mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-12-23 03:41:34 +00:00
610 lines
19 KiB
Go
610 lines
19 KiB
Go
package native
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import (
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"encoding/base64"
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"encoding/hex"
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"math"
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"math/big"
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"strings"
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"testing"
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"github.com/mr-tron/base58"
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"github.com/nspcc-dev/neo-go/pkg/core/dao"
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"github.com/nspcc-dev/neo-go/pkg/core/interop"
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base58neogo "github.com/nspcc-dev/neo-go/pkg/encoding/base58"
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"github.com/nspcc-dev/neo-go/pkg/vm"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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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 TestStdLibItoaAtoi(t *testing.T) {
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s := newStd()
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ic := &interop.Context{VM: vm.New(), DAO: &dao.Simple{}}
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var actual stackitem.Item
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t.Run("itoa-atoi", func(t *testing.T) {
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var testCases = []struct {
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num *big.Int
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base *big.Int
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result string
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}{
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{big.NewInt(0), big.NewInt(10), "0"},
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{big.NewInt(0), big.NewInt(16), "0"},
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{big.NewInt(1), big.NewInt(10), "1"},
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{big.NewInt(-1), big.NewInt(10), "-1"},
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{big.NewInt(1), big.NewInt(16), "1"},
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{big.NewInt(7), big.NewInt(16), "7"},
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{big.NewInt(8), big.NewInt(16), "08"},
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{big.NewInt(65535), big.NewInt(16), "0ffff"},
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{big.NewInt(15), big.NewInt(16), "0f"},
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{big.NewInt(-1), big.NewInt(16), "f"},
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}
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for _, tc := range testCases {
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require.NotPanics(t, func() {
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actual = s.itoa(ic, []stackitem.Item{stackitem.Make(tc.num), stackitem.Make(tc.base)})
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})
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require.Equal(t, stackitem.Make(tc.result), actual)
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require.NotPanics(t, func() {
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actual = s.atoi(ic, []stackitem.Item{stackitem.Make(tc.result), stackitem.Make(tc.base)})
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})
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require.Equal(t, stackitem.Make(tc.num), actual)
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if tc.base.Int64() == 10 {
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require.NotPanics(t, func() {
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actual = s.itoa10(ic, []stackitem.Item{stackitem.Make(tc.num)})
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})
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require.Equal(t, stackitem.Make(tc.result), actual)
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require.NotPanics(t, func() {
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actual = s.atoi10(ic, []stackitem.Item{stackitem.Make(tc.result)})
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})
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require.Equal(t, stackitem.Make(tc.num), actual)
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if tc.result[0] != '-' {
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require.NotPanics(t, func() {
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actual = s.atoi10(ic, []stackitem.Item{stackitem.Make("+" + tc.result)})
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})
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require.Equal(t, stackitem.Make(tc.num), actual)
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}
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}
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}
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t.Run("-1", func(t *testing.T) {
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for _, str := range []string{"FF", "FFF", "FFFF"} {
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require.NotPanics(t, func() {
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actual = s.atoi(ic, []stackitem.Item{stackitem.Make(str), stackitem.Make(16)})
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})
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require.Equal(t, stackitem.Make(-1), actual)
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}
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})
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})
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t.Run("itoa error", func(t *testing.T) {
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var testCases = []struct {
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num *big.Int
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base *big.Int
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err error
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}{
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{big.NewInt(1), big.NewInt(13), ErrInvalidBase},
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{big.NewInt(-1), new(big.Int).Add(big.NewInt(math.MaxInt64), big.NewInt(10)), ErrInvalidBase},
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}
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for _, tc := range testCases {
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require.PanicsWithError(t, tc.err.Error(), func() {
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_ = s.itoa(ic, []stackitem.Item{stackitem.Make(tc.num), stackitem.Make(tc.base)})
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})
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}
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})
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t.Run("atoi error", func(t *testing.T) {
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var testCases = []struct {
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num string
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base *big.Int
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err error
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}{
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{"1", big.NewInt(13), ErrInvalidBase},
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{"1", new(big.Int).Add(big.NewInt(math.MaxInt64), big.NewInt(16)), ErrInvalidBase},
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{"1_000", big.NewInt(10), ErrInvalidFormat},
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{" 1", big.NewInt(10), ErrInvalidFormat},
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{"1 ", big.NewInt(10), ErrInvalidFormat},
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{"FE", big.NewInt(10), ErrInvalidFormat},
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{"XD", big.NewInt(16), ErrInvalidFormat},
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{strings.Repeat("0", stdMaxInputLength+1), big.NewInt(10), ErrTooBigInput},
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}
