func createBlankWalletTester(name string) (*walletTester, error) {
	testdir := build.TempDir(modules.WalletDir, name)
	g, err := gateway.New("localhost:0", false, filepath.Join(testdir, modules.GatewayDir))
	if err != nil {
		return nil, err
	}
	cs, err := consensus.New(g, false, filepath.Join(testdir, modules.ConsensusDir))
	if err != nil {
		return nil, err
	}
	tp, err := transactionpool.New(cs, g, filepath.Join(testdir, modules.TransactionPoolDir))
	if err != nil {
		return nil, err
	}
	w, err := New(cs, tp, filepath.Join(testdir, modules.WalletDir))
	if err != nil {
		return nil, err
	}
	m, err := miner.New(cs, tp, w, filepath.Join(testdir, modules.MinerDir))
	if err != nil {
		return nil, err
	}
	wt := &walletTester{
		gateway: g,
		cs:      cs,
		tpool:   tp,
		miner:   m,
		wallet:  w,
		persistDir: testdir,
	}
	return wt, nil
}
createBlankWalletTester creates a wallet tester that has not mined any
blocks or encrypted the wallet.
package wallet
import (
	"path/filepath"
	"testing"
	"time"
	"github.com/NebulousLabs/Sia/build"
	"github.com/NebulousLabs/Sia/crypto"
	"github.com/NebulousLabs/Sia/modules"
	"github.com/NebulousLabs/Sia/modules/consensus"
	"github.com/NebulousLabs/Sia/modules/gateway"
	"github.com/NebulousLabs/Sia/modules/miner"
	"github.com/NebulousLabs/Sia/modules/transactionpool"
	"github.com/NebulousLabs/Sia/types"
	"github.com/NebulousLabs/fastrand"
)
type walletTester struct {
	cs      modules.ConsensusSet
	gateway modules.Gateway
	tpool   modules.TransactionPool
	miner   modules.TestMiner
	wallet  *Wallet
	walletMasterKey crypto.TwofishKey
	persistDir string
}
func createWalletTester(name string, deps modules.Dependencies) (*walletTester, error) {
	testdir := build.TempDir(modules.WalletDir, name)
	g, err := gateway.New("localhost:0", false, filepath.Join(testdir, modules.GatewayDir))
	if err != nil {
		return nil, err
	}
	cs, err := consensus.New(g, false, filepath.Join(testdir, modules.ConsensusDir))
	if err != nil {
		return nil, err
	}
	tp, err := transactionpool.New(cs, g, filepath.Join(testdir, modules.TransactionPoolDir))
	if err != nil {
		return nil, err
	}
	w, err := NewCustomWallet(cs, tp, filepath.Join(testdir, modules.WalletDir), deps)
	if err != nil {
		return nil, err
	}
	var masterKey crypto.TwofishKey
	fastrand.Read(masterKey[:])
	_, err = w.Encrypt(masterKey)
	if err != nil {
		return nil, err
	}
	err = w.Unlock(masterKey)
	if err != nil {
		return nil, err
	}
	m, err := miner.New(cs, tp, w, filepath.Join(testdir, modules.WalletDir))
	if err != nil {
		return nil, err
	}
	wt := &walletTester{
		cs:      cs,
		gateway: g,
		tpool:   tp,
		miner:   m,
		wallet:  w,
		walletMasterKey: masterKey,
		persistDir: testdir,
	}
	for i := types.BlockHeight(0); i <= types.MaturityDelay; i++ {
		b, _ := wt.miner.FindBlock()
		err := wt.cs.AcceptBlock(b)
		if err != nil {
			return nil, err
		}
	}
	return wt, nil
}