testMultipleParticipants.java

@Suspendable
    private String testOnlyTwoParticipants(MemberInfo myInfo, MemberInfo otherMember, NotaryInfo notary) {
        try {
            IOUState iouState = new IOUState(
                    10,
                    myInfo.getName(),
                    otherMember.getName(),
                    3,
                    UUID.randomUUID(),
                    Collections.singletonList(myInfo.getLedgerKeys().get(0))
            );

            var txBuilder = ledgerService.createTransactionBuilder()
                    .setNotary(notary.getName())
                    .setTimeWindowBetween(Instant.now(), Instant.now().plusMillis(Duration.ofDays(1).toMillis()))
                    .addOutputState(iouState)
                    .addCommand(new IOUContract.Issue())
                    .addSignatories(iouState.getParticipants());

            var signedTransaction = txBuilder.toSignedTransaction();

            return "Fail";

        } catch (Exception e) {
            String exceptionMessage = e.getMessage() != null ? e.getMessage() : "No exception message";
            if (exceptionMessage.contains("only two participants")) {
                return "Pass";
            } else {
                return "Contract failed but with a different Exception: " + e.getMessage();
            }
        }
    }