http://git-wip-us.apache.org/repos/asf/flink/blob/a2eb6cc8/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/StreamGroupedFoldTest.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.streaming.api.operators;
+
+import java.util.concurrent.ConcurrentLinkedQueue;
+
+import org.apache.flink.api.common.functions.FoldFunction;
+import org.apache.flink.api.common.functions.RichFoldFunction;
+import org.apache.flink.api.common.functions.RichReduceFunction;
+import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.api.java.functions.KeySelector;
+import org.apache.flink.api.java.typeutils.TypeExtractor;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.watermark.Watermark;
+import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
+import org.apache.flink.streaming.util.OneInputStreamOperatorTestHarness;
+import org.apache.flink.streaming.util.TestHarnessUtil;
+import org.joda.time.Instant;
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * Tests for {@link StreamGroupedFold}. These test that:
+ *
+ * <ul>
+ *     <li>RichFunction methods are called correctly</li>
+ *     <li>Timestamps of processed elements match the input timestamp</li>
+ *     <li>Watermarks are correctly forwarded</li>
+ * </ul>
+ */
+public class StreamGroupedFoldTest {
+
+       private static class MyFolder implements FoldFunction<Integer, String> {
+
+               private static final long serialVersionUID = 1L;
+
+               @Override
+               public String fold(String accumulator, Integer value) throws 
Exception {
+                       return accumulator + value.toString();
+               }
+
+       }
+
+       @Test
+       @SuppressWarnings("unchecked")
+       public void testGroupedFold() throws Exception {
+               TypeInformation<String> outType = TypeExtractor.getForObject("A 
string");
+
+               StreamGroupedFold<Integer, String> operator = new 
StreamGroupedFold<Integer, String>(
+                               new MyFolder(), new KeySelector<Integer, 
String>() {
+
+                       private static final long serialVersionUID = 1L;
+
+                       @Override
+                       public String getKey(Integer value) throws Exception {
+                               return value.toString();
+                       }
+               }, "100", outType);
+
+               OneInputStreamOperatorTestHarness<Integer, String> testHarness 
= new OneInputStreamOperatorTestHarness<Integer, String>(operator);
+
+               long initialTime = 0L;
+               ConcurrentLinkedQueue expectedOutput = new 
ConcurrentLinkedQueue();
+
+               testHarness.open();
+
+               testHarness.processElement(new StreamRecord<Integer>(1, 
initialTime + 1));
+               testHarness.processElement(new StreamRecord<Integer>(1, 
initialTime + 2));
+               testHarness.processWatermark(new Watermark(initialTime + 2));
+               testHarness.processElement(new StreamRecord<Integer>(2, 
initialTime + 3));
+               testHarness.processElement(new StreamRecord<Integer>(2, 
initialTime + 4));
+               testHarness.processElement(new StreamRecord<Integer>(3, 
initialTime + 5));
+
+               expectedOutput.add(new StreamRecord<String>("1001", initialTime 
+ 1));
+               expectedOutput.add(new StreamRecord<String>("10011", 
initialTime + 2));
+               expectedOutput.add(new Watermark(initialTime + 2));
+               expectedOutput.add(new StreamRecord<String>("1002", initialTime 
+ 3));
+               expectedOutput.add(new StreamRecord<String>("10022", 
initialTime + 4));
+               expectedOutput.add(new StreamRecord<String>("1003", initialTime 
+ 5));
+
+               TestHarnessUtil.assertOutputEquals("Output was not correct.", 
expectedOutput, testHarness.getOutput());
+       }
+
+       @Test
+       public void testOpenClose() throws Exception {
+               StreamGroupedFold<Integer, String> operator = new 
StreamGroupedFold<Integer, String>(new TestOpenCloseFoldFunction(), new 
KeySelector<Integer, Integer>() {
+                       private static final long serialVersionUID = 1L;
+
+                       @Override
+                       public Integer getKey(Integer value) throws Exception {
+                               return value;
+                       }
+               }, "init", BasicTypeInfo.STRING_TYPE_INFO);
+               OneInputStreamOperatorTestHarness<Integer, String> testHarness 
= new OneInputStreamOperatorTestHarness<Integer, String>(operator);
+
+               long initialTime = 0L;
+
+               testHarness.open();
+
+               testHarness.processElement(new StreamRecord<Integer>(1, 
initialTime));
+               testHarness.processElement(new StreamRecord<Integer>(2, 
initialTime));
+
+               testHarness.close();
+
+               Assert.assertTrue("RichFunction methods where not called.", 
TestOpenCloseFoldFunction.closeCalled);
+               Assert.assertTrue("Output contains no elements.", 
testHarness.getOutput().size() > 0);
+       }
+
+       // This must only be used in one test, otherwise the static fields will 
be changed
+       // by several tests concurrently
+       private static class TestOpenCloseFoldFunction extends 
RichFoldFunction<Integer, String> {
+               private static final long serialVersionUID = 1L;
+
+               public static boolean openCalled = false;
+               public static boolean closeCalled = false;
+
+               @Override
+               public void open(Configuration parameters) throws Exception {
+                       super.open(parameters);
+                       if (closeCalled) {
+                               Assert.fail("Close called before open.");
+                       }
+                       openCalled = true;
+               }
+
+               @Override
+               public void close() throws Exception {
+                       super.close();
+                       if (!openCalled) {
+                               Assert.fail("Open was not called before 
close.");
+                       }
+                       closeCalled = true;
+               }
+
+               @Override
+               public String fold(String acc, Integer in) throws Exception {
+                       if (!openCalled) {
+                               Assert.fail("Open was not called before run.");
+                       }
+                       return acc + in;
+               }
+       }
+}

http://git-wip-us.apache.org/repos/asf/flink/blob/a2eb6cc8/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/StreamGroupedReduceTest.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.streaming.api.operators;
+
+
+import java.util.concurrent.ConcurrentLinkedQueue;
+
+import org.apache.flink.api.common.functions.ReduceFunction;
+import org.apache.flink.api.common.functions.RichReduceFunction;
+import org.apache.flink.api.java.functions.KeySelector;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.watermark.Watermark;
+import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
+import org.apache.flink.streaming.util.OneInputStreamOperatorTestHarness;
+import org.apache.flink.streaming.util.TestHarnessUtil;
+import org.joda.time.Instant;
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * Tests for {@link StreamGroupedReduce}. These test that:
+ *
+ * <ul>
+ *     <li>RichFunction methods are called correctly</li>
+ *     <li>Timestamps of processed elements match the input timestamp</li>
+ *     <li>Watermarks are correctly forwarded</li>
+ * </ul>
+ */
+
+public class StreamGroupedReduceTest {
+
+       private static class MyReducer implements ReduceFunction<Integer> {
+
+               private static final long serialVersionUID = 1L;
+
+               @Override
+               public Integer reduce(Integer value1, Integer value2) throws 
Exception {
+                       return value1 + value2;
+               }
+
+       }
+
+       @Test
+       @SuppressWarnings("unchecked")
+       public void testGroupedReduce() throws Exception {
+               StreamGroupedReduce<Integer> operator = new 
StreamGroupedReduce<Integer>(new MyReducer(), new KeySelector<Integer, 
Integer>() {
+                       private static final long serialVersionUID = 1L;
+
+                       @Override
+                       public Integer getKey(Integer value) throws Exception {
+                               return value;
+                       }
+               });
+
+               OneInputStreamOperatorTestHarness<Integer, Integer> testHarness 
= new OneInputStreamOperatorTestHarness<Integer, Integer>(operator);
+
+               long initialTime = 0L;
+               ConcurrentLinkedQueue expectedOutput = new 
ConcurrentLinkedQueue();
+
+               testHarness.open();
+
+               testHarness.processElement(new StreamRecord<Integer>(1, 
initialTime + 1));
+               testHarness.processElement(new StreamRecord<Integer>(1, 
initialTime + 2));
+               testHarness.processWatermark(new Watermark(initialTime + 2));
+               testHarness.processElement(new StreamRecord<Integer>(2, 
initialTime + 3));
+               testHarness.processElement(new StreamRecord<Integer>(2, 
initialTime + 4));
+               testHarness.processElement(new StreamRecord<Integer>(3, 
initialTime + 5));
+
+               expectedOutput.add(new StreamRecord<Integer>(1, initialTime + 
1));
+               expectedOutput.add(new StreamRecord<Integer>(2, initialTime + 
2));
+               expectedOutput.add(new Watermark(initialTime + 2));
+               expectedOutput.add(new StreamRecord<Integer>(2, initialTime + 
3));
+               expectedOutput.add(new StreamRecord<Integer>(4, initialTime + 
4));
+               expectedOutput.add(new StreamRecord<Integer>(3, initialTime + 
5));
+
+               TestHarnessUtil.assertOutputEquals("Output was not correct.", 
expectedOutput, testHarness.getOutput());
+       }
+
+       @Test
+       public void testOpenClose() throws Exception {
+               StreamGroupedReduce<Integer> operator = new 
StreamGroupedReduce<Integer>(new TestOpenCloseReduceFunction(), new 
KeySelector<Integer, Integer>() {
+                       private static final long serialVersionUID = 1L;
+
+                       @Override
+                       public Integer getKey(Integer value) throws Exception {
+                               return value;
+                       }
+               });
+               OneInputStreamOperatorTestHarness<Integer, Integer> testHarness 
= new OneInputStreamOperatorTestHarness<Integer, Integer>(operator);
+
+               long initialTime = 0L;
+
+               testHarness.open();
+
+               testHarness.processElement(new StreamRecord<Integer>(1, 
initialTime));
+               testHarness.processElement(new StreamRecord<Integer>(2, 
initialTime));
+
+               testHarness.close();
+
+               Assert.assertTrue("RichFunction methods where not called.", 
TestOpenCloseReduceFunction.closeCalled);
+               Assert.assertTrue("Output contains no elements.", 
testHarness.getOutput().size() > 0);
+       }
+
+       // This must only be used in one test, otherwise the static fields will 
be changed
+       // by several tests concurrently
+       private static class TestOpenCloseReduceFunction extends 
RichReduceFunction<Integer> {
+               private static final long serialVersionUID = 1L;
+
+               public static boolean openCalled = false;
+               public static boolean closeCalled = false;
+
+               @Override
+               public void open(Configuration parameters) throws Exception {
+                       super.open(parameters);
+                       if (closeCalled) {
+                               Assert.fail("Close called before open.");
+                       }
+                       openCalled = true;
+               }
+
+               @Override
+               public void close() throws Exception {
+                       super.close();
+                       if (!openCalled) {
+                               Assert.fail("Open was not called before 
close.");
+                       }
+                       closeCalled = true;
+               }
+
+               @Override
+               public Integer reduce(Integer in1, Integer in2) throws 
Exception {
+                       if (!openCalled) {
+                               Assert.fail("Open was not called before run.");
+                       }
+                       return in1 + in2;
+               }
+       }
+}

