TDD-在R3中运行契约测试的断言错误

在Corda的契约测试(来自Git repo for:IOUIssueTests)中,mustIncludeIssueCommand()的测试需要异常,但不会抛出异常。

   public void mustIncludeIssueCommand() {
        IOUState iou = new IOUState(Currencies.POUNDS(1), ALICE.getParty(), BOB.getParty());

        ledger(ledgerServices, l -> {
            l.transaction(tx -> {
                tx.output(IOUContract.IOU_CONTRACT_ID, iou);
                tx.command(Arrays.asList(ALICE.getPublicKey(), BOB.getPublicKey()), new Commands.DummyCommand()); // Wrong type.
                return tx.failsWith("Contract verification failed");
            });
            l.transaction(tx -> {
                tx.output(IOUContract.IOU_CONTRACT_ID, iou);
                tx.command(Arrays.asList(ALICE.getPublicKey(), BOB.getPublicKey()), new IOUContract.Commands.Issue()); // Correct type.
                return tx.verifies();
            });
            return null;
        });
    }

失败的原因是

java.lang.AssertionError: Expected exception but didn't get one

    at net.corda.testing.dsl.Verifies$DefaultImpls.failsWith(LedgerDSLInterpreter.kt:66)
    at net.corda.testing.dsl.TransactionDSLInterpreter$DefaultImpls.failsWith(TransactionDSLInterpreter.kt)
    at net.corda.testing.dsl.TestTransactionDSLInterpreter.failsWith(TestDSL.kt:67)
    at net.corda.testing.dsl.TransactionDSL.failsWith(TransactionDSLInterpreter.kt)

我试着在解决方案回购中运行代码,但似乎也失败了。我有什么遗漏吗?