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for _, tc := range testCases {
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require.PanicsWithError(t, tc.err.Error(), func() {
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_ = s.atoi(ic, []stackitem.Item{stackitem.Make(tc.num), stackitem.Make(tc.base)})
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})
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}
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})
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}
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func TestStdLibJSON(t *testing.T) {
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s := newStd()
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ic := &interop.Context{VM: vm.New()}
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var actual stackitem.Item
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t.Run("JSONSerialize", func(t *testing.T) {
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t.Run("Good", func(t *testing.T) {
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require.NotPanics(t, func() {
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actual = s.jsonSerialize(ic, []stackitem.Item{stackitem.Make(42)})
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})
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require.Equal(t, stackitem.Make([]byte("42")), actual)
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})
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t.Run("Bad", func(t *testing.T) {
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arr := stackitem.NewArray([]stackitem.Item{
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stackitem.NewByteArray(make([]byte, stackitem.MaxSize/2)),
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stackitem.NewByteArray(make([]byte, stackitem.MaxSize/2)),
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})
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require.Panics(t, func() {
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_ = s.jsonSerialize(ic, []stackitem.Item{arr})
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})
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})
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})
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t.Run("JSONDeserialize", func(t *testing.T) {
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t.Run("Good", func(t *testing.T) {
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require.NotPanics(t, func() {
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actual = s.jsonDeserialize(ic, []stackitem.Item{stackitem.Make("42")})
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})
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require.Equal(t, stackitem.Make(42), actual)
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})
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t.Run("Bad", func(t *testing.T) {
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require.Panics(t, func() {
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_ = s.jsonDeserialize(ic, []stackitem.Item{stackitem.Make("{]")})
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})
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require.Panics(t, func() {
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_ = s.jsonDeserialize(ic, []stackitem.Item{stackitem.NewInterop(nil)})
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})
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})
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})
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}
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func TestStdLibEncodeDecode(t *testing.T) {
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s := newStd()
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original := []byte("my pretty string")
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originalUrl := []byte("Subject=test@example.com&Issuer=https://example.com")
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encoded64 := base64.StdEncoding.EncodeToString(original)
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encoded64Url := "U3ViamVjdD10ZXN0QGV4YW1wbGUuY29tJklzc3Vlcj1odHRwczovL2V4YW1wbGUuY29t"
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encoded58 := base58.Encode(original)
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encoded58Check := base58neogo.CheckEncode(original)
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ic := &interop.Context{VM: vm.New()}
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var actual stackitem.Item
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bigInputArgs := []stackitem.Item{stackitem.Make(strings.Repeat("6", stdMaxInputLength+1))}
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t.Run("Encode64", func(t *testing.T) {
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require.NotPanics(t, func() {
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actual = s.base64Encode(ic, []stackitem.Item{stackitem.Make(original)})
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})
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require.Equal(t, stackitem.Make(encoded64), actual)
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})
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t.Run("Encode64/error", func(t *testing.T) {
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require.PanicsWithError(t, ErrTooBigInput.Error(),
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func() { s.base64Encode(ic, bigInputArgs) })
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})
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t.Run("Encode64Url", func(t *testing.T) {
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require.NotPanics(t, func() {
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actual = s.base64UrlEncode(ic, []stackitem.Item{stackitem.Make(originalUrl)})
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})
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require.Equal(t, stackitem.Make(encoded64Url), actual)
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})
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t.Run("Encode64Url/error", func(t *testing.T) {
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require.PanicsWithError(t, ErrTooBigInput.Error(),
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func() { s.base64UrlEncode(ic, bigInputArgs) })
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})
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t.Run("Encode58", func(t *testing.T) {
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require.NotPanics(t, func() {
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actual = s.base58Encode(ic, []stackitem.Item{stackitem.Make(original)})
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})
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require.Equal(t, stackitem.Make(encoded58), actual)
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})
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t.Run("Encode58/error", func(t *testing.T) {
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require.PanicsWithError(t, ErrTooBigInput.Error(),
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func() { s.base58Encode(ic, bigInputArgs) })
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})
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t.Run("CheckEncode58", func(t *testing.T) {
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require.NotPanics(t, func() {
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actual = s.base58CheckEncode(ic, []stackitem.Item{stackitem.Make(original)})
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})
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require.Equal(t, stackitem.Make(encoded58Check), actual)
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})
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t.Run("CheckEncode58/error", func(t *testing.T) {
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require.PanicsWithError(t, ErrTooBigInput.Error(),
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func() { s.base58CheckEncode(ic, bigInputArgs) })
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})
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t.Run("Decode64/positive", func(t *testing.T) {
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require.NotPanics(t, func() {