http://git-wip-us.apache.org/repos/asf/flink/blob/a2eb6cc8/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/StreamMapTest.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.streaming.api.operators;
+
+import java.util.concurrent.ConcurrentLinkedQueue;
+
+import org.apache.flink.api.common.functions.MapFunction;
+import org.apache.flink.api.common.functions.RichMapFunction;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.watermark.Watermark;
+import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
+import org.apache.flink.streaming.util.OneInputStreamOperatorTestHarness;
+import org.apache.flink.streaming.util.TestHarnessUtil;
+import org.joda.time.Instant;
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * Tests for {@link StreamMap}. These test that:
+ *
+ * <ul>
+ *     <li>RichFunction methods are called correctly</li>
+ *     <li>Timestamps of processed elements match the input timestamp</li>
+ *     <li>Watermarks are correctly forwarded</li>
+ * </ul>
+ */
+public class StreamMapTest {
+
+       private static class Map implements MapFunction<Integer, String> {
+               private static final long serialVersionUID = 1L;
+
+               @Override
+               public String map(Integer value) throws Exception {
+                       return "+" + (value + 1);
+               }
+       }
+       
+       @Test
+       public void testMap() throws Exception {
+               StreamMap<Integer, String> operator = new StreamMap<Integer, 
String>(new Map());
+
+               OneInputStreamOperatorTestHarness<Integer, String> testHarness 
= new OneInputStreamOperatorTestHarness<Integer, String>(operator);
+
+               long initialTime = 0L;
+               ConcurrentLinkedQueue expectedOutput = new 
ConcurrentLinkedQueue();
+
+               testHarness.open();
+
+               testHarness.processElement(new StreamRecord<Integer>(1, 
initialTime + 1));
+               testHarness.processElement(new StreamRecord<Integer>(2, 
initialTime + 2));
+               testHarness.processWatermark(new Watermark(initialTime + 2));
+               testHarness.processElement(new StreamRecord<Integer>(3, 
initialTime + 3));
+
+               expectedOutput.add(new StreamRecord<String>("+2", initialTime + 
1));
+               expectedOutput.add(new StreamRecord<String>("+3", initialTime + 
2));
+               expectedOutput.add(new Watermark(initialTime + 2));
+               expectedOutput.add(new StreamRecord<String>("+4", initialTime + 
3));
+
+               TestHarnessUtil.assertOutputEquals("Output was not correct.", 
expectedOutput, testHarness.getOutput());
+       }
+
+       @Test
+       public void testOpenClose() throws Exception {
+               StreamMap<String, String> operator = new StreamMap<String, 
String>(new TestOpenCloseMapFunction());
+
+               OneInputStreamOperatorTestHarness<String, String> testHarness = 
new OneInputStreamOperatorTestHarness<String, String>(operator);
+
+               long initialTime = 0L;
+
+               testHarness.open();
+
+               testHarness.processElement(new StreamRecord<String>("Hello", 
initialTime));
+
+               testHarness.close();
+
+               Assert.assertTrue("RichFunction methods where not called.", 
TestOpenCloseMapFunction.closeCalled);
+               Assert.assertTrue("Output contains no elements.", 
testHarness.getOutput().size() > 0);
+       }
+
+       // This must only be used in one test, otherwise the static fields will 
be changed
+       // by several tests concurrently
+       private static class TestOpenCloseMapFunction extends 
RichMapFunction<String, String> {
+               private static final long serialVersionUID = 1L;
+
+               public static boolean openCalled = false;
+               public static boolean closeCalled = false;
+
+               @Override
+               public void open(Configuration parameters) throws Exception {
+                       super.open(parameters);
+                       if (closeCalled) {
+                               Assert.fail("Close called before open.");
+                       }
+                       openCalled = true;
+               }
+
+               @Override
+               public void close() throws Exception {
+                       super.close();
+                       if (!openCalled) {
+                               Assert.fail("Open was not called before 
close.");
+                       }
+                       closeCalled = true;
+               }
+
+               @Override
+               public String map(String value) throws Exception {
+                       if (!openCalled) {
+                               Assert.fail("Open was not called before run.");
+                       }
+                       return value;
+               }
+       }
+}

http://git-wip-us.apache.org/repos/asf/flink/blob/a2eb6cc8/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/StreamProjectTest.java
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b/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/StreamProjectTest.java
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+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.streaming.api.operators;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+
+import java.io.Serializable;
+import java.util.HashSet;
+import java.util.concurrent.ConcurrentLinkedQueue;
+
+import org.apache.flink.api.common.ExecutionConfig;
+import org.apache.flink.api.common.functions.MapFunction;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.api.java.tuple.Tuple;
+import org.apache.flink.api.java.tuple.Tuple2;
+import org.apache.flink.api.java.tuple.Tuple3;
+import org.apache.flink.api.java.tuple.Tuple5;
+import org.apache.flink.api.java.typeutils.TupleTypeInfo;
+import org.apache.flink.api.java.typeutils.TypeExtractor;
+import org.apache.flink.api.java.typeutils.runtime.TupleSerializer;
+import org.apache.flink.streaming.api.datastream.StreamProjection;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.sink.SinkFunction;
+import org.apache.flink.streaming.api.watermark.Watermark;
+import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
+import org.apache.flink.streaming.util.OneInputStreamOperatorTestHarness;
+import org.apache.flink.streaming.util.TestHarnessUtil;
+import org.apache.flink.streaming.util.TestStreamEnvironment;
+import org.joda.time.Instant;
+import org.junit.Test;
+
+/**
+ * Tests for {@link StreamProject}. These test that:
+ *
+ * <ul>
+ *     <li>Timestamps of processed elements match the input timestamp</li>
+ *     <li>Watermarks are correctly forwarded</li>
+ * </ul>
+ */
+public class StreamProjectTest implements Serializable {
+       private static final long serialVersionUID = 1L;
+
+       @Test
+       public void testProject() throws Exception {
+
+               TypeInformation<Tuple5<Integer, String, Integer, String, 
Integer>> inType = TypeExtractor
+                               .getForObject(new Tuple5<Integer, String, 
Integer, String, Integer>(2, "a", 3, "b", 4));
+
+               int[] fields = new int[]{4, 4, 3};
+
+               TupleSerializer<Tuple3<Integer, Integer, String>> serializer =
+                               new TupleTypeInfo<Tuple3<Integer, Integer, 
String>>(StreamProjection.extractFieldTypes(fields, inType))
+                                               .createSerializer(new 
ExecutionConfig());
+               @SuppressWarnings("unchecked")
+               StreamProject<Tuple5<Integer, String, Integer, String, 
Integer>, Tuple3<Integer, Integer, String>> operator =
+                               new StreamProject<Tuple5<Integer, String, 
Integer, String, Integer>, Tuple3<Integer, Integer, String>>(
+                                               fields, serializer);
+
+               OneInputStreamOperatorTestHarness<Tuple5<Integer, String, 
Integer, String, Integer>, Tuple3<Integer, Integer, String>> testHarness = new 
OneInputStreamOperatorTestHarness<Tuple5<Integer, String, Integer, String, 
Integer>, Tuple3<Integer, Integer, String>>(operator);
+
+               long initialTime = 0L;
+               ConcurrentLinkedQueue expectedOutput = new 
ConcurrentLinkedQueue();
+
+               testHarness.open();
+
+               testHarness.processElement(new StreamRecord<Tuple5<Integer, 
String, Integer, String, Integer>>(new Tuple5<Integer, String, Integer, String, 
Integer>(2, "a", 3, "b", 4), initialTime + 1));
+               testHarness.processElement(new StreamRecord<Tuple5<Integer, 
String, Integer, String, Integer>>(new Tuple5<Integer, String, Integer, String, 
Integer>(2, "s", 3, "c", 2), initialTime + 2));
+               testHarness.processElement(new StreamRecord<Tuple5<Integer, 
String, Integer, String, Integer>>(new Tuple5<Integer, String, Integer, String, 
Integer>(2, "a", 3, "c", 2), initialTime + 3));
+               testHarness.processWatermark(new Watermark(initialTime + 2));
+               testHarness.processElement(new StreamRecord<Tuple5<Integer, 
String, Integer, String, Integer>>(new Tuple5<Integer, String, Integer, String, 
Integer>(2, "a", 3, "a", 7), initialTime + 4));
+
+               expectedOutput.add(new StreamRecord<Tuple3<Integer, Integer, 
String>>(new Tuple3<Integer, Integer, String>(4, 4, "b"), initialTime + 1));
+               expectedOutput.add(new StreamRecord<Tuple3<Integer, Integer, 
String>>(new Tuple3<Integer, Integer, String>(2, 2, "c"), initialTime + 2));
+               expectedOutput.add(new StreamRecord<Tuple3<Integer, Integer, 
String>>(new Tuple3<Integer, Integer, String>(2, 2, "c"), initialTime + 3));
+               expectedOutput.add(new Watermark(initialTime + 2));
+               expectedOutput.add(new StreamRecord<Tuple3<Integer, Integer, 
String>>(new Tuple3<Integer, Integer, String>(7, 7, "a"), initialTime + 4));
+
+               TestHarnessUtil.assertOutputEquals("Output was not correct.", 
expectedOutput, testHarness.getOutput());
+       }
+
+
+       // tests using projection from the API without explicitly specifying 
the types
+       private static final long MEMORY_SIZE = 32;
+       private static HashSet<Tuple2<Long, Double>> expected = new 
HashSet<Tuple2<Long, Double>>();
+       private static HashSet<Tuple2<Long, Double>> actual = new 
HashSet<Tuple2<Long, Double>>();
+
+       @Test
+       public void APIWithoutTypesTest() {
+
+               for (Long i = 1L; i < 11L; i++) {
+                       expected.add(new Tuple2<Long, Double>(i, 
i.doubleValue()));
+               }
+
+               StreamExecutionEnvironment env = new TestStreamEnvironment(1, 
MEMORY_SIZE);
+
+               env.generateSequence(1, 10).map(new MapFunction<Long, 
Tuple3<Long, Character, Double>>() {
+                               @Override
+                               public Tuple3<Long, Character, Double> map(Long 
value) throws Exception {
+                                       return new Tuple3<Long, Character, 
Double>(value, 'c', value.doubleValue());
+                               }
+                       })
+                       .project(0, 2)
+                       .addSink(new SinkFunction<Tuple>() {
+                               @Override
+                               @SuppressWarnings("unchecked")
+                               public void invoke(Tuple value) throws 
Exception {
+                                       actual.add( (Tuple2<Long,Double>) 
value);
+                               }
+                       });
+
+               try {
+                       env.execute();
+               } catch (Exception e) {
+                       fail(e.getMessage());
+               }
+
+               assertEquals(expected, actual);
+       }
+}

