state/state_test.go


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package state

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

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

type StateSuite struct {
    state *StateDB
}

var _ = checker.Suite(&StateSuite{})

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

func (s *StateSuite) TestDump(c *checker.C) {
    key := []byte{0x01}
    value := []byte("foo")
    s.state.trie.Update(key, value)
    dump := s.state.Dump()
    c.Assert(dump, checker.NotNil)
}

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

func (s *StateSuite) TestSnapshot(c *checker.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, checker.DeepEquals, res)
}