@Test
    public void test_evaluate_concurrency() {
        queryRescorer = new QueryRescorer() {
            private int callCount = 0;

            @Override
            public synchronized RescorerBuilder<?> evaluate(Map<String, Object> params) {
                callCount++;
                if (callCount % 2 == 0) {
                    return createMockRescorerBuilder();
                }
                return null;

    @Test
    public void test_addShutdownListener_replace() {
        // Test replacing shutdown listener
        AtomicInteger callCount = new AtomicInteger(0);
        ShutdownListener listener1 = new ShutdownListener() {
            @Override
            public void onShutdown() {
                callCount.incrementAndGet();
            }
        };

        ShutdownListener listener2 = new ShutdownListener() {
            @Override

                        </h1>
                    </div>
                </div>
            </div>
        </div>
        <section class="content">
            <div class="callout callout-danger lead">
                <p>
                    <la:errors/>
                </p>
            </div>

        </section>
    </main>