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actual = s.base64Decode(ic, []stackitem.Item{stackitem.Make(encoded64)})
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})
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require.Equal(t, stackitem.Make(original), actual)
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})
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t.Run("Decode64/error", func(t *testing.T) {
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require.Panics(t, func() {
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_ = s.base64Decode(ic, []stackitem.Item{stackitem.Make(encoded64 + "%")})
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})
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require.Panics(t, func() {
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_ = s.base64Decode(ic, []stackitem.Item{stackitem.NewInterop(nil)})
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})
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require.PanicsWithError(t, ErrTooBigInput.Error(),
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func() { s.base64Decode(ic, bigInputArgs) })
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})
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t.Run("Decode64Url/positive", func(t *testing.T) {
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require.NotPanics(t, func() {
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actual = s.base64UrlDecode(ic, []stackitem.Item{stackitem.Make(encoded64Url)})
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})
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require.Equal(t, stackitem.Make(originalUrl), actual)
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})
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t.Run("Decode64Url/error", func(t *testing.T) {
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require.Panics(t, func() {
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_ = s.base64UrlDecode(ic, []stackitem.Item{stackitem.Make(encoded64Url + "%")})
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})
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require.Panics(t, func() {
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_ = s.base64UrlDecode(ic, []stackitem.Item{stackitem.NewInterop(nil)})
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})
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require.PanicsWithError(t, ErrTooBigInput.Error(),
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func() { s.base64UrlDecode(ic, bigInputArgs) })
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})
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t.Run("Decode58/positive", func(t *testing.T) {
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require.NotPanics(t, func() {
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actual = s.base58Decode(ic, []stackitem.Item{stackitem.Make(encoded58)})
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})
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require.Equal(t, stackitem.Make(original), actual)
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})
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t.Run("Decode58/error", func(t *testing.T) {
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require.Panics(t, func() {
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_ = s.base58Decode(ic, []stackitem.Item{stackitem.Make(encoded58 + "%")})
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})
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require.Panics(t, func() {
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_ = s.base58Decode(ic, []stackitem.Item{stackitem.NewInterop(nil)})
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})
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require.PanicsWithError(t, ErrTooBigInput.Error(),
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func() { s.base58Decode(ic, bigInputArgs) })
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})
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t.Run("CheckDecode58/positive", func(t *testing.T) {
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require.NotPanics(t, func() {
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actual = s.base58CheckDecode(ic, []stackitem.Item{stackitem.Make(encoded58Check)})
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})
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require.Equal(t, stackitem.Make(original), actual)
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})
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t.Run("CheckDecode58/error", func(t *testing.T) {
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require.Panics(t, func() {
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_ = s.base58CheckDecode(ic, []stackitem.Item{stackitem.Make(encoded58 + "%")})
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})
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require.Panics(t, func() {
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_ = s.base58CheckDecode(ic, []stackitem.Item{stackitem.NewInterop(nil)})
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})
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require.PanicsWithError(t, ErrTooBigInput.Error(),
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func() { s.base58CheckDecode(ic, bigInputArgs) })
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})
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}
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func TestStdLibSerialize(t *testing.T) {
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s := newStd()
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ic := &interop.Context{VM: vm.New(), DAO: &dao.Simple{}}
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t.Run("recursive", func(t *testing.T) {
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arr := stackitem.NewArray(nil)
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arr.Append(arr)
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require.Panics(t, func() {
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_ = s.serialize(ic, []stackitem.Item{arr})
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})
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})
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t.Run("big item", func(t *testing.T) {
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require.Panics(t, func() {
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_ = s.serialize(ic, []stackitem.Item{stackitem.NewByteArray(make([]byte, stackitem.MaxSize))})
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})
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})
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t.Run("good", func(t *testing.T) {
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var (
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actualSerialized stackitem.Item
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actualDeserialized stackitem.Item
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)
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require.NotPanics(t, func() {
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actualSerialized = s.serialize(ic, []stackitem.Item{stackitem.Make(42)})
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})
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encoded, err := stackitem.Serialize(stackitem.Make(42))
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require.NoError(t, err)
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require.Equal(t, stackitem.Make(encoded), actualSerialized)
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require.NotPanics(t, func() {
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actualDeserialized = s.deserialize(ic, []stackitem.Item{actualSerialized})
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})
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require.Equal(t, stackitem.Make(42), actualDeserialized)
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t.Run("bad", func(t *testing.T) {
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encoded[0] ^= 0xFF
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require.Panics(t, func() {
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_ = s.deserialize(ic, []stackitem.Item{stackitem.Make(encoded)})
