State snapshotting

ethchain/state_test.go

@@ -0,0 +1,31 @@
+package ethchain
+
+import (
+	"fmt"
+	"github.com/ethereum/eth-go/ethdb"
+	"github.com/ethereum/eth-go/ethutil"
+	"testing"
+)
+
+func TestSnapshot(t *testing.T) {
+	ethutil.ReadConfig("", ethutil.LogStd, "")
+
+	db, _ := ethdb.NewMemDatabase()
+	state := NewState(ethutil.NewTrie(db, ""))
+
+	stateObject := NewContract([]byte("aa"), ethutil.Big1, ZeroHash256)
+	state.UpdateStateObject(stateObject)
+	stateObject.SetStorage(ethutil.Big("0"), ethutil.NewValue(42))
+
+	snapshot := state.Snapshot()
+
+	stateObject = state.GetStateObject([]byte("aa"))
+	stateObject.SetStorage(ethutil.Big("0"), ethutil.NewValue(43))
+
+	state.Revert(snapshot)
+
+	stateObject = state.GetStateObject([]byte("aa"))
+	if !stateObject.GetStorage(ethutil.Big("0")).Cmp(ethutil.NewValue(42)) {
+		t.Error("Expected storage 0 to be 42")
+	}
+}