@Test(expected = InsufficientMoneyException.class)
public void dontSpendStubs() throws Exception {
// Form a pledge and then try to spend it with another pledge. Should reject.
WalletTestObjects objects = new WalletTestObjects(() -> new PledgingWallet(UnitTestParams.get()));
PledgingWallet wallet = (PledgingWallet) objects.wallet;
objects.sendAmounts(1_000_000);
Project project = new Project(makeProject(wallet, 3_000_000));
PledgingWallet.PendingPledge pledge = wallet.createPledge(project, 1_000_000, null);
pledge.commit(true);
// Check that pledges are serialized.
wallet = roundtripWallet(wallet);