--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/net/httpclient/reactivestreams-tck/org/reactivestreams/tck/flow/support/Optional.java	Tue Jul 02 13:25:51 2019 +0100
@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package org.reactivestreams.tck.flow.support;
+
+import java.util.NoSuchElementException;
+
+// simplest possible version of Scala's Option type
+public abstract class Optional<T> {
+
+  private static final Optional<Object> NONE = new Optional<Object>() {
+    @Override
+    public Object get() {
+      throw new NoSuchElementException(".get call on None!");
+    }
+
+    @Override
+    public boolean isEmpty() {
+      return true;
+    }
+  };
+
+  private Optional() {
+  }
+
+  @SuppressWarnings("unchecked")
+  public static <T> Optional<T> empty() {
+    return (Optional<T>) NONE;
+  }
+
+  @SuppressWarnings("unchecked")
+  public static <T> Optional<T> of(T it) {
+    if (it == null) return (Optional<T>) Optional.NONE;
+    else return new Some(it);
+  }
+
+  public abstract T get();
+
+  public abstract boolean isEmpty();
+
+  public boolean isDefined() {
+    return !isEmpty();
+  }
+
+  public static class Some<T> extends Optional<T> {
+    private final T value;
+
+    Some(T value) {
+      this.value = value;
+    }
+
+    @Override
+    public T get() {
+      return value;
+    }
+
+    @Override
+    public boolean isEmpty() {
+      return false;
+    }
+
+    @Override
+    public String toString() {
+      return String.format("Some(%s)", value);
+    }
+  }
+
+  @Override
+  public String toString() {
+    return "None";
+  }
+}