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})
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})
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})
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}
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func TestStdLibSerializeDeserialize(t *testing.T) {
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s := newStd()
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ic := &interop.Context{VM: vm.New(), DAO: &dao.Simple{}}
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var actual stackitem.Item
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checkSerializeDeserialize := func(t *testing.T, value any, expected stackitem.Item) {
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require.NotPanics(t, func() {
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actual = s.serialize(ic, []stackitem.Item{stackitem.Make(value)})
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})
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require.NotPanics(t, func() {
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actual = s.deserialize(ic, []stackitem.Item{actual})
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})
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require.Equal(t, expected, actual)
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}
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t.Run("Bool", func(t *testing.T) {
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checkSerializeDeserialize(t, true, stackitem.NewBool(true))
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})
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t.Run("ByteArray", func(t *testing.T) {
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checkSerializeDeserialize(t, []byte{1, 2, 3}, stackitem.NewByteArray([]byte{1, 2, 3}))
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})
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t.Run("Integer", func(t *testing.T) {
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checkSerializeDeserialize(t, 48, stackitem.NewBigInteger(big.NewInt(48)))
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})
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t.Run("Array", func(t *testing.T) {
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arr := stackitem.NewArray([]stackitem.Item{
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stackitem.Make(true),
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stackitem.Make(123),
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stackitem.NewMap()})
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checkSerializeDeserialize(t, arr, arr)
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})
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t.Run("Struct", func(t *testing.T) {
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st := stackitem.NewStruct([]stackitem.Item{
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stackitem.Make(true),
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stackitem.Make(123),
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stackitem.NewMap(),
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})
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checkSerializeDeserialize(t, st, st)
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})
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t.Run("Map", func(t *testing.T) {
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item := stackitem.NewMap()
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item.Add(stackitem.Make(true), stackitem.Make([]byte{1, 2, 3}))
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item.Add(stackitem.Make([]byte{0}), stackitem.Make(false))
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checkSerializeDeserialize(t, item, item)
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})
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t.Run("Serialize MapCompat", func(t *testing.T) {
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resHex := "480128036b6579280576616c7565"
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res, err := hex.DecodeString(resHex)
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require.NoError(t, err)
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item := stackitem.NewMap()
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item.Add(stackitem.Make([]byte("key")), stackitem.Make([]byte("value")))
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require.NotPanics(t, func() {
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actual = s.serialize(ic, []stackitem.Item{stackitem.Make(item)})
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})
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bytes, err := actual.TryBytes()
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require.NoError(t, err)
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assert.Equal(t, res, bytes)
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})
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t.Run("Serialize Interop", func(t *testing.T) {
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require.Panics(t, func() {
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actual = s.serialize(ic, []stackitem.Item{stackitem.NewInterop("kek")})
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})
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})
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t.Run("Serialize Array bad", func(t *testing.T) {
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item := stackitem.NewArray([]stackitem.Item{stackitem.NewBool(true), stackitem.NewBool(true)})
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item.Value().([]stackitem.Item)[1] = item
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require.Panics(t, func() {
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actual = s.serialize(ic, []stackitem.Item{item})
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})
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})
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t.Run("Deserialize unknown", func(t *testing.T) {
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data, err := stackitem.Serialize(stackitem.NewBigInteger(big.NewInt(123)))
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require.NoError(t, err)
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data[0] = 0xFF
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require.Panics(t, func() {
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actual = s.deserialize(ic, []stackitem.Item{stackitem.Make(data)})
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})
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})
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t.Run("Deserialize not a byte array", func(t *testing.T) {
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require.Panics(t, func() {
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actual = s.deserialize(ic, []stackitem.Item{stackitem.NewInterop(nil)})
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})
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})
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}
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func TestMemoryCompare(t *testing.T) {
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s := newStd()
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ic := &interop.Context{VM: vm.New(), DAO: &dao.Simple{}}
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check := func(t *testing.T, result int64, s1, s2 string) {
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actual := s.memoryCompare(ic, []stackitem.Item{stackitem.Make(s1), stackitem.Make(s2)})
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require.Equal(t, big.NewInt(result), actual.Value())
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}
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check(t, -1, "a", "ab")
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check(t, 1, "ab", "a")
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check(t, 0, "ab", "ab")
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check(t, -1, "", "a")
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check(t, 0, "", "")
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t.Run("C# compatibility", func(t *testing.T) {
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// These tests are taken from C# node.
