return AbstractExecutionThreadService.this.toString();
        }
      };

  /** Constructor for use by subclasses. */
  protected AbstractExecutionThreadService() {}

  /**
   * Start the service. This method is invoked on the execution thread.
   *
   * <p>By default this method does nothing.
   */
  protected void startUp() throws Exception {}

  /**

    }

    @Test
    @DisplayName("Should handle null in middle of multiple elements")
    void testJoinNullInMiddle() {
        String result = StringUtil.join("-", "start", null, null, "end");
        assertEquals("start-null-null-end", result);
    }

        recordNameField.set(nameQueryResponse, mockRecordName);

        // Prepare a byte array with valid NetBIOS name format
        byte[] src = new byte[100];
        int srcIndex = 0;

        // Start with compressed name pointer (0xC0) to use questionName
        src[srcIndex] = (byte) 0xC0;
        src[srcIndex + 1] = 0x0C; // Pointer offset
        // recordType (2 bytes)
        src[srcIndex + 2] = 0x00;

        q1x.setDaemon(true);
        q20.setDaemon(true);
        try {
            synchronized (sem) {
                q1x.start();
                q20.start();

                while (sem.count > 0 && q1x.getAnswer() == null && q20.getAnswer() == null) {
                    sem.wait();
                }
            }

    /**
     * Returns the sort.
     *
     * @return The sort.
     */
    public abstract String getSort();

    /**
     * Returns the start position.
     *
     * @return The start position.
     */
    public abstract int getStartPosition();

    /**
     * Returns the page size.
     *
     * @return The page size.
     */

            } else {
                c++;
            }
        } while (i-- > e);
        return scope.length() + 2;
    }

    int readScopeWireFormat(final byte[] src, int srcIndex) {
        final int start = srcIndex;
        int n;
        StringBuilder sb;

        n = src[srcIndex++] & 0xFF;
        if (n == 0) {
            scope = null;
            return 1;
        }

        try {

 * @JvmField @Rule val serverRule = MockWebServerRule()
 * ```
 */
class MockWebServerRule : ExternalResource() {
  val server: MockWebServer = MockWebServer()

  override fun before() {
    try {
      server.start()
    } catch (e: IOException) {
      throw RuntimeException(e)
    }
  }

  override fun after() {
    server.close()
  }

  @Test
  fun passingTest() {
    assertThat("hello").isEqualTo("hello")
  }

  @Test
  fun testMockWebServer() {
    server.enqueue(MockResponse(body = "abc"))
    server.start()

    client.newCall(Request(url = server.url("/"))).execute().use {
      assertThat(it.body.string()).isEqualTo("abc")
    }
  }

  @Test
  fun testExternalSite() {

  public abstract boolean find();

  public abstract boolean find(int index);

  public abstract String replaceAll(String replacement);

  public abstract int end();

  public abstract int start();

     */
    public static String url(final String input) {
        if (input == null) {
            final String msg = "The argument 'input' should not be null.";
            throw new IllegalArgumentException(msg);
        }
        if (!input.startsWith("/")) {
            final String msg = "The argument 'input' should start with slash '/': " + input;