then:
        1 * clientsManager.reserveIdleClient(options) >> client
        1 * buildOperationRunner.call(_)
    }

    def "build worker operation is finished even if worker fails"() {
        when:
        factory.getWorker(requirement).execute(spec)

        then:
        1 * clientsManager.reserveIdleClient(options) >> client

    }

    // TODO - should supply and check for the same parameters as passed to reserveNewClient()
    public WorkerDaemonClient reserveIdleClient(DaemonForkOptions forkOptions) {
        return reserveIdleClient(forkOptions, idleClients);
    }

    WorkerDaemonClient reserveIdleClient(DaemonForkOptions forkOptions, List<WorkerDaemonClient> clients) {
        synchronized (lock) {

            private WorkerDaemonClient reserveClient() {
                DaemonForkOptions forkOptions = ((ForkedWorkerRequirement) workerRequirement).getForkOptions();
                WorkerDaemonClient client = clientsManager.reserveIdleClient(forkOptions);
                if (client == null) {
                    client = clientsManager.reserveNewClient(forkOptions);
                }
                return client;
            }
        };
    }