verify(urlQueueService, times(1)).offerAll(anyString(), any());
    }

    /**
     * Test storeChildUrl with depth exceeding maxDepth.
     */
    public void test_storeChildUrl_exceedsMaxDepth() throws Exception {
        when(urlFilter.match("http://example.com/child")).thenReturn(true);

        // Use reflection to access protected method
        final java.lang.reflect.Method method =