* Returns an {@link Optional} containing the first element in this fluent iterable. If the
   * iterable is empty, {@code Optional.absent()} is returned.
   *
   * <p><b>{@code Stream} equivalent:</b> if the goal is to obtain any element, {@link
   * Stream#findAny}; if it must specifically be the <i>first</i> element, {@code Stream#findFirst}.
   *
   * @throws NullPointerException if the first element is null; if this is a possibility, use {@code

    // Yield the first IP address so the second IP address completes first.
    val firstConnectLatch = CountDownLatch(1)
    val socketFactory =
      object : DelegatingSocketFactory(SocketFactory.getDefault()) {
        var first = true

        override fun createSocket(): Socket {
          if (first) {
            first = false
            firstConnectLatch.await()
          }

  public void testRemove_size1() {
    assertEquals("size1Queue.remove() should return first element", e0(), getQueue().remove());
    expectMissing(e0());
  }

  @CollectionFeature.Require({KNOWN_ORDER, SUPPORTS_REMOVE})
  @CollectionSize.Require(SEVERAL)
  public void testRemove_sizeMany() {
    assertEquals("sizeManyQueue.remove() should return first element", e0(), getQueue().remove());
    expectMissing(e0());
  }

  }

  private static final class ConverterComposition<A, B, C> extends Converter<A, C>
      implements Serializable {
    final Converter<A, B> first;
    final Converter<B, C> second;

    ConverterComposition(Converter<A, B> first, Converter<B, C> second) {
      this.first = first;
      this.second = second;
    }

    /*
     * These gymnastics are a little confusing. Basically this class has neither legacy nor

        verify(mockDcerpcHandle, times(1)).sendrecv(any(MsrpcLsarOpenPolicy2.class));
    }

    @Test
    void close_shouldClosePolicySuccessfully() throws IOException {
        // Arrange
        // First, successfully create an LsaPolicyHandle instance
        doAnswer(invocation -> {
            MsrpcLsarOpenPolicy2 rpc = invocation.getArgument(0);
            rpc.retval = 0;
            return null;

$(function() {
  $('input[type="text"],select,textarea', ".login-box,section.content")
    .first()
    .focus();
  $(".form-group .has-error")
    .first()
    .next("input,select,textarea")
    .focus();

  $("section.content input").keypress(function(e) {
    if (e.which === 13) {
      var $submitButton = $("input#submit, button#submit");
      if ($submitButton.size() > 0) {
        $submitButton[0].submit();
      }

  public void testElement_size1() {
    assertEquals("size1Queue.element() should return first element", e0(), getQueue().element());
    expectUnchanged();
  }

  @CollectionFeature.Require(KNOWN_ORDER)
  @CollectionSize.Require(SEVERAL)
  public void testElement_sizeMany() {
    assertEquals("sizeManyQueue.element() should return first element", e0(), getQueue().element());
    expectUnchanged();
  }

  public void testPeek_size1() {
    assertEquals("size1Queue.peek() should return first element", e0(), getQueue().peek());
    expectUnchanged();
  }

  @CollectionFeature.Require(KNOWN_ORDER)
  @CollectionSize.Require(SEVERAL)
  public void testPeek_sizeMany() {
    assertEquals("sizeManyQueue.peek() should return first element", e0(), getQueue().peek());
    expectUnchanged();
  }

        verify(mockDcerpcHandle, times(1)).sendrecv(any(MsrpcLsarOpenPolicy2.class));
    }

    @Test
    void close_shouldClosePolicySuccessfully() throws IOException {
        // Arrange
        // First, successfully create an LsaPolicyHandle instance
        doAnswer(invocation -> {
            MsrpcLsarOpenPolicy2 rpc = invocation.getArgument(0);
            rpc.retval = 0;
            return null;

    @DisplayName("acquire calls tree.acquire on first usage, release calls tree.release at zero")
    void acquire_release_lifecycle() {
        SmbTreeConnection c = newConn();
        SmbTreeImpl tree = mock(SmbTreeImpl.class);
        when(tree.acquire(false)).thenReturn(tree);
        when(tree.acquire()).thenReturn(tree);

        setTree(c, tree);

        // Act: first acquire triggers tree.acquire()
        c.acquire();