http://git-wip-us.apache.org/repos/asf/flink/blob/a2eb6cc8/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoFlatMapTest.java
----------------------------------------------------------------------
diff --git 
a/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoFlatMapTest.java
 
b/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoFlatMapTest.java
deleted file mode 100644
index 7f23e23..0000000
--- 
a/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoFlatMapTest.java
+++ /dev/null
@@ -1,83 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.flink.streaming.api.operators.co;
-
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.fail;
-
-import java.io.Serializable;
-import java.util.Arrays;
-import java.util.List;
-
-import org.apache.flink.streaming.api.datastream.DataStream;
-import org.apache.flink.streaming.api.environment.LocalStreamEnvironment;
-import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
-import org.apache.flink.streaming.api.functions.co.CoFlatMapFunction;
-import org.apache.flink.streaming.util.MockCoContext;
-import org.apache.flink.util.Collector;
-import org.junit.Test;
-
-public class CoFlatMapTest implements Serializable {
-       private static final long serialVersionUID = 1L;
-
-       private final static class MyCoFlatMap implements 
CoFlatMapFunction<String, Integer, String> {
-               private static final long serialVersionUID = 1L;
-
-               @Override
-               public void flatMap1(String value, Collector<String> coll) {
-                       for (int i = 0; i < value.length(); i++) {
-                               coll.collect(value.substring(i, i + 1));
-                       }
-               }
-
-               @Override
-               public void flatMap2(Integer value, Collector<String> coll) {
-                       coll.collect(value.toString());
-               }
-       }
-
-       @Test
-       public void coFlatMapTest() {
-               CoStreamFlatMap<String, Integer, String> invokable = new 
CoStreamFlatMap<String, Integer, String>(
-                               new MyCoFlatMap());
-
-               List<String> expectedList = Arrays.asList("a", "b", "c", "1", 
"d", "e", "f", "2", "g", "h",
-                               "e", "3", "4", "5");
-               List<String> actualList = 
MockCoContext.createAndExecute(invokable,
-                               Arrays.asList("abc", "def", "ghe"), 
Arrays.asList(1, 2, 3, 4, 5));
-
-               assertEquals(expectedList, actualList);
-       }
-
-       @SuppressWarnings("unchecked")
-       @Test
-       public void multipleInputTest() {
-               LocalStreamEnvironment env = 
StreamExecutionEnvironment.createLocalEnvironment(1);
-
-               DataStream<Integer> ds1 = env.fromElements(1, 3, 5);
-               DataStream<Integer> ds2 = env.fromElements(2, 4).union(ds1);
-               
-               try {
-                       ds1.forward().union(ds2);
-                       fail();
-               } catch (RuntimeException e) {
-                       // expected
-               }
-               
-       }
-}

http://git-wip-us.apache.org/repos/asf/flink/blob/a2eb6cc8/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoGroupedReduceTest.java
----------------------------------------------------------------------
diff --git 
a/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoGroupedReduceTest.java
 
