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201 lines
4.8 KiB

package bitarray
import (
"encoding/json"
"math/rand"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
cmn "github.com/tendermint/tendermint/libs/common"
)
func randCompactBitArray(bits int) (*CompactBitArray, []byte) {
numBytes := (bits + 7) / 8
src := cmn.RandBytes((bits + 7) / 8)
bA := NewCompactBitArray(bits)
for i := 0; i < numBytes-1; i++ {
for j := uint8(0); j < 8; j++ {
bA.SetIndex(i*8+int(j), src[i]&(uint8(1)<<(8-j)) > 0)
}
}
// Set remaining bits
for i := uint8(0); i < 8-bA.ExtraBitsStored; i++ {
bA.SetIndex(numBytes*8+int(i), src[numBytes-1]&(uint8(1)<<(8-i)) > 0)
}
return bA, src
}
func TestNewBitArrayNeverCrashesOnNegatives(t *testing.T) {
bitList := []int{-127, -128, -1 << 31}
for _, bits := range bitList {
bA := NewCompactBitArray(bits)
require.Nil(t, bA)
}
}
func TestJSONMarshalUnmarshal(t *testing.T) {
bA1 := NewCompactBitArray(0)
bA2 := NewCompactBitArray(1)
bA3 := NewCompactBitArray(1)
bA3.SetIndex(0, true)
bA4 := NewCompactBitArray(5)
bA4.SetIndex(0, true)
bA4.SetIndex(1, true)
bA5 := NewCompactBitArray(9)
bA5.SetIndex(0, true)
bA5.SetIndex(1, true)
bA5.SetIndex(8, true)
bA6 := NewCompactBitArray(16)
bA6.SetIndex(0, true)
bA6.SetIndex(1, true)
bA6.SetIndex(8, false)
bA6.SetIndex(15, true)
testCases := []struct {
bA *CompactBitArray
marshalledBA string
}{
{nil, `null`},
{bA1, `null`},
{bA2, `"_"`},
{bA3, `"x"`},
{bA4, `"xx___"`},
{bA5, `"xx______x"`},
{bA6, `"xx_____________x"`},
}
for _, tc := range testCases {
tc := tc
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 *CompactBitArray
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.Elems, unmarshalledBA.Elems)
if assert.EqualValues(t, tc.bA.String(), unmarshalledBA.String()) {
assert.EqualValues(t, tc.bA.Elems, unmarshalledBA.Elems)
}
}
})
}
}
func TestCompactMarshalUnmarshal(t *testing.T) {
bA1 := NewCompactBitArray(0)
bA2 := NewCompactBitArray(1)
bA3 := NewCompactBitArray(1)
bA3.SetIndex(0, true)
bA4 := NewCompactBitArray(5)
bA4.SetIndex(0, true)
bA4.SetIndex(1, true)
bA5 := NewCompactBitArray(9)
bA5.SetIndex(0, true)
bA5.SetIndex(1, true)
bA5.SetIndex(8, true)
bA6 := NewCompactBitArray(16)
bA6.SetIndex(0, true)
bA6.SetIndex(1, true)
bA6.SetIndex(8, false)
bA6.SetIndex(15, true)
testCases := []struct {
bA *CompactBitArray
marshalledBA []byte
}{
{nil, []byte("null")},
{bA1, []byte("null")},
{bA2, []byte{byte(1), byte(0)}},
{bA3, []byte{byte(1), byte(128)}},
{bA4, []byte{byte(5), byte(192)}},
{bA5, []byte{byte(9), byte(192), byte(128)}},
{bA6, []byte{byte(16), byte(192), byte(1)}},
}
for _, tc := range testCases {
tc := tc
t.Run(tc.bA.String(), func(t *testing.T) {
bz := tc.bA.CompactMarshal()
assert.Equal(t, tc.marshalledBA, bz)
unmarshalledBA, err := CompactUnmarshal(bz)
require.NoError(t, err)
if tc.bA == nil {
require.Nil(t, unmarshalledBA)
} else {
require.NotNil(t, unmarshalledBA)
assert.EqualValues(t, tc.bA.Elems, unmarshalledBA.Elems)
if assert.EqualValues(t, tc.bA.String(), unmarshalledBA.String()) {
assert.EqualValues(t, tc.bA.Elems, unmarshalledBA.Elems)
}
}
})
}
}
func TestCompactBitArrayNumOfTrueBitsBefore(t *testing.T) {
testCases := []struct {
marshalledBA string
bAIndex []int
trueValueIndex []int
}{
{`"_____"`, []int{0, 1, 2, 3, 4}, []int{0, 0, 0, 0, 0}},
{`"x"`, []int{0}, []int{0}},
{`"_x"`, []int{1}, []int{0}},
{`"x___xxxx"`, []int{0, 4, 5, 6, 7}, []int{0, 1, 2, 3, 4}},
{`"__x_xx_x__x_x___"`, []int{2, 4, 5, 7, 10, 12}, []int{0, 1, 2, 3, 4, 5}},
{`"______________xx"`, []int{14, 15}, []int{0, 1}},
}
for tcIndex, tc := range testCases {
tc := tc
tcIndex := tcIndex
t.Run(tc.marshalledBA, func(t *testing.T) {
var bA *CompactBitArray
err := json.Unmarshal([]byte(tc.marshalledBA), &bA)
require.NoError(t, err)
for i := 0; i < len(tc.bAIndex); i++ {
require.Equal(t, tc.trueValueIndex[i], bA.NumTrueBitsBefore(tc.bAIndex[i]), "tc %d, i %d", tcIndex, i)
}
})
}
}
func TestCompactBitArrayGetSetIndex(t *testing.T) {
r := rand.New(rand.NewSource(100))
numTests := 10
numBitsPerArr := 100
for i := 0; i < numTests; i++ {
bits := r.Intn(1000)
bA, _ := randCompactBitArray(bits)
for j := 0; j < numBitsPerArr; j++ {
copy := bA.Copy()
index := r.Intn(bits)
val := (r.Int63() % 2) == 0
bA.SetIndex(index, val)
require.Equal(t, val, bA.GetIndex(index), "bA.SetIndex(%d, %v) failed on bit array: %s", index, val, copy)
}
}
}