List<ResourceExpectation> expectations = new ArrayList<>();
        for (ExpectedRequest call : expectedCalls) {
            expectations.add((ResourceExpectation) call);
        }
        addNonBlockingHandler(expectations);
    }

    private void addNonBlockingHandler(final Collection<? extends ResourceExpectation> expectations) {

    private final ExpectationState state = new ExpectationState();

    ExpectMaxNConcurrentRequests(Lock lock, int testId, Duration timeout, int maxConcurrent, WaitPrecondition previous, Collection<? extends ResourceExpectation> expectedRequests) {
        if (expectedRequests.size() < maxConcurrent) {
            throw new IllegalArgumentException("Too few requests specified.");
        }
        this.lock = lock;