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check(t, -1, "abc", "c")
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check(t, -1, "abc", "d")
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check(t, 0, "abc", "abc")
|
|
check(t, -1, "abc", "abcd")
|
|
})
|
|
|
|
t.Run("big arguments", func(t *testing.T) {
|
|
s1 := stackitem.Make(strings.Repeat("x", stdMaxInputLength+1))
|
|
s2 := stackitem.Make("xxx")
|
|
|
|
require.PanicsWithError(t, ErrTooBigInput.Error(),
|
|
func() { s.memoryCompare(ic, []stackitem.Item{s1, s2}) })
|
|
|
|
require.PanicsWithError(t, ErrTooBigInput.Error(),
|
|
func() { s.memoryCompare(ic, []stackitem.Item{s2, s1}) })
|
|
})
|
|
}
|
|
|
|
func TestMemorySearch(t *testing.T) {
|
|
s := newStd()
|
|
ic := &interop.Context{VM: vm.New()}
|
|
|
|
check := func(t *testing.T, result int64, args ...any) {
|
|
items := make([]stackitem.Item, len(args))
|
|
for i := range args {
|
|
items[i] = stackitem.Make(args[i])
|
|
}
|
|
|
|
var actual stackitem.Item
|
|
switch len(items) {
|
|
case 2:
|
|
actual = s.memorySearch2(ic, items)
|
|
case 3:
|
|
actual = s.memorySearch3(ic, items)
|
|
case 4:
|
|
actual = s.memorySearch4(ic, items)
|
|
default:
|
|
panic("invalid args length")
|
|
}
|
|
require.Equal(t, big.NewInt(result), actual.Value())
|
|
}
|
|
|
|
t.Run("C# compatibility", func(t *testing.T) {
|
|
// These tests are taken from C# node.
|
|
check(t, 2, "abc", "c", 0)
|
|
check(t, 2, "abc", "c", 1)
|
|
check(t, 2, "abc", "c", 2)
|
|
check(t, -1, "abc", "c", 3)
|
|
check(t, -1, "abc", "d", 0)
|
|
|
|
check(t, 2, "abc", "c", 0, false)
|
|
check(t, 2, "abc", "c", 1, false)
|
|
check(t, 2, "abc", "c", 2, false)
|
|
check(t, -1, "abc", "c", 3, false)
|
|
check(t, -1, "abc", "d", 0, false)
|
|
|
|
check(t, -1, "abc", "c", 0, true)
|
|
check(t, -1, "abc", "c", 1, true)
|
|
check(t, -1, "abc", "c", 2, true)
|
|
check(t, 2, "abc", "c", 3, true)
|
|
check(t, -1, "abc", "d", 0, true)
|
|
})
|
|
|
|
t.Run("boundary indices", func(t *testing.T) {
|
|
arg := stackitem.Make("aaa")
|
|
require.Panics(t, func() {
|
|
s.memorySearch3(ic, []stackitem.Item{arg, arg, stackitem.Make(-1)})
|
|
})
|
|
require.Panics(t, func() {
|
|
s.memorySearch3(ic, []stackitem.Item{arg, arg, stackitem.Make(4)})
|
|
})
|
|
t.Run("still in capacity", func(t *testing.T) {
|
|
require.Panics(t, func() {
|
|
arr := stackitem.NewByteArray(make([]byte, 5, 10))
|
|
s.memorySearch3(ic, []stackitem.Item{arr, arg, stackitem.Make(7)})
|
|
})
|
|
require.Panics(t, func() {
|
|
arr := stackitem.NewByteArray(make([]byte, 5, 10))
|
|
s.memorySearch4(ic, []stackitem.Item{arr, arg,
|
|
stackitem.Make(7), stackitem.Make(true)})
|
|
})
|
|
})
|
|
})
|
|
|
|
t.Run("big arguments", func(t *testing.T) {
|
|
s1 := stackitem.Make(strings.Repeat("x", stdMaxInputLength+1))
|
|
s2 := stackitem.Make("xxx")
|
|
start := stackitem.Make(1)
|
|
b := stackitem.Make(true)
|
