plugeth/state/state_test.go

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package state
import (
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"testing"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/ethutil"
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"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
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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)
}
}