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