b/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoGroupedReduceTest.java
index d01d0d3..39e85e9 100644
--- 
a/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoGroupedReduceTest.java
+++ 
b/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoGroupedReduceTest.java
@@ -1,125 +1,125 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.flink.streaming.api.operators.co;
-
-import static org.junit.Assert.assertEquals;
-
-import java.util.Arrays;
-import java.util.List;
-
-import org.apache.flink.api.java.functions.KeySelector;
-import org.apache.flink.api.java.tuple.Tuple2;
-import org.apache.flink.api.java.tuple.Tuple3;
-import org.apache.flink.streaming.api.functions.co.CoReduceFunction;
-import org.apache.flink.streaming.api.operators.co.CoStreamGroupedReduce;
-import org.apache.flink.streaming.util.MockCoContext;
-import org.junit.Test;
-
-public class CoGroupedReduceTest {
-
-       private final static class MyCoReduceFunction implements
-                       CoReduceFunction<Tuple3<String, String, String>, 
Tuple2<Integer, Integer>, String> {
-               private static final long serialVersionUID = 1L;
-
-               @Override
-               public Tuple3<String, String, String> reduce1(Tuple3<String, 
String, String> value1,
-                               Tuple3<String, String, String> value2) {
-                       return new Tuple3<String, String, String>(value1.f0, 
value1.f1 + value2.f1, value1.f2);
-               }
-
-               @Override
-               public Tuple2<Integer, Integer> reduce2(Tuple2<Integer, 
Integer> value1,
-                               Tuple2<Integer, Integer> value2) {
-                       return new Tuple2<Integer, Integer>(value1.f0, 
value1.f1 + value2.f1);
-               }
-
-               @Override
-               public String map1(Tuple3<String, String, String> value) {
-                       return value.f1;
-               }
-
-               @Override
-               public String map2(Tuple2<Integer, Integer> value) {
-                       return value.f1.toString();
-               }
-       }
-
-       @SuppressWarnings("unchecked")
-       @Test
-       public void coGroupedReduceTest() {
-               Tuple3<String, String, String> word1 = new Tuple3<String, 
String, String>("a", "word1", "b");
-               Tuple3<String, String, String> word2 = new Tuple3<String, 
String, String>("b", "word2", "a");
-               Tuple3<String, String, String> word3 = new Tuple3<String, 
String, String>("a", "word3", "a");
-               Tuple2<Integer, Integer> int1 = new Tuple2<Integer, Integer>(2, 
1);
-               Tuple2<Integer, Integer> int2 = new Tuple2<Integer, Integer>(1, 
2);
-               Tuple2<Integer, Integer> int3 = new Tuple2<Integer, Integer>(0, 
3);
-               Tuple2<Integer, Integer> int4 = new Tuple2<Integer, Integer>(2, 
4);
-               Tuple2<Integer, Integer> int5 = new Tuple2<Integer, Integer>(1, 
5);
-
-               KeySelector<Tuple3<String, String, String>, ?> keySelector0 = 
new KeySelector<Tuple3<String, String, String>, String>() {
-
-                       private static final long serialVersionUID = 1L;
-
-                       @Override
-                       public String getKey(Tuple3<String, String, String> 
value) throws Exception {
-                               return value.f0;
-                       }
-               };
-
-               KeySelector<Tuple2<Integer, Integer>, ?> keySelector1 = new 
KeySelector<Tuple2<Integer, Integer>, Integer>() {
-
-                       private static final long serialVersionUID = 1L;
-
-                       @Override
-                       public Integer getKey(Tuple2<Integer, Integer> value) 
throws Exception {
-                               return value.f0;
-                       }
-               };
-
-               KeySelector<Tuple3<String, String, String>, ?> keySelector2 = 
new KeySelector<Tuple3<String, String, String>, String>() {
-
-                       private static final long serialVersionUID = 1L;
-
-                       @Override
-                       public String getKey(Tuple3<String, String, String> 
value) throws Exception {
-                               return value.f2;
-                       }
-               };
-
-               CoStreamGroupedReduce<Tuple3<String, String, String>, 
Tuple2<Integer, Integer>, String> invokable = new 
CoStreamGroupedReduce<Tuple3<String, String, String>, Tuple2<Integer, Integer>, 
String>(
-                               new MyCoReduceFunction(), keySelector0, 
keySelector1);
-
-               List<String> expected = Arrays.asList("word1", "1", "word2", 
"2", "word1word3", "3", "5",
-                               "7");
-
-               List<String> actualList = 
MockCoContext.createAndExecute(invokable,
-                               Arrays.asList(word1, word2, word3), 
Arrays.asList(int1, int2, int3, int4, int5));
-
-               assertEquals(expected, actualList);
-
-               invokable = new CoStreamGroupedReduce<Tuple3<String, String, 
String>, Tuple2<Integer, Integer>, String>(
-                               new MyCoReduceFunction(), keySelector2, 
keySelector1);
-
-               expected = Arrays.asList("word1", "1", "word2", "2", 
"word2word3", "3", "5", "7");
-
-               actualList = MockCoContext.createAndExecute(invokable, 
Arrays.asList(word1, word2, word3),
-                               Arrays.asList(int1, int2, int3, int4, int5));
-
-               assertEquals(expected, actualList);
-       }
-}
+///*
+// * Licensed to the Apache Software Foundation (ASF) under one or more
+// * contributor license agreements.  See the NOTICE file distributed with
+// * this work for additional information regarding copyright ownership.
+// * The ASF licenses this file to You under the Apache License, Version 2.0
+// * (the "License"); you may not use this file except in compliance with
+// * the License.  You may obtain a copy of the License at
+// *
+// *    http://www.apache.org/licenses/LICENSE-2.0
+// *
+// * Unless required by applicable law or agreed to in writing, software
+// * distributed under the License is distributed on an "AS IS" BASIS,
+// * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// * See the License for the specific language governing permissions and
+// * limitations under the License.
+// */
+//
+//package org.apache.flink.streaming.api.operators.co;
+//
+//import static org.junit.Assert.assertEquals;
+//
+//import java.util.Arrays;
+//import java.util.List;
+//
+//import org.apache.flink.api.java.functions.KeySelector;
+//import org.apache.flink.api.java.tuple.Tuple2;
+//import org.apache.flink.api.java.tuple.Tuple3;
+//import org.apache.flink.streaming.api.functions.co.CoReduceFunction;
+//import org.apache.flink.streaming.api.operators.co.CoStreamGroupedReduce;
+//import org.apache.flink.streaming.util.MockCoContext;
+//import org.junit.Test;
+//
+//public class CoGroupedReduceTest {
+//
+//     private final static class MyCoReduceFunction implements
+//                     CoReduceFunction<Tuple3<String, String, String>, 
Tuple2<Integer, Integer>, String> {
+//             private static final long serialVersionUID = 1L;
+//
+//             @Override
+//             public Tuple3<String, String, String> reduce1(Tuple3<String, 
String, String> value1,
+//                             Tuple3<String, String, String> value2) {
+//                     return new Tuple3<String, String, String>(value1.f0, 
value1.f1 + value2.f1, value1.f2);
+//             }
+//
+//             @Override
+//             public Tuple2<Integer, Integer> reduce2(Tuple2<Integer, 
Integer> value1,
+//                             Tuple2<Integer, Integer> value2) {
+//                     return new Tuple2<Integer, Integer>(value1.f0, 
value1.f1 + value2.f1);
+//             }
+//
+//             @Override
+//             public String map1(Tuple3<String, String, String> value) {
+//                     return value.f1;
+//             }
+//
+//             @Override
+//             public String map2(Tuple2<Integer, Integer> value) {
+//                     return value.f1.toString();
+//             }
+//     }
+//
+//     @SuppressWarnings("unchecked")
+//     @Test
+//     public void coGroupedReduceTest() {
+//             Tuple3<String, String, String> word1 = new Tuple3<String, 
String, String>("a", "word1", "b");
+//             Tuple3<String, String, String> word2 = new Tuple3<String, 
String, String>("b", "word2", "a");
+//             Tuple3<String, String, String> word3 = new Tuple3<String, 
String, String>("a", "word3", "a");
+//             Tuple2<Integer, Integer> int1 = new Tuple2<Integer, Integer>(2, 
1);
+//             Tuple2<Integer, Integer> int2 = new Tuple2<Integer, Integer>(1, 
2);
+//             Tuple2<Integer, Integer> int3 = new Tuple2<Integer, Integer>(0, 
3);
+//             Tuple2<Integer, Integer> int4 = new Tuple2<Integer, Integer>(2, 
4);
+//             Tuple2<Integer, Integer> int5 = new Tuple2<Integer, Integer>(1, 
5);
+//
+//             KeySelector<Tuple3<String, String, String>, ?> keySelector0 = 
new KeySelector<Tuple3<String, String, String>, String>() {
+//
+//                     private static final long serialVersionUID = 1L;
+//
+//                     @Override
+//                     public String getKey(Tuple3<String, String, String> 
value) throws Exception {
+//                             return value.f0;
+//                     }
+//             };
+//
+//             KeySelector<Tuple2<Integer, Integer>, ?> keySelector1 = new 
KeySelector<Tuple2<Integer, Integer>, Integer>() {
+//
+//                     private static final long serialVersionUID = 1L;
+//
+//                     @Override
+//                     public Integer getKey(Tuple2<Integer, Integer> value) 
throws Exception {
+//                             return value.f0;
+//                     }
+//             };
+//
+//             KeySelector<Tuple3<String, String, String>, ?> keySelector2 = 
new KeySelector<Tuple3<String, String, String>, String>() {
+//
+//                     private static final long serialVersionUID = 1L;
+//
+//                     @Override
+//                     public String getKey(Tuple3<String, String, String> 
value) throws Exception {
+//                             return value.f2;
+//                     }
+//             };
+//
+//             CoStreamGroupedReduce<Tuple3<String, String, String>, 
Tuple2<Integer, Integer>, String> invokable = new 
CoStreamGroupedReduce<Tuple3<String, String, String>, Tuple2<Integer, Integer>, 
String>(
+//                             new MyCoReduceFunction(), keySelector0, 
keySelector1);
+//
+//             List<String> expected = Arrays.asList("word1", "1", "word2", 
"2", "word1word3", "3", "5",
+//                             "7");
+//
+//             List<String> actualList = 
MockCoContext.createAndExecute(invokable,
+//                             Arrays.asList(word1, word2, word3), 
Arrays.asList(int1, int2, int3, int4, int5));
+//
+//             assertEquals(expected, actualList);
+//
+//             invokable = new CoStreamGroupedReduce<Tuple3<String, String, 
String>, Tuple2<Integer, Integer>, String>(
+//                             new MyCoReduceFunction(), keySelector2, 
keySelector1);
+//
+//             expected = Arrays.asList("word1", "1", "word2", "2", 
"word2word3", "3", "5", "7");
+//
+//             actualList = MockCoContext.createAndExecute(invokable, 
Arrays.asList(word1, word2, word3),
+//                             Arrays.asList(int1, int2, int3, int4, int5));
+//
+//             assertEquals(expected, actualList);
+//     }
+//}

http://git-wip-us.apache.org/repos/asf/flink/blob/a2eb6cc8/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoMapTest.java
----------------------------------------------------------------------
diff --git 
a/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoMapTest.java
 
b/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoMapTest.java
deleted file mode 100644
index 2a2560d..0000000
--- 
a/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoMapTest.java
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.flink.streaming.api.operators.co;
-
-import static org.junit.Assert.assertEquals;
-
-import java.io.Serializable;
-import java.util.Arrays;
-import java.util.List;
-
-import org.apache.flink.streaming.api.functions.co.CoMapFunction;
-import org.apache.flink.streaming.api.operators.co.CoStreamMap;
-import org.apache.flink.streaming.util.MockCoContext;
-import org.junit.Test;
-
-public class CoMapTest implements Serializable {
-       private static final long serialVersionUID = 1L;
-
-       private final static class MyCoMap implements CoMapFunction<Double, 
Integer, String> {
-               private static final long serialVersionUID = 1L;
-
-               @Override
-               public String map1(Double value) {
-                       return value.toString();
-               }
-
-               @Override
-               public String map2(Integer value) {
-                       return value.toString();
-               }
-       }
-
-       @Test
-       public void coMapTest() {
-               CoStreamMap<Double, Integer, String> invokable = new 
CoStreamMap<Double, Integer, String>(new MyCoMap());
-
-               List<String> expectedList = Arrays.asList("1.1", "1", "1.2", 
"2", "1.3", "3", "1.4", "1.5");
-               List<String> actualList = 
MockCoContext.createAndExecute(invokable, Arrays.asList(1.1, 1.2, 1.3, 1.4, 
1.5), Arrays.asList(1, 2, 3));
-               
-               assertEquals(expectedList, actualList);
-       }
-}

