@Test
  fun requestHeaderValidationIsStrict() {
    assertFailsWith<IllegalArgumentException> {
      Request
        .Builder()
        .addHeader("a\tb", "Value")
    }
    assertFailsWith<IllegalArgumentException> {
      Request
        .Builder()
        .addHeader("Name", "c\u007fd")
    }
    assertFailsWith<IllegalArgumentException> {
      Request
        .Builder()

        if (dest == null) {
            throw new IllegalArgumentException("Destination cannot be null");
        }
        if (b == null || b.length == 0) {
            throw new IllegalArgumentException("Buffer array cannot be null or empty");
        }
        if (bsize <= 0) {
            throw new IllegalArgumentException("Buffer size must be positive");
        }

        try {

    assertFailsWith<IllegalArgumentException> {
      requestBuilder.url("ftp://hostname/path")
    }.also { expected ->
      assertThat(expected.message).isEqualTo("Expected URL scheme 'http' or 'https' but was 'ftp'")
    }
  }

  @Test
  fun invalidPort() {
    val requestBuilder = Request.Builder()
    assertFailsWith<IllegalArgumentException> {
      requestBuilder.url("http://localhost:65536/")

     *
     * @throws ExecutionException if {@code closingFuture} is a failed step
     * @throws CancellationException if the {@code closingFuture}'s future was cancelled
     * @throws IllegalArgumentException if {@code closingFuture} is not one of the futures passed to
     *     {@link #whenAllComplete(Iterable)} or {@link #whenAllComplete(Iterable)}
     * @throws IllegalStateException if called outside of a call to {@link

     */
    protected void assertPropertyNotNull(String property) {
        if (property == null) {
            String msg = "The argument 'property' for message should not be null.";
            throw new IllegalArgumentException(msg);
        }
    }

     *
     * @throws ExecutionException if {@code closingFuture} is a failed step
     * @throws CancellationException if the {@code closingFuture}'s future was cancelled
     * @throws IllegalArgumentException if {@code closingFuture} is not one of the futures passed to
     *     {@link #whenAllComplete(Iterable)} or {@link #whenAllComplete(Iterable)}
     * @throws IllegalStateException if called outside of a call to {@link