// Write metadata to the end of the file.
    writeMetadata(upstreamSize)
    file!!.channel.force(false)

    // Once everything else is in place we can swap the dirty header for a clean one.
    writeHeader(PREFIX_CLEAN, upstreamSize, metadata.size.toLong())
    file!!.channel.force(false)

    // This file is complete.
    synchronized(this@Relay) {
      complete = true
    }

    val request: Request
      get() = originalRequest

    val call: RealCall
      get() = this@RealCall

    /**
     * Attempt to enqueue this async call on [executorService]. This will attempt to clean up
     * if the executor has been shut down by reporting the call as failed.
     */
    fun executeOn(executorService: ExecutorService) {
      client.dispatcher.assertThreadDoesntHoldLock()

    assertThat(source.read(sourceBuffer, 1024)).isEqualTo(-1)
    assertThat(sourceBuffer.size).isEqualTo(0)
    source.close()
    assertThat(relay.isClosed).isTrue()
    assertFile(Relay.PREFIX_CLEAN, 13L, metadata.size, "abcdefghijklm", metadata)
  }

  @Test
  fun multipleSources() {
    val upstream = Buffer()
    upstream.writeUtf8("abcdefghijklm")
    val relay = edit(file, upstream, metadata, 1024)

1. Script the mocks.
2. Run application code.
3. Verify that the expected requests were made.

Here's a complete example:

```java
public void test() throws Exception {
  // Create a MockWebServer. These are lean enough that you can create a new
  // instance for every unit test.
  MockWebServer server = new MockWebServer();

  // Schedule some responses.
  server.enqueue(new MockResponse().setBody("hello, world!"));

        trusted.certificate,
      )
    assertThat(cleaner.clean(list(certB, certA), "hostname")).isEqualTo(
      list(certB, certA, trusted, selfSigned),
    )
    assertThat(cleaner.clean(list(certB, certA, trusted), "hostname")).isEqualTo(
      list(certB, certA, trusted, selfSigned),
    )
    assertThat(cleaner.clean(list(certB, certA, trusted, selfSigned), "hostname"))
      .isEqualTo(

 * cannot do TLS over domain sockets.
 */
public class ClientAndServer {
  public void run() throws Exception {
    File socketFile = new File("/tmp/ClientAndServer.sock");
    socketFile.delete(); // Clean up from previous runs.

    MockWebServer server = new MockWebServer();
    server.setServerSocketFactory(new UnixDomainServerSocketFactory(socketFile));

        Array<X509Certificate>::class.java,
        String::class.java,
        String::class.java,
      )
    } catch (_: NoSuchMethodException) {
      null
    }

  /** Android method to clean and sort certificates, called via reflection. */
  @Suppress("unused", "UNCHECKED_CAST")
  fun checkServerTrusted(
    chain: Array<out X509Certificate>,
    authType: String,
    host: String,
  ): List<Certificate> {

  private val x509TrustManagerExtensions: X509TrustManagerExtensions,
) : CertificateChainCleaner() {
  @Suppress("UNCHECKED_CAST")
  @Throws(SSLPeerUnverifiedException::class)
  @SuppressSignatureCheck
  override fun clean(
    chain: List<Certificate>,
    hostname: String,
  ): List<Certificate> {
    val certificates = (chain as List<X509Certificate>).toTypedArray()
    try {

    }
  }

internal fun commonHeadersOf(vararg inputNamesAndValues: String): Headers {
  require(inputNamesAndValues.size % 2 == 0) { "Expected alternating header names and values" }

  // Make a defensive copy and clean it up.
  val namesAndValues: Array<String> = arrayOf(*inputNamesAndValues)
  for (i in namesAndValues.indices) {
    require(namesAndValues[i] != null) { "Headers cannot be null" }

   *     1
   *     100
   *     2
   *
   *     CLEAN 3400330d1dfc7f3f7f4b8d4d803dfcf6 832 21054
   *     DIRTY 335c4c6028171cfddfbaae1a9c313c52
   *     CLEAN 335c4c6028171cfddfbaae1a9c313c52 3934 2342
   *     REMOVE 335c4c6028171cfddfbaae1a9c313c52
   *     DIRTY 1ab96a171faeeee38496d8b330771a7a
   *     CLEAN 1ab96a171faeeee38496d8b330771a7a 1600 234
   *     READ 335c4c6028171cfddfbaae1a9c313c52