{* ../../docs_src/stream_data/tutorial002_py310.py ln[6,19:20] hl[20] *}

接著在路徑操作函式中用 `response_class=PNGStreamingResponse` 使用這個新類別：

{* ../../docs_src/stream_data/tutorial002_py310.py ln[23:27] hl[23] *}

### 模擬檔案 { #simulate-a-file }

此範例中我們用 `io.BytesIO` 模擬檔案。它是只存在於記憶體中的類檔案物件，但提供相同的介面。

例如，我們可以像讀取一般檔案一樣，透過迭代來消耗其內容。

{* ../../docs_src/stream_data/tutorial002_py310.py ln[1:27] hl[3,12:13,25] *}

/// note | 技術細節

        void urlParameterParsing() {
            String expectedUrl = "smb://server/share/test.txt";
            TestLocking t = new TestLocking();

            // Simulate argument parsing
            String[] args = { "-t", "2", "-i", "5", "-d", "100", expectedUrl };
            for (int ai = 0; ai < args.length; ai++) {
                if (args[ai].equals("-t")) {
                    ai++;

        // Test getInfo with compatible class
        response = new Trans2QueryFSInformationResponse(config, FileSystemInformation.SMB_INFO_ALLOCATION);

        // Simulate setting info using reflection
        SmbInfoAllocation allocation = new SmbInfoAllocation();
        setInfoField(response, allocation);

        SmbInfoAllocation result = response.getInfo(SmbInfoAllocation.class);

}

// Test canceling context while quorum servers report lock not found
func TestFailedRefreshLock(t *testing.T) {
	if testing.Short() {
		t.Skip("skipping test in short mode.")
	}

	// Simulate Refresh response to return no locking found
	for i := range lockServers[:3] {
		lockServers[i].setRefreshReply(false)
		defer lockServers[i].setRefreshReply(true)
	}

	dm := NewDRWMutex(ds, "aap")

        when(httpSession.getAttribute("NtlmHttpAuth")).thenReturn(null);
        when(httpSession.getAttribute("NtlmHttpChal")).thenReturn(null);

        // For this test, we'll simulate that no auth header means we should challenge
        // Since we can't mock the internal transport operations easily without real network,
        // we'll test the simpler case where no NTLM negotiation is needed

        // This simulates what happens when the condition is loaded from fess_thumbnail.xml
        generator = new TestThumbnailGenerator();

        // The pattern as it would be loaded from XML: "image/svg\+xml"
        // In XML, a single backslash is passed directly (no Java string escaping)
        // So we use a literal backslash here to simulate XML-loaded value

            private long totalTime = 0;

            @Override
            public void store(DataStoreParams paramMap, Map<String, Object> dataMap) {
                try {
                    Thread.sleep(10); // Simulate processing time
                } catch (InterruptedException e) {
                    // Ignore
                }
                totalTime = System.currentTimeMillis() - startTime;
            }

        @Override
        public Object evaluate(String template, Map<String, Object> paramMap) {
            if ("error".equals(template)) {
                // Simulate error by returning null
                return null;
            }
            return template;
        }
    }

    // Test helper class
    private static class TestUser {

 * that is already in the desired state.
 *
 * <p>When testing code that uses this class, use {@link #createUnstarted(Ticker)} or {@link
 * #createStarted(Ticker)} to supply a fake or mock ticker. This allows you to simulate any valid
 * behavior of the stopwatch.
 *
 * <p><b>Note:</b> This class is not thread-safe.
 *
 * <p><b>Warning for Android users:</b> a stopwatch with default behavior may not continue to keep

        }
    }

    // Test property filter returning null simulation
    @Test
    public void test_get_filterReturnsNull() {
        // The filter.null property is configured to simulate null filter behavior
        try {
            fessConfig.get("filter.null");
            fail("Should throw exception when property is not found");
        } catch (ConfigPropertyNotFoundException e) {