public static Wallet createBasic(Network network) {
        return new Wallet(network, KeyChainGroup.createBasic(network));
    }
@Test
    public void createBasic() {
        Wallet wallet = Wallet.createBasic(TESTNET);
        assertEquals(0, wallet.getKeyChainGroupSize());
        wallet.importKey(new ECKey());
        assertEquals(1, wallet.getKeyChainGroupSize());
    }