}

        try {
            dataIndexHelper.crawl("test-session-force-stop");
            assertTrue("Should exit quickly when force stopped", true);
        } catch (Exception e) {
            assertTrue("Force stop should handle exceptions quickly", true);
        }
    }

    @Test
    public void test_crawl_with_short_intervals() {
        try {

        }
        long duration = System.nanoTime() - startTime;

        // Should complete quickly (relaxed threshold for CI environments)
        // Note: Set-based O(1) lookup should be much faster than O(n) array iteration
        assertTrue("Set-based lookup should complete quickly (duration: " + duration / 1_000_000 + "ms)", duration < 1_000_000_000); // 1 second (relaxed from 100ms for CI)
    }

    /**

2. **Thoughtful, honest feedback.** We will consider every contribution on its merits, regardless of whether AI was used. We may not respond quickly—our review queue is long—but we will tell you clearly what works, what needs to change, and why.

        doc2.put("title", "Quick Start");
        doc2.put("url", "http://example.com/start");
        msg.addSource(new ChatSource(2, doc2));

        final String result = chatClient.testBuildAssistantHistoryContent(msg, "source_titles", 500, 500);
        assertEquals("Response text\n[Referenced documents: Installation Guide, Quick Start]", result);
    }

    @Test

        final List<LlmMessage> history = new ArrayList<>();
        history.add(LlmMessage.user("How to install Fess?"));
        history.add(LlmMessage.assistant("[Referenced documents: Installation Guide, Quick Start]"));
        history.add(LlmMessage.user("Tell me about Docker"));
        history.add(LlmMessage.assistant("[Referenced documents: Docker Setup, Container Guide]"));