static long toMillis(double seconds) {
        return (long) (seconds * 1000)
    }

    void setShortTimeout(int millis) {
        this.timeout = millis
    }

    ExecutorFactory getExecutorFactory() {
        return new ExecutorFactory() {
            @Override
            ManagedExecutor create(String displayName) {
                return new ManagedExecutorStub(ConcurrentTestUtil.this)
            }

            executor = new ExecutorImpl();
        }
        return executor;
    }

    /**
     * Creates an ExecutorFactory for the test to use.
     */
    protected ExecutorFactory getExecutorFactory() {
        return new DefaultExecutorFactory() {
            @Override
            protected ExecutorService createExecutor(String displayName) {
                return new ExecutorImpl();
            }
        };