|
|
|
require.PanicsWithError(t, ErrTooBigInput.Error(),
|
|
func() { s.memorySearch2(ic, []stackitem.Item{s1, s2}) })
|
|
|
|
require.PanicsWithError(t, ErrTooBigInput.Error(),
|
|
func() { s.memorySearch2(ic, []stackitem.Item{s2, s1}) })
|
|
|
|
require.PanicsWithError(t, ErrTooBigInput.Error(),
|
|
func() { s.memorySearch3(ic, []stackitem.Item{s1, s2, start}) })
|
|
|
|
require.PanicsWithError(t, ErrTooBigInput.Error(),
|
|
func() { s.memorySearch3(ic, []stackitem.Item{s2, s1, start}) })
|
|
|
|
require.PanicsWithError(t, ErrTooBigInput.Error(),
|
|
func() { s.memorySearch4(ic, []stackitem.Item{s1, s2, start, b}) })
|
|
|
|
require.PanicsWithError(t, ErrTooBigInput.Error(),
|
|
func() { s.memorySearch4(ic, []stackitem.Item{s2, s1, start, b}) })
|
|
})
|
|
}
|
|
|
|
func TestStringSplit(t *testing.T) {
|
|
s := newStd()
|
|
ic := &interop.Context{VM: vm.New()}
|
|
|
|
check := func(t *testing.T, result []string, str, sep string, remove any) {
|
|
args := []stackitem.Item{stackitem.Make(str), stackitem.Make(sep)}
|
|
var actual stackitem.Item
|
|
if remove == nil {
|
|
actual = s.stringSplit2(ic, args)
|
|
} else {
|
|
args = append(args, stackitem.NewBool(remove.(bool)))
|
|
actual = s.stringSplit3(ic, args)
|
|
}
|
|
|
|
arr, ok := actual.Value().([]stackitem.Item)
|
|
require.True(t, ok)
|
|
require.Equal(t, len(result), len(arr))
|
|
for i := range result {
|
|
require.Equal(t, stackitem.Make(result[i]), arr[i])
|
|
}
|
|
}
|
|
|
|
check(t, []string{"a", "b", "c"}, "abc", "", nil)
|
|
check(t, []string{"a", "b", "c"}, "abc", "", true)
|
|
check(t, []string{"a", "c", "", "", "d"}, "abcbbbd", "b", nil)
|
|
check(t, []string{"a", "c", "", "", "d"}, "abcbbbd", "b", false)
|
|
check(t, []string{"a", "c", "d"}, "abcbbbd", "b", true)
|
|
check(t, []string{""}, "", "abc", nil)
|
|
check(t, []string{}, "", "abc", true)
|
|
|
|
t.Run("C# compatibility", func(t *testing.T) {
|
|
// These tests are taken from C# node.
|
|
check(t, []string{"a", "b"}, "a,b", ",", nil)
|
|
})
|
|
|
|
t.Run("big arguments", func(t *testing.T) {
|
|
s1 := stackitem.Make(strings.Repeat("x", stdMaxInputLength+1))
|
|
s2 := stackitem.Make("xxx")
|
|
|
|
require.PanicsWithError(t, ErrTooBigInput.Error(),
|
|
func() { s.stringSplit2(ic, []stackitem.Item{s1, s2}) })
|
|
})
|
|
}
|
|
|
|
func TestStd_StrLen(t *testing.T) {
|
|
s := newStd()
|
|
ic := &interop.Context{VM: vm.New()}
|
|
|
|
check := func(t *testing.T, expected int64, str string) {
|
|
args := []stackitem.Item{stackitem.Make(str)}
|
|
actual := s.strLen(ic, args)
|
|
l, ok := actual.Value().(*big.Int)
|
|
require.True(t, ok)
|
|
require.Equal(t, expected, l.Int64())
|
|
}
|
|
|
|
// These tests are taken from https://github.com/neo-project/neo/pull/2854/files.
|
|
check(t, 1, "🦆")
|
|
check(t, 1, "ã")
|
|
check(t, 1, "a")
|
|
|
|
bad := string(rune(0xff))
|
|
check(t, 1, bad)
|
|
check(t, 3, bad+"ab")
|
|
}
|