state/state_test.go


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package state

import (
    . "gopkg.in/check.v1"
    "testing"

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

func Test(t *testing.T) { TestingT(t) }

type StateSuite struct {
    state *State
}

var _ = Suite(&StateSuite{})

const expectedasbytes = "Expected % x Got % x"

// var ZeroHash256 = make([]byte, 32)

func (s *StateSuite) SetUpTest(c *C) {
    db, _ := ethdb.NewMemDatabase()
    ethutil.ReadConfig(".ethtest", "/tmp/ethtest", "")
    ethutil.Config.Db = db
    s.state = New(trie.New(db, ""))
}

func (s *StateSuite) TestSnapshot(c *C) {
    stateobjaddr := []byte("aa")
    storageaddr := ethutil.Big("0")
    data1 := ethutil.NewValue(42)
    data2 := ethutil.NewValue(43)

    // get state object
    stateObject := s.state.GetOrNewStateObject(stateobjaddr)
    // set inital state object value
    stateObject.SetStorage(storageaddr, data1)
    // get snapshot of current state
    snapshot := s.state.Copy()

    // get state object. is this strictly necessary?
    stateObject = s.state.GetStateObject(stateobjaddr)
    // set new state object value
    stateObject.SetStorage(storageaddr, data2)
    // restore snapshot
    s.state.Set(snapshot)

    // get state object
    stateObject = s.state.GetStateObject(stateobjaddr)
    // get state storage value
    res := stateObject.GetStorage(storageaddr)

    c.Assert(data1, DeepEquals, res, Commentf(expectedasbytes, data1, res))
}