private List<CrawlingInfoParam> storedParams;

            @Override
            public CrawlingInfo getLast(String sessionId) {
                return null; // Return null to simulate create scenario
            }

            @Override
            public void store(CrawlingInfo entity) {
                storedInfo = entity;
                assertEquals(sessionId, entity.getSessionId());

                processCalled = true;
                processOrigin = origin;
                processRequest = request;
                processResponse = response;

                // Simulate adding headers for testing
                if (response instanceof HttpServletResponse) {
                    HttpServletResponse httpResponse = (HttpServletResponse) response;

        final String tempPath = "/tmp/test.tmp";
        final String outputPath = "/tmp/output.jpg";

        // Simulate the variable replacement logic from the source code
        final List<String> processedCommands = new ArrayList<>();
        for (final String command : commands) {

    // incomplete.
    val creator = cache.edit("k1")!!
    creator.newSink(0).buffer().use {
      it.writeUtf8("Hello")
    }

    // Simulate a severe Filesystem failure on the first initialization.
    filesystem.setFaultyDelete(cacheDir / "k1.0.tmp", true)
    filesystem.setFaultyDelete(cacheDir, true)
    cache =

            when(mockNameServiceClient.getLocalHost()).thenReturn(mockHost);
            when(mockHost.getHostName()).thenReturn(TEST_HOSTNAME);
            when(mockConfig.isUseUnicode()).thenReturn(false); // Simulate OEM encoding
            when(mockConfig.getDefaultDomain()).thenReturn(TEST_DOMAIN);

            Type2Message originalMessage = new Type2Message(mockContext,

	var bb Buffer
	bb.Grow(16 << 20)
	b.SetBytes(int64(bb.Available()))
	b.ReportAllocs()
	for i := 0; i < b.N; i++ {
		bb.Reset()
		b := bb.AvailableBuffer()
		b = b[:cap(b)] // use max capacity to simulate a large append operation
		bb.Write(b)    // should be nearly infinitely fast
	}

    ChannelFailover failover = new ChannelFailover(manager);
    
    ChannelInfo channel = createTestChannel("test-channel", 1000);
    manager.addChannel(channel);
    
    // Simulate failure
    IOException error = new IOException("Network error");
    failover.handleFailure(channel, error);
    
    // Verify channel marked as failed
    assertEquals(ChannelState.FAILED, channel.getState());

                    for (int i = 0; i < operationsPerThread; i++) {
                        // Simulate the atomic byte tracking operation
                        long start = System.nanoTime();
                        mockBytesEncrypted.addAndGet(1024); // Simulate 1KB message
                        long end = System.nanoTime();

                        totalTime.addAndGet(end - start);

    // Once a header field is decoded and added to the reconstructed header
    // list, it cannot be removed from it. Hence, foo is here.
    assertThat(hpackReader!!.getAndResetHeaderList()).isEqualTo(headerBlock)

    // Simulate receiving a small dynamic table size update, that implies eviction.
    bytesIn.writeByte(0x3F) // Dynamic table size update (size = 55).
    bytesIn.writeByte(0x18)
    hpackReader!!.readHeaders()

Luego puedes usar esta nueva clase en `response_class=PNGStreamingResponse` en tu *path operation function*:

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

### Simular un archivo { #simulate-a-file }

En este ejemplo estamos simulando un archivo con `io.BytesIO`, que es un objeto tipo archivo que vive solo en memoria, pero nos permite usar la misma interfaz.