state/state_test.go


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package state

import (
    "testing"

    "github.com/ethereum/go-ethereum/ethdb"
    "github.com/ethereum/go-ethereum/ethutil"
    "github.com/ethereum/go-ethereum/trie"
)

var ZeroHash256 = make([]byte, 32)

func TestSnapshot(t *testing.T) {
    db, _ := ethdb.NewMemDatabase()
    ethutil.ReadConfig(".ethtest", "/tmp/ethtest", "")
    ethutil.Config.Db = db

    state := New(trie.New(db, ""))

    stateObject := state.GetOrNewStateObject([]byte("aa"))

    stateObject.SetStorage(ethutil.Big("0"), ethutil.NewValue(42))

    snapshot := state.Copy()

    stateObject = state.GetStateObject([]byte("aa"))
    stateObject.SetStorage(ethutil.Big("0"), ethutil.NewValue(43))

    state.Set(snapshot)

    stateObject = state.GetStateObject([]byte("aa"))
    res := stateObject.GetStorage(ethutil.Big("0"))
    if !res.Cmp(ethutil.NewValue(42)) {
        t.Error("Expected storage 0 to be 42", res)
    }
}