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err := json.Unmarshal([]byte(tc.bA), &bitArr)
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require.NoError(t, err)
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_, ok := bitArr.PickRandom()
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require.Equal(t, tc.ok, ok, "PickRandom got an unexpected result on input %s", tc.bA)
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}
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}
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func TestBytes(t *testing.T) {
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bA := NewBitArray(4)
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bA.SetIndex(0, true)
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check := func(bA *BitArray, bz []byte) {
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if !bytes.Equal(bA.Bytes(), bz) {
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panic(fmt.Sprintf("Expected %X but got %X", bz, bA.Bytes()))
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}
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}
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check(bA, []byte{0x01})
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bA.SetIndex(3, true)
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check(bA, []byte{0x09})
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bA = NewBitArray(9)
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check(bA, []byte{0x00, 0x00})
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bA.SetIndex(7, true)
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check(bA, []byte{0x80, 0x00})
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bA.SetIndex(8, true)
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check(bA, []byte{0x80, 0x01})
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bA = NewBitArray(16)
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check(bA, []byte{0x00, 0x00})
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bA.SetIndex(7, true)
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check(bA, []byte{0x80, 0x00})
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bA.SetIndex(8, true)
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check(bA, []byte{0x80, 0x01})
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bA.SetIndex(9, true)
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check(bA, []byte{0x80, 0x03})
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}
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func TestEmptyFull(t *testing.T) {
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ns := []int{47, 123}
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for _, n := range ns {
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bA := NewBitArray(n)
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if !bA.IsEmpty() {
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t.Fatal("Expected bit array to be empty")
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}
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for i := 0; i < n; i++ {
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bA.SetIndex(i, true)
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}
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if !bA.IsFull() {
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t.Fatal("Expected bit array to be full")
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}
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}
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}
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func TestUpdateNeverPanics(t *testing.T) {
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newRandBitArray := func(n int) *BitArray {
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ba, _ := randBitArray(n)
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return ba
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}
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pairs := []struct {
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a, b *BitArray
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}{
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{nil, nil},
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{newRandBitArray(10), newRandBitArray(12)},
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{newRandBitArray(23), newRandBitArray(23)},
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{newRandBitArray(37), nil},
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{nil, NewBitArray(10)},
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}
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for _, pair := range pairs {
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a, b := pair.a, pair.b
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a.Update(b)
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b.Update(a)
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}
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}
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func TestNewBitArrayNeverCrashesOnNegatives(t *testing.T) {
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bitList := []int{-127, -128, -1 << 31}
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for _, bits := range bitList {
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_ = NewBitArray(bits)
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}
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}
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func TestJSONMarshalUnmarshal(t *testing.T) {
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bA1 := NewBitArray(0)
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bA2 := NewBitArray(1)
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bA3 := NewBitArray(1)
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bA3.SetIndex(0, true)
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bA4 := NewBitArray(5)
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bA4.SetIndex(0, true)
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bA4.SetIndex(1, true)
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testCases := []struct {
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bA *BitArray
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marshalledBA string
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}{
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{nil, `null`},
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{bA1, `null`},
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{bA2, `"_"`},
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{bA3, `"x"`},
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{bA4, `"xx___"`},
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}
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for _, tc := range testCases {
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t.Run(tc.bA.String(), func(t *testing.T) {
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bz, err := json.Marshal(tc.bA)
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require.NoError(t, err)
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assert.Equal(t, tc.marshalledBA, string(bz))
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var unmarshalledBA *BitArray
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err = json.Unmarshal(bz, &unmarshalledBA)
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require.NoError(t, err)
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if tc.bA == nil {
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require.Nil(t, unmarshalledBA)
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} else {
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require.NotNil(t, unmarshalledBA)
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assert.EqualValues(t, tc.bA.Bits, unmarshalledBA.Bits)
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if assert.EqualValues(t, tc.bA.String(), unmarshalledBA.String()) {
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assert.EqualValues(t, tc.bA.Elems, unmarshalledBA.Elems)
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}
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}
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})
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}
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}
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