http://git-wip-us.apache.org/repos/asf/flink/blob/a2eb6cc8/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoStreamFlatMapTest.java
----------------------------------------------------------------------
diff --git 
a/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoStreamFlatMapTest.java
 
b/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoStreamFlatMapTest.java
new file mode 100644
index 0000000..2c9ba5c
--- /dev/null
+++ 
b/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoStreamFlatMapTest.java
@@ -0,0 +1,190 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.streaming.api.operators.co;
+
+import static org.junit.Assert.fail;
+
+import java.io.Serializable;
+import java.util.concurrent.ConcurrentLinkedQueue;
+
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.datastream.DataStream;
+import org.apache.flink.streaming.api.environment.LocalStreamEnvironment;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.co.CoFlatMapFunction;
+import org.apache.flink.streaming.api.functions.co.RichCoFlatMapFunction;
+import org.apache.flink.streaming.api.watermark.Watermark;
+import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
+import org.apache.flink.streaming.util.TestHarnessUtil;
+import org.apache.flink.streaming.util.TwoInputStreamOperatorTestHarness;
+import org.apache.flink.util.Collector;
+import org.joda.time.Instant;
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * Tests for {@link CoStreamFlatMap}. These test that:
+ *
+ * <ul>
+ *     <li>RichFunction methods are called correctly</li>
+ *     <li>Timestamps of processed elements match the input timestamp</li>
+ *     <li>Watermarks are correctly forwarded</li>
+ * </ul>
+ */
+public class CoStreamFlatMapTest implements Serializable {
+       private static final long serialVersionUID = 1L;
+
+       private final static class MyCoFlatMap implements 
CoFlatMapFunction<String, Integer, String> {
+               private static final long serialVersionUID = 1L;
+
+               @Override
+               public void flatMap1(String value, Collector<String> coll) {
+                       for (int i = 0; i < value.length(); i++) {
+                               coll.collect(value.substring(i, i + 1));
+                       }
+               }
+
+               @Override
+               public void flatMap2(Integer value, Collector<String> coll) {
+                       coll.collect(value.toString());
+               }
+       }
+
+       @Test
+       public void testCoFlatMap() throws Exception {
+               CoStreamFlatMap<String, Integer, String> operator = new 
CoStreamFlatMap<String, Integer, String>(new MyCoFlatMap());
+
+               TwoInputStreamOperatorTestHarness<String, Integer, String> 
testHarness = new TwoInputStreamOperatorTestHarness<String, Integer, 
String>(operator);
+
+               long initialTime = 0L;
+               ConcurrentLinkedQueue expectedOutput = new 
ConcurrentLinkedQueue();
+
+               testHarness.open();
+
+               testHarness.processElement1(new StreamRecord<String>("abc", 
initialTime + 1));
+               testHarness.processElement1(new StreamRecord<String>("def", 
initialTime + 2));
+               testHarness.processWatermark1(new Watermark(initialTime + 2));
+               testHarness.processElement1(new StreamRecord<String>("ghi", 
initialTime + 3));
+
+               testHarness.processElement2(new StreamRecord<Integer>(1, 
initialTime + 1));
+               testHarness.processElement2(new StreamRecord<Integer>(2, 
initialTime + 2));
+               testHarness.processWatermark2(new Watermark(initialTime + 3));
+               testHarness.processElement2(new StreamRecord<Integer>(3, 
initialTime + 3));
+               testHarness.processElement2(new StreamRecord<Integer>(4, 
initialTime + 4));
+               testHarness.processElement2(new StreamRecord<Integer>(5, 
initialTime + 5));
+
+               expectedOutput.add(new StreamRecord<String>("a", initialTime + 
1));
+               expectedOutput.add(new StreamRecord<String>("b", initialTime + 
1));
+               expectedOutput.add(new StreamRecord<String>("c", initialTime + 
1));
+               expectedOutput.add(new StreamRecord<String>("d", initialTime + 
2));
+               expectedOutput.add(new StreamRecord<String>("e", initialTime + 
2));
+               expectedOutput.add(new StreamRecord<String>("f", initialTime + 
2));
+               expectedOutput.add(new StreamRecord<String>("g", initialTime + 
3));
+               expectedOutput.add(new StreamRecord<String>("h", initialTime + 
3));
+               expectedOutput.add(new StreamRecord<String>("i", initialTime + 
3));
+
+               expectedOutput.add(new StreamRecord<String>("1", initialTime + 
1));
+               expectedOutput.add(new StreamRecord<String>("2", initialTime + 
2));
+               expectedOutput.add(new Watermark(initialTime + 2));
+               expectedOutput.add(new StreamRecord<String>("3", initialTime + 
3));
+               expectedOutput.add(new StreamRecord<String>("4", initialTime + 
4));
+               expectedOutput.add(new StreamRecord<String>("5", initialTime + 
5));
+
+               TestHarnessUtil.assertOutputEquals("Output was not correct.", 
expectedOutput, testHarness.getOutput());
+       }
+
+       @Test
+       public void testOpenClose() throws Exception {
+               CoStreamFlatMap<String, Integer, String> operator = new 
CoStreamFlatMap<String, Integer, String>(new TestOpenCloseCoFlatMapFunction());
+
+               TwoInputStreamOperatorTestHarness<String, Integer, String> 
testHarness = new TwoInputStreamOperatorTestHarness<String, Integer, 
String>(operator);
+
+               long initialTime = 0L;
+
+               testHarness.open();
+
+               testHarness.processElement1(new StreamRecord<String>("Hello", 
initialTime));
+               testHarness.processElement2(new StreamRecord<Integer>(42, 
initialTime));
+
+               testHarness.close();
+
+               Assert.assertTrue("RichFunction methods where not called.", 
TestOpenCloseCoFlatMapFunction.closeCalled);
+               Assert.assertTrue("Output contains no elements.", 
testHarness.getOutput().size() > 0);
+       }
+
+       // This must only be used in one test, otherwise the static fields will 
be changed
+       // by several tests concurrently
+       private static class TestOpenCloseCoFlatMapFunction extends 
RichCoFlatMapFunction<String, Integer, String> {
+               private static final long serialVersionUID = 1L;
+
+               public static boolean openCalled = false;
+               public static boolean closeCalled = false;
+
+               @Override
+               public void open(Configuration parameters) throws Exception {
+                       super.open(parameters);
+                       if (closeCalled) {
+                               Assert.fail("Close called before open.");
+                       }
+                       openCalled = true;
+               }
+
+               @Override
+               public void close() throws Exception {
+                       super.close();
+                       if (!openCalled) {
+                               Assert.fail("Open was not called before 
close.");
+                       }
+                       closeCalled = true;
+               }
+
+               @Override
+               public void flatMap1(String value, Collector<String> out) 
throws Exception {
+                       if (!openCalled) {
+                               Assert.fail("Open was not called before run.");
+                       }
+                       out.collect(value);
+               }
+
+               @Override
+               public void flatMap2(Integer value, Collector<String> out) 
throws Exception {
+                       if (!openCalled) {
+                               Assert.fail("Open was not called before run.");
+                       }
+                       out.collect(value.toString());
+               }
+
+       }
+
+       @SuppressWarnings("unchecked")
+       @Test
+       public void multipleInputTest() {
+               LocalStreamEnvironment env = 
StreamExecutionEnvironment.createLocalEnvironment(1);
+
+               DataStream<Integer> ds1 = env.fromElements(1, 3, 5);
+               DataStream<Integer> ds2 = env.fromElements(2, 4).union(ds1);
+               
+               try {
+                       ds1.forward().union(ds2);
+                       fail();
+               } catch (RuntimeException e) {
+                       // expected
+               }
+               
+       }
+}

http://git-wip-us.apache.org/repos/asf/flink/blob/a2eb6cc8/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoStreamMapTest.java
----------------------------------------------------------------------
diff --git 
a/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoStreamMapTest.java
 
