+str #19443 add support or Java Stream

akka-stream-tests/src/test/java/akka/stream/io/SinkAsJavaSourceTest.java

@@ -0,0 +1,39 @@
+/**
+ * Copyright (C) 2015-2016 Lightbend Inc. <http://www.lightbend.com>
+ */
+package akka.stream.io;
+
+
+import akka.stream.StreamTest;
+import akka.stream.javadsl.AkkaJUnitActorSystemResource;
+import akka.stream.javadsl.Sink;
+import akka.stream.javadsl.Source;
+import akka.stream.javadsl.StreamConverters;
+import akka.stream.testkit.Utils;
+import org.junit.ClassRule;
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import static org.junit.Assert.assertEquals;
+
+public class SinkAsJavaSourceTest extends StreamTest {
+    public SinkAsJavaSourceTest() {
+        super(actorSystemResource);
+    }
+
+    @ClassRule
+    public static AkkaJUnitActorSystemResource actorSystemResource = new AkkaJUnitActorSystemResource("OutputStreamSource",
+            Utils.UnboundedMailboxConfig());
+
+    @Test
+    public void mustBeAbleToUseAsJavaStream() throws Exception {
+        final List<Integer> list = Arrays.asList(1, 2, 3);
+        final Sink<Integer, Stream<Integer>> streamSink = StreamConverters.asJavaStream();
+        java.util.stream.Stream<Integer> javaStream= Source.from(list).runWith(streamSink, materializer);
+        assertEquals(list, javaStream.collect(Collectors.toList()));
+    }
+}