path: root/core/asm/asm_test.go

// Copyright 2017 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package asm

import (
    "testing"

    "encoding/hex"
)

// Tests disassembling the instructions for valid evm code
func TestInstructionIteratorValid(t *testing.T) {
    cnt := 0
    script, _ := hex.DecodeString("61000000")

    it := NewInstructionIterator(script)
    for it.Next() {
        cnt++
    }

    if err := it.Error(); err != nil {
        t.Errorf("Expected 2, but encountered error %v instead.", err)
    }
    if cnt != 2 {
        t.Errorf("Expected 2, but got %v instead.", cnt)
    }
}

// Tests disassembling the instructions for invalid evm code
func TestInstructionIteratorInvalid(t *testing.T) {
    cnt := 0
    script, _ := hex.DecodeString("6100")

    it := NewInstructionIterator(script)
    for it.Next() {
        cnt++
    }

    if it.Error() == nil {
        t.Errorf("Expected an error, but got %v instead.", cnt)
    }
}

// Tests disassembling the instructions for empty evm code
func TestInstructionIteratorEmpty(t *testing.T) {
    cnt := 0
    script, _ := hex.DecodeString("")

    it := NewInstructionIterator(script)
    for it.Next() {
        cnt++
    }

    if err := it.Error(); err != nil {
        t.Errorf("Expected 0, but encountered error %v instead.", err)
    }
    if cnt != 0 {
        t.Errorf("Expected 0, but got %v instead.", cnt)
    }
}