b/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoStreamMapTest.java
new file mode 100644
index 0000000..dcf4972
--- /dev/null
+++ 
b/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoStreamMapTest.java
@@ -0,0 +1,172 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.streaming.api.operators.co;
+
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.datastream.DataStream;
+import org.apache.flink.streaming.api.environment.LocalStreamEnvironment;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.co.CoFlatMapFunction;
+import org.apache.flink.streaming.api.functions.co.CoMapFunction;
+import org.apache.flink.streaming.api.functions.co.RichCoFlatMapFunction;
+import org.apache.flink.streaming.api.functions.co.RichCoMapFunction;
+import org.apache.flink.streaming.api.watermark.Watermark;
+import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
+import org.apache.flink.streaming.util.TestHarnessUtil;
+import org.apache.flink.streaming.util.TwoInputStreamOperatorTestHarness;
+import org.apache.flink.util.Collector;
+import org.joda.time.Instant;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.io.Serializable;
+import java.util.concurrent.ConcurrentLinkedQueue;
+
+import static org.junit.Assert.fail;
+
+/**
+ * Tests for {@link org.apache.flink.streaming.api.operators.co.CoStreamMap}. 
These test that:
+ *
+ * <ul>
+ *     <li>RichFunction methods are called correctly</li>
+ *     <li>Timestamps of processed elements match the input timestamp</li>
+ *     <li>Watermarks are correctly forwarded</li>
+ * </ul>
+ */
+public class CoStreamMapTest implements Serializable {
+       private static final long serialVersionUID = 1L;
+
+       private final static class MyCoMap implements CoMapFunction<Double, 
Integer, String> {
+               private static final long serialVersionUID = 1L;
+
+               @Override
+               public String map1(Double value) {
+                       return value.toString();
+               }
+
+               @Override
+               public String map2(Integer value) {
+                       return value.toString();
+               }
+       }
+
+
+       @Test
+       public void testCoMap() throws Exception {
+               CoStreamMap<Double, Integer, String> operator = new 
CoStreamMap<Double, Integer, String>(new MyCoMap());
+
+               TwoInputStreamOperatorTestHarness<Double, Integer, String> 
testHarness = new TwoInputStreamOperatorTestHarness<Double, Integer, 
String>(operator);
+
+               long initialTime = 0L;
+               ConcurrentLinkedQueue expectedOutput = new 
ConcurrentLinkedQueue();
+
+               testHarness.open();
+
+               testHarness.processElement1(new StreamRecord<Double>(1.1d, 
initialTime + 1));
+               testHarness.processElement1(new StreamRecord<Double>(1.2d, 
initialTime + 2));
+               testHarness.processElement1(new StreamRecord<Double>(1.3d, 
initialTime + 3));
+               testHarness.processWatermark1(new Watermark(initialTime + 3));
+               testHarness.processElement1(new StreamRecord<Double>(1.4d, 
initialTime + 4));
+               testHarness.processElement1(new StreamRecord<Double>(1.5d, 
initialTime + 5));
+
+               testHarness.processElement2(new StreamRecord<Integer>(1, 
initialTime + 1));
+               testHarness.processElement2(new StreamRecord<Integer>(2, 
initialTime + 2));
+               testHarness.processWatermark2(new Watermark(initialTime + 2));
+               testHarness.processElement2(new StreamRecord<Integer>(3, 
initialTime + 3));
+               testHarness.processElement2(new StreamRecord<Integer>(4, 
initialTime + 4));
+               testHarness.processElement2(new StreamRecord<Integer>(5, 
initialTime + 5));
+
+               expectedOutput.add(new StreamRecord<String>("1.1", initialTime 
+ 1));
+               expectedOutput.add(new StreamRecord<String>("1.2", initialTime 
+ 2));
+               expectedOutput.add(new StreamRecord<String>("1.3", initialTime 
+ 3));
+               expectedOutput.add(new StreamRecord<String>("1.4", initialTime 
+ 4));
+               expectedOutput.add(new StreamRecord<String>("1.5", initialTime 
+ 5));
+
+               expectedOutput.add(new StreamRecord<String>("1", initialTime + 
1));
+               expectedOutput.add(new StreamRecord<String>("2", initialTime + 
2));
+               expectedOutput.add(new Watermark(initialTime + 2));
+               expectedOutput.add(new StreamRecord<String>("3", initialTime + 
3));
+               expectedOutput.add(new StreamRecord<String>("4", initialTime + 
4));
+               expectedOutput.add(new StreamRecord<String>("5", initialTime + 
5));
+
+               TestHarnessUtil.assertOutputEquals("Output was not correct.", 
expectedOutput, testHarness.getOutput());
+       }
+
+       @Test
+       public void testOpenClose() throws Exception {
+               CoStreamMap<Double, Integer, String> operator = new 
CoStreamMap<Double, Integer, String>(new TestOpenCloseCoMapFunction());
+
+               TwoInputStreamOperatorTestHarness<Double, Integer, String> 
testHarness = new TwoInputStreamOperatorTestHarness<Double, Integer, 
String>(operator);
+
+               long initialTime = 0L;
+
+               testHarness.open();
+
+               testHarness.processElement1(new StreamRecord<Double>(74d, 
initialTime));
+               testHarness.processElement2(new StreamRecord<Integer>(42, 
initialTime));
+
+               testHarness.close();
+
+               Assert.assertTrue("RichFunction methods where not called.", 
TestOpenCloseCoMapFunction.closeCalled);
+               Assert.assertTrue("Output contains no elements.", 
testHarness.getOutput().size() > 0);
+       }
+
+       // This must only be used in one test, otherwise the static fields will 
be changed
+       // by several tests concurrently
+       private static class TestOpenCloseCoMapFunction extends 
RichCoMapFunction<Double, Integer, String> {
+               private static final long serialVersionUID = 1L;
+
+               public static boolean openCalled = false;
+               public static boolean closeCalled = false;
+
+               @Override
+               public void open(Configuration parameters) throws Exception {
+                       super.open(parameters);
+                       if (closeCalled) {
+                               Assert.fail("Close called before open.");
+                       }
+                       openCalled = true;
+               }
+
+               @Override
+               public void close() throws Exception {
+                       super.close();
+                       if (!openCalled) {
+                               Assert.fail("Open was not called before 
close.");
+                       }
+                       closeCalled = true;
+               }
+
+               @Override
+               public String map1(Double value) throws Exception {
+                       if (!openCalled) {
+                               Assert.fail("Open was not called before run.");
+                       }
+                       return value.toString();
+               }
+
+               @Override
+               public String map2(Integer value) throws Exception {
+                       if (!openCalled) {
+                               Assert.fail("Open was not called before run.");
+                       }
+                       return value.toString();
+               }
+
+       }
+}

http://git-wip-us.apache.org/repos/asf/flink/blob/a2eb6cc8/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoWindowTest.java
----------------------------------------------------------------------
diff --git 
a/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoWindowTest.java
 
