urlSet.add("http://example" + i + ".com/robots.txt");
        }
        assertEquals(10000, urlSet.size());

        // Add one more should maintain size at 10000 (LRU eviction)
        urlSet.add("http://overflow.com/robots.txt");
        assertEquals(10000, urlSet.size());
        assertTrue(urlSet.contains("http://overflow.com/robots.txt"));