```kotlin
val response = MockResponse.Builder()
  .addHeader("Content-Type", "application/json; charset=utf-8")
  .addHeader("Cache-Control", "no-cache")
  .body("{}")
  .build()
```

MockResponse can be used to simulate a slow network. This is useful for
testing timeouts and interactive testing.

### Java
```java
MockResponse response = new MockResponse.Builder()
    .throttleBody(1024, 1, TimeUnit.SECONDS)
    .build();

  TFE_TensorHandle* h1_task0 = TestMatrixTensorHandle(ctx);
  std::vector<TFE_TensorHandle*> handles_task0;
  if (heavy_load_on_streaming_rpc) {
    // Send 50 tensor copy requests to simulate that there have been some RPC
    // requests been enqueued.
    for (int i = 0; i < 50; ++i) {
      handles_task0.push_back(TestMatrixTensorHandle(ctx));
    }
  }

        }

        @Override
        protected FileEntry open() throws CIFSException {
            if (staticThrowOnOpen)
                throw new CIFSException("open fail");
            // Simulate fetching first page during open
            if (staticPages != null && !staticPages.isEmpty()) {
                pageIdx = 0;
            }
            // Return the initial element if provided

    }

    @Test
    void testReadSecurityBuffer() {
        // Test readSecurityBuffer
        byte[] data = new byte[20];
        byte[] content = "Hello".getBytes();

        // Simulate a security buffer structure: length (2 bytes), length (2 bytes), offset (4 bytes)
        // Length = 5, Offset = 8
        ByteBuffer buffer = ByteBuffer.wrap(data).order(ByteOrder.LITTLE_ENDIAN);

            byte[] buffer1 = new byte[10];
            byte[] buffer2 = new byte[10];
            SMBUtil.writeInt2(4, buffer1, 0);
            SMBUtil.writeInt2(4, buffer2, 0);

            // When - simulate concurrent access
            Thread thread1 = new Thread(() -> {
                try {
                    response.readBytesWireFormat(buffer1, 0);
                } catch (SMBProtocolDecodingException e) {

    }

    @Test
    public void test_getXContentBuilderOutputStream_ioException() {
        XContentBuilderCallback callback = (builder, params) -> {
            // Simulate IOException by creating invalid state
            throw new IOException("Test exception");
        };

        OutputStream outputStream = SearchEngineUtil.getXContentBuilderOutputStream(callback, XContentType.JSON);

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

然后你可以在*路径操作函数*中通过 `response_class=PNGStreamingResponse` 使用这个新类：

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

### 模拟文件 { #simulate-a-file }

在这个示例中，我们用 `io.BytesIO` 模拟了一个文件，它是只驻留在内存中的类文件对象，但提供相同的接口。

例如，我们可以像对文件那样迭代它来消费其内容。

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

/// note | 技术细节

 * 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

import jcifs.config.PropertyConfiguration;
import jcifs.context.BaseContext;
import jcifs.smb.NtlmPasswordAuthentication;

/**
 * Tests for the NtlmHttpURLConnection class.
 * This class uses Mockito to simulate the behavior of HttpURLConnection and other dependencies.
 */
@ExtendWith(MockitoExtension.class)
@MockitoSettings(strictness = Strictness.LENIENT)
class NtlmHttpURLConnectionTest {

    @Mock

        assertEquals(0, transport.getNumSessions());
    }

    @Test
    @DisplayName("isDisconnected / isFailed reflect socket and state")
    void connectionStateChecks() throws Exception {
        // Arrange: simulate connected state and open socket
        setField(transport, "state", 3); // connected
        Socket s = mock(Socket.class);
        when(s.isClosed()).thenReturn(false);
        setField(transport, "socket", s);