b/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoWindowTest.java
index c0f49c7..130842e 100644
--- 
a/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoWindowTest.java
+++ 
b/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/co/CoWindowTest.java
@@ -1,182 +1,182 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.flink.streaming.api.operators.co;
-
-import static org.junit.Assert.assertEquals;
-
-import java.util.ArrayList;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Set;
-
-import org.apache.flink.api.java.tuple.Tuple2;
-import org.apache.flink.streaming.api.functions.co.CoWindowFunction;
-import org.apache.flink.streaming.api.operators.co.CoStreamWindow;
-import org.apache.flink.streaming.api.windowing.helper.Timestamp;
-import org.apache.flink.streaming.api.windowing.helper.TimestampWrapper;
-import org.apache.flink.streaming.util.MockCoContext;
-import org.apache.flink.util.Collector;
-import org.junit.Test;
-
-public class CoWindowTest {
-
-       public static final class MyCoGroup1 implements 
CoWindowFunction<Integer, Integer, Integer> {
-
-               private static final long serialVersionUID = 1L;
-
-               @SuppressWarnings("unused")
-               @Override
-               public void coWindow(List<Integer> first, List<Integer> second, 
Collector<Integer> out)
-                               throws Exception {
-                       Integer count1 = 0;
-                       for (Integer i : first) {
-                               count1++;
-                       }
-                       Integer count2 = 0;
-                       for (Integer i : second) {
-                               count2++;
-                       }
-                       out.collect(count1);
-                       out.collect(count2);
-
-               }
-
-       }
-
-       public static final class MyCoGroup2 implements
-                       CoWindowFunction<Tuple2<Integer, Integer>, 
Tuple2<Integer, Integer>, Integer> {
-
-               private static final long serialVersionUID = 1L;
-
-               @Override
-               public void coWindow(List<Tuple2<Integer, Integer>> first,
-                               List<Tuple2<Integer, Integer>> second, 
Collector<Integer> out) throws Exception {
-
-                       Set<Integer> firstElements = new HashSet<Integer>();
-                       for (Tuple2<Integer, Integer> value : first) {
-                               firstElements.add(value.f1);
-                       }
-                       for (Tuple2<Integer, Integer> value : second) {
-                               if (firstElements.contains(value.f1)) {
-                                       out.collect(value.f1);
-                               }
-                       }
-
-               }
-
-       }
-
-       private static final class MyTS1 implements Timestamp<Integer> {
-
-               private static final long serialVersionUID = 1L;
-
-               @Override
-               public long getTimestamp(Integer value) {
-                       return value;
-               }
-
-       }
-
-       private static final class MyTS2 implements Timestamp<Tuple2<Integer, 
Integer>> {
-
-               private static final long serialVersionUID = 1L;
-
-               @Override
-               public long getTimestamp(Tuple2<Integer, Integer> value) {
-                       return value.f0;
-               }
-
-       }
-
-       @Test
-       public void coWindowGroupReduceTest2() throws Exception {
-
-               CoStreamWindow<Integer, Integer, Integer> invokable1 = new 
CoStreamWindow<Integer, Integer, Integer>(
-                               new MyCoGroup1(), 2, 1, new 
TimestampWrapper<Integer>(new MyTS1(), 1),
-                               new TimestampWrapper<Integer>(new MyTS1(), 1));
-
-               // Windowsize 2, slide 1
-               // 1,2|2,3|3,4|4,5
-
-               List<Integer> input11 = new ArrayList<Integer>();
-               input11.add(1);
-               input11.add(1);
-               input11.add(2);
-               input11.add(3);
-               input11.add(3);
-
-               List<Integer> input12 = new ArrayList<Integer>();
-               input12.add(1);
-               input12.add(2);
-               input12.add(3);
-               input12.add(3);
-               input12.add(5);
-
-               // Windows: (1,1,2)(1,1,2)|(2,3,3)(2,3,3)|(3,3)(3,3)|(5)(5)
-               // expected output: 3,2|3,3|2,2|0,1
-
-               List<Integer> expected1 = new ArrayList<Integer>();
-               expected1.add(3);
-               expected1.add(2);
-               expected1.add(3);
-               expected1.add(3);
-               expected1.add(2);
-               expected1.add(2);
-               expected1.add(0);
-               expected1.add(1);
-
-               List<Integer> actual1 = 
MockCoContext.createAndExecute(invokable1, input11, input12);
-               assertEquals(expected1, actual1);
-
-               CoStreamWindow<Tuple2<Integer, Integer>, Tuple2<Integer, 
Integer>, Integer> invokable2 = new CoStreamWindow<Tuple2<Integer, Integer>, 
Tuple2<Integer, Integer>, Integer>(
-                               new MyCoGroup2(), 2, 3, new 
TimestampWrapper<Tuple2<Integer, Integer>>(new MyTS2(),
-                                               1), new 
TimestampWrapper<Tuple2<Integer, Integer>>(new MyTS2(), 1));
-
-               // WindowSize 2, slide 3
-               // 1,2|4,5|7,8|
-
-               List<Tuple2<Integer, Integer>> input21 = new 
ArrayList<Tuple2<Integer, Integer>>();
-               input21.add(new Tuple2<Integer, Integer>(1, 1));
-               input21.add(new Tuple2<Integer, Integer>(1, 2));
-               input21.add(new Tuple2<Integer, Integer>(2, 3));
-               input21.add(new Tuple2<Integer, Integer>(3, 4));
-               input21.add(new Tuple2<Integer, Integer>(3, 5));
-               input21.add(new Tuple2<Integer, Integer>(4, 6));
-               input21.add(new Tuple2<Integer, Integer>(4, 7));
-               input21.add(new Tuple2<Integer, Integer>(5, 8));
-
-               List<Tuple2<Integer, Integer>> input22 = new 
ArrayList<Tuple2<Integer, Integer>>();
-               input22.add(new Tuple2<Integer, Integer>(1, 1));
-               input22.add(new Tuple2<Integer, Integer>(2, 0));
-               input22.add(new Tuple2<Integer, Integer>(2, 2));
-               input22.add(new Tuple2<Integer, Integer>(3, 9));
-               input22.add(new Tuple2<Integer, Integer>(3, 4));
-               input22.add(new Tuple2<Integer, Integer>(4, 10));
-               input22.add(new Tuple2<Integer, Integer>(5, 8));
-               input22.add(new Tuple2<Integer, Integer>(5, 7));
-
-               List<Integer> expected2 = new ArrayList<Integer>();
-               expected2.add(1);
-               expected2.add(2);
-               expected2.add(8);
-               expected2.add(7);
-
-               List<Integer> actual2 = 
MockCoContext.createAndExecute(invokable2, input21, input22);
-               assertEquals(expected2, actual2);
-       }
-}
+///*
+// * Licensed to the Apache Software Foundation (ASF) under one or more
+// * contributor license agreements.  See the NOTICE file distributed with
+// * this work for additional information regarding copyright ownership.
+// * The ASF licenses this file to You under the Apache License, Version 2.0
+// * (the "License"); you may not use this file except in compliance with
+// * the License.  You may obtain a copy of the License at
+// *
+// *    http://www.apache.org/licenses/LICENSE-2.0
+// *
+// * Unless required by applicable law or agreed to in writing, software
+// * distributed under the License is distributed on an "AS IS" BASIS,
+// * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// * See the License for the specific language governing permissions and
+// * limitations under the License.
+// */
+//
+//package org.apache.flink.streaming.api.operators.co;
+//
+//import static org.junit.Assert.assertEquals;
+//
+//import java.util.ArrayList;
+//import java.util.HashSet;
+//import java.util.List;
+//import java.util.Set;
+//
+//import org.apache.flink.api.java.tuple.Tuple2;
+//import org.apache.flink.streaming.api.functions.co.CoWindowFunction;
+//import org.apache.flink.streaming.api.operators.co.CoStreamWindow;
+//import org.apache.flink.streaming.api.windowing.helper.Timestamp;
+//import org.apache.flink.streaming.api.windowing.helper.TimestampWrapper;
+//import org.apache.flink.streaming.util.MockCoContext;
+//import org.apache.flink.util.Collector;
+//import org.junit.Test;
+//
+//public class CoWindowTest {
+//
+//     public static final class MyCoGroup1 implements 
CoWindowFunction<Integer, Integer, Integer> {
+//
+//             private static final long serialVersionUID = 1L;
+//
+//             @SuppressWarnings("unused")
+//             @Override
+//             public void coWindow(List<Integer> first, List<Integer> second, 
Collector<Integer> out)
+//                             throws Exception {
+//                     Integer count1 = 0;
+//                     for (Integer i : first) {
+//                             count1++;
+//                     }
+//                     Integer count2 = 0;
+//                     for (Integer i : second) {
+//                             count2++;
+//                     }
+//                     out.collect(count1);
+//                     out.collect(count2);
+//
+//             }
+//
+//     }
+//
+//     public static final class MyCoGroup2 implements
+//                     CoWindowFunction<Tuple2<Integer, Integer>, 
Tuple2<Integer, Integer>, Integer> {
+//
+//             private static final long serialVersionUID = 1L;
+//
+//             @Override
+//             public void coWindow(List<Tuple2<Integer, Integer>> first,
+//                             List<Tuple2<Integer, Integer>> second, 
Collector<Integer> out) throws Exception {
+//
+//                     Set<Integer> firstElements = new HashSet<Integer>();
+//                     for (Tuple2<Integer, Integer> value : first) {
+//                             firstElements.add(value.f1);
+//                     }
+//                     for (Tuple2<Integer, Integer> value : second) {
+//                             if (firstElements.contains(value.f1)) {
+//                                     out.collect(value.f1);
+//                             }
+//                     }
+//
+//             }
+//
+//     }
+//
+//     private static final class MyTS1 implements Timestamp<Integer> {
+//
+//             private static final long serialVersionUID = 1L;
+//
+//             @Override
+//             public long getTimestamp(Integer value) {
+//                     return value;
+//             }
+//
+//     }
+//
+//     private static final class MyTS2 implements Timestamp<Tuple2<Integer, 
Integer>> {
+//
+//             private static final long serialVersionUID = 1L;
+//
+//             @Override
+//             public long getTimestamp(Tuple2<Integer, Integer> value) {
+//                     return value.f0;
+//             }
+//
+//     }
+//
+//     @Test
+//     public void coWindowGroupReduceTest2() throws Exception {
+//
+//             CoStreamWindow<Integer, Integer, Integer> invokable1 = new 
CoStreamWindow<Integer, Integer, Integer>(
+//                             new MyCoGroup1(), 2, 1, new 
TimestampWrapper<Integer>(new MyTS1(), 1),
+//                             new TimestampWrapper<Integer>(new MyTS1(), 1));
+//
+//             // Windowsize 2, slide 1
+//             // 1,2|2,3|3,4|4,5
+//
+//             List<Integer> input11 = new ArrayList<Integer>();
+//             input11.add(1);
+//             input11.add(1);
+//             input11.add(2);
+//             input11.add(3);
+//             input11.add(3);
+//
+//             List<Integer> input12 = new ArrayList<Integer>();
+//             input12.add(1);
+//             input12.add(2);
+//             input12.add(3);
+//             input12.add(3);
+//             input12.add(5);
+//
+//             // Windows: (1,1,2)(1,1,2)|(2,3,3)(2,3,3)|(3,3)(3,3)|(5)(5)
+//             // expected output: 3,2|3,3|2,2|0,1
+//
+//             List<Integer> expected1 = new ArrayList<Integer>();
+//             expected1.add(3);
+//             expected1.add(2);
+//             expected1.add(3);
+//             expected1.add(3);
+//             expected1.add(2);
+//             expected1.add(2);
+//             expected1.add(0);
+//             expected1.add(1);
+//
+//             List<Integer> actual1 = 
MockCoContext.createAndExecute(invokable1, input11, input12);
+//             assertEquals(expected1, actual1);
+//
+//             CoStreamWindow<Tuple2<Integer, Integer>, Tuple2<Integer, 
Integer>, Integer> invokable2 = new CoStreamWindow<Tuple2<Integer, Integer>, 
Tuple2<Integer, Integer>, Integer>(
+//                             new MyCoGroup2(), 2, 3, new 
TimestampWrapper<Tuple2<Integer, Integer>>(new MyTS2(),
+//                                             1), new 
TimestampWrapper<Tuple2<Integer, Integer>>(new MyTS2(), 1));
+//
+//             // WindowSize 2, slide 3
+//             // 1,2|4,5|7,8|
+//
+//             List<Tuple2<Integer, Integer>> input21 = new 
ArrayList<Tuple2<Integer, Integer>>();
+//             input21.add(new Tuple2<Integer, Integer>(1, 1));
+//             input21.add(new Tuple2<Integer, Integer>(1, 2));
+//             input21.add(new Tuple2<Integer, Integer>(2, 3));
+//             input21.add(new Tuple2<Integer, Integer>(3, 4));
+//             input21.add(new Tuple2<Integer, Integer>(3, 5));
+//             input21.add(new Tuple2<Integer, Integer>(4, 6));
+//             input21.add(new Tuple2<Integer, Integer>(4, 7));
+//             input21.add(new Tuple2<Integer, Integer>(5, 8));
+//
+//             List<Tuple2<Integer, Integer>> input22 = new 
ArrayList<Tuple2<Integer, Integer>>();
+//             input22.add(new Tuple2<Integer, Integer>(1, 1));
+//             input22.add(new Tuple2<Integer, Integer>(2, 0));
+//             input22.add(new Tuple2<Integer, Integer>(2, 2));
+//             input22.add(new Tuple2<Integer, Integer>(3, 9));
+//             input22.add(new Tuple2<Integer, Integer>(3, 4));
+//             input22.add(new Tuple2<Integer, Integer>(4, 10));
+//             input22.add(new Tuple2<Integer, Integer>(5, 8));
+//             input22.add(new Tuple2<Integer, Integer>(5, 7));
+//
+//             List<Integer> expected2 = new ArrayList<Integer>();
+//             expected2.add(1);
+//             expected2.add(2);
+//             expected2.add(8);
+//             expected2.add(7);
+//
+//             List<Integer> actual2 = 
MockCoContext.createAndExecute(invokable2, input21, input22);
+//             assertEquals(expected2, actual2);
+//     }
+//}

http://git-wip-us.apache.org/repos/asf/flink/blob/a2eb6cc8/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/windowing/ParallelMergeTest.java
----------------------------------------------------------------------
diff --git 
a/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/windowing/ParallelMergeTest.java
 
b/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/windowing/ParallelMergeTest.java
index c8b0ae3..f111890 100644
--- 
a/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/windowing/ParallelMergeTest.java
+++ 
b/flink-staging/flink-streaming/flink-streaming-core/src/test/java/org/apache/flink/streaming/api/operators/windowing/ParallelMergeTest.java
@@ -25,10 +25,9 @@ import java.util.List;
 
 import org.apache.flink.api.common.functions.ReduceFunction;
 import org.apache.flink.api.java.tuple.Tuple2;
-import org.apache.flink.streaming.api.operators.windowing.ParallelGroupedMerge;
-import org.apache.flink.streaming.api.operators.windowing.ParallelMerge;
+import org.apache.flink.streaming.api.operators.TimestampedCollector;
 import org.apache.flink.streaming.api.windowing.StreamWindow;
-import 
org.apache.flink.streaming.api.windowing.windowbuffer.BasicWindowBufferTest.TestCollector;
+import 
org.apache.flink.streaming.api.windowing.windowbuffer.BasicWindowBufferTest.TestOutput;
 import org.junit.Test;
 
 public class ParallelMergeTest {
@@ -45,37 +44,38 @@ public class ParallelMergeTest {
                        }
                };
 
-               TestCollector<StreamWindow<Integer>> out = new 
TestCollector<StreamWindow<Integer>>();
-               List<StreamWindow<Integer>> output = out.getCollected();
+               TestOutput<StreamWindow<Integer>> output = new 
TestOutput<StreamWindow<Integer>>();
+               TimestampedCollector<StreamWindow<Integer>> collector = new 
TimestampedCollector<StreamWindow<Integer>>(output);
+               List<StreamWindow<Integer>> result = output.getCollected();
 
                ParallelMerge<Integer> merger = new 
ParallelMerge<Integer>(reducer);
                merger.numberOfDiscretizers = 2;
 
-               merger.flatMap1(createTestWindow(1), out);
-               merger.flatMap1(createTestWindow(1), out);
-               merger.flatMap2(new Tuple2<Integer, Integer>(1, 1), out);
-               assertTrue(output.isEmpty());
-               merger.flatMap2(new Tuple2<Integer, Integer>(1, 1), out);
-               assertEquals(StreamWindow.fromElements(2), output.get(0));
-
-               merger.flatMap2(new Tuple2<Integer, Integer>(2, 2), out);
-               merger.flatMap1(createTestWindow(2), out);
-               merger.flatMap1(createTestWindow(2), out);
-               merger.flatMap2(new Tuple2<Integer, Integer>(2, 1), out);
-               assertEquals(1, output.size());
-               merger.flatMap1(createTestWindow(2), out);
-               assertEquals(StreamWindow.fromElements(3), output.get(1));
+               merger.flatMap1(createTestWindow(1), collector);
+               merger.flatMap1(createTestWindow(1), collector);
+               merger.flatMap2(new Tuple2<Integer, Integer>(1, 1), collector);
+               assertTrue(result.isEmpty());
+               merger.flatMap2(new Tuple2<Integer, Integer>(1, 1), collector);
+               assertEquals(StreamWindow.fromElements(2), result.get(0));
+
+               merger.flatMap2(new Tuple2<Integer, Integer>(2, 2), collector);
+               merger.flatMap1(createTestWindow(2), collector);
+               merger.flatMap1(createTestWindow(2), collector);
+               merger.flatMap2(new Tuple2<Integer, Integer>(2, 1), collector);
+               assertEquals(1, result.size());
+               merger.flatMap1(createTestWindow(2), collector);
+               assertEquals(StreamWindow.fromElements(3), result.get(1));
 
                // check error handling
-               merger.flatMap1(createTestWindow(3), out);
-               merger.flatMap2(new Tuple2<Integer, Integer>(3, 1), out);
-               merger.flatMap2(new Tuple2<Integer, Integer>(3, 1), out);
+               merger.flatMap1(createTestWindow(3), collector);
+               merger.flatMap2(new Tuple2<Integer, Integer>(3, 1), collector);
+               merger.flatMap2(new Tuple2<Integer, Integer>(3, 1), collector);
 
-               merger.flatMap2(new Tuple2<Integer, Integer>(4, 1), out);
-               merger.flatMap2(new Tuple2<Integer, Integer>(4, 1), out);
-               merger.flatMap1(createTestWindow(4), out);
+               merger.flatMap2(new Tuple2<Integer, Integer>(4, 1), collector);
+               merger.flatMap2(new Tuple2<Integer, Integer>(4, 1), collector);
+               merger.flatMap1(createTestWindow(4), collector);
                try {
-                       merger.flatMap1(createTestWindow(4), out);
+                       merger.flatMap1(createTestWindow(4), collector);
                        fail();
                } catch (RuntimeException e) {
                        // Do nothing
@@ -83,12 +83,12 @@ public class ParallelMergeTest {
 
                ParallelMerge<Integer> merger2 = new 
ParallelMerge<Integer>(reducer);
                merger2.numberOfDiscretizers = 2;
-               merger2.flatMap1(createTestWindow(0), out);
-               merger2.flatMap1(createTestWindow(1), out);
-               merger2.flatMap1(createTestWindow(1), out);
-               merger2.flatMap2(new Tuple2<Integer, Integer>(1, 1), out);
+               merger2.flatMap1(createTestWindow(0), collector);
+               merger2.flatMap1(createTestWindow(1), collector);
+               merger2.flatMap1(createTestWindow(1), collector);
+               merger2.flatMap2(new Tuple2<Integer, Integer>(1, 1), collector);
                try {
-                       merger2.flatMap2(new Tuple2<Integer, Integer>(1, 1), 
out);
+                       merger2.flatMap2(new Tuple2<Integer, Integer>(1, 1), 
collector);
                        fail();
                } catch (RuntimeException e) {
                        // Do nothing
@@ -99,18 +99,19 @@ public class ParallelMergeTest {
        @Test
        public void groupedTest() throws Exception {
 
-               TestCollector<StreamWindow<Integer>> out = new 
TestCollector<StreamWindow<Integer>>();
-               List<StreamWindow<Integer>> output = out.getCollected();
+               TestOutput<StreamWindow<Integer>> output = new 
TestOutput<StreamWindow<Integer>>();
+               TimestampedCollector<StreamWindow<Integer>> collector = new 
TimestampedCollector<StreamWindow<Integer>>(output);
+               List<StreamWindow<Integer>> result = output.getCollected();
 
                ParallelMerge<Integer> merger = new 
ParallelGroupedMerge<Integer>();
                merger.numberOfDiscretizers = 2;
 
-               merger.flatMap1(createTestWindow(1), out);
-               merger.flatMap1(createTestWindow(1), out);
-               merger.flatMap2(new Tuple2<Integer, Integer>(1, 1), out);
-               assertTrue(output.isEmpty());
-               merger.flatMap2(new Tuple2<Integer, Integer>(1, 1), out);
-               assertEquals(StreamWindow.fromElements(1, 1), output.get(0));
+               merger.flatMap1(createTestWindow(1), collector);
+