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package vm
import (
"math/big"
"testing"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/params"
)
func TestByteOp(t *testing.T) {
var (
env = NewEVM(Context{}, nil, params.TestChainConfig, Config{EnableJit: false, ForceJit: false})
stack = newstack()
)
tests := []struct {
v string
th uint64
expected *big.Int
}{
{"ABCDEF0908070605040302010000000000000000000000000000000000000000", 0, big.NewInt(0xAB)},
{"ABCDEF0908070605040302010000000000000000000000000000000000000000", 1, big.NewInt(0xCD)},
{"00CDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff", 0, big.NewInt(0x00)},
{"00CDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff", 1, big.NewInt(0xCD)},
{"0000000000000000000000000000000000000000000000000000000000102030", 31, big.NewInt(0x30)},
{"0000000000000000000000000000000000000000000000000000000000102030", 30, big.NewInt(0x20)},
{"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 32, big.NewInt(0x0)},
{"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 0xFFFFFFFFFFFFFFFF, big.NewInt(0x0)},
}
pc := uint64(0)
for _, test := range tests {
val := new(big.Int).SetBytes(common.Hex2Bytes(test.v))
th := new(big.Int).SetUint64(test.th)
stack.push(val)
stack.push(th)
opByte(&pc, env, nil, nil, stack)
actual := stack.pop()
if actual.Cmp(test.expected) != 0 {
t.Fatalf("Expected [%v] %v:th byte to be %v, was %v.", test.v, test.th, test.expected, actual)
}
}
}
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