.onRequestStart(CloseSocket())
        .build(),
    )
    val webSocket = newWebSocket()
    clientListener.assertFailure(
      101,
      null,
      ProtocolException::class.java,
      "Expected 'Connection' header value 'Upgrade' but was 'null'",
    )
    webSocket.cancel()
  }

  @Test
  @Throws(IOException::class)
  fun wrongConnectionHeader() {
    webServer.enqueue(

                    parameters = null,
                  ),
                subjectPublicKey =
                  BitString(
                    byteString = publicKeyBytes,
                    unusedBitsCount = 0,
                  ),
              ),
            issuerUniqueID = null,
            subjectUniqueID = null,
            extensions = listOf(),
          ),

    protected AbstractArtifactResolutionException(String message, Artifact artifact) {
        this(message, artifact, null);
    }

    protected AbstractArtifactResolutionException(
            String message, Artifact artifact, List<ArtifactRepository> remoteRepositories) {
        this(message, artifact, remoteRepositories, null);
    }

    protected AbstractArtifactResolutionException(

    serverSocket.reuseAddress = true
    while (true) {
      var socket: Socket? = null
      try {
        socket = serverSocket.accept()
        val sslSocket = doSsl(socket)
        val protocolString = Platform.get().getSelectedProtocol(sslSocket)
        val protocol = if (protocolString != null) get(protocolString) else null
        if (protocol != Protocol.HTTP_2) {

    expectUnchanged();
    assertTrue(collection.contains(e0()));
  }

  /*
   * AbstractCollection fails the removeAll(null) test when the subject
   * collection is empty, but we'd still like to test removeAll(null) when we
   * can. We split the test into empty and non-empty cases. This allows us to
   * suppress only the former.
   */

  @CollectionFeature.Require(SUPPORTS_REMOVE)

      } catch (_: InvocationTargetException) {
        null
      }
  }

  companion object {
    val Tag = "OkHttp"

    val isSupported: Boolean = isAndroid && Build.VERSION.SDK_INT in 21 until 29

    fun buildIfSupported(): Platform? = if (isSupported) AndroidPlatform() else null
  }

<div class="screenshot">
<img src="/img/tutorial/separate-openapi-schemas/image02.png">
</div>

Это означает, что у него **всегда будет какое‑то значение**, просто иногда это значение может быть `None` (или `null` в JSON).

            if (minimumSupported != null) {
                require(minimumSupported >= minimumMinimum) {
                    "minimumSupported must be at least $minimumMinimum, was $minimumSupported"
                }
            }
        }

        private
        val VersionNumber.isStable: Boolean
            get() = qualifier == null

        private

    exit 1
  elif command -v sha256sum >/dev/null; then
    if echo "$distributionSha256Sum  $TMP_DOWNLOAD_DIR/$distributionUrlName" | sha256sum -c >/dev/null 2>&1; then
      distributionSha256Result=true
    fi
  elif command -v shasum >/dev/null; then
    if echo "$distributionSha256Sum  $TMP_DOWNLOAD_DIR/$distributionUrlName" | shasum -a 256 -c >/dev/null 2>&1; then
      distributionSha256Result=true
    fi
  else

   * <p>The {@code @Nullable} annotations on the {@code equalityGroup} parameter imply that the
   * objects, and the array itself, can be null. That is for programmer convenience, when the
   * objects come from factory methods that are themselves {@code @Nullable}. In reality neither the
   * array nor its contents can be null, but it is not useful to force the use of {@code
   * requireNonNull} or the like just to assert that.
   *