}

    @Override
    public void tearDown() throws Exception {
        super.tearDown();
        // Clear static fields
        clearStaticFields();
    }

    private void clearStaticFields() throws Exception {
        Field runningField = Crawler.class.getDeclaredField("running");
        runningField.setAccessible(true);
        ((AtomicBoolean) runningField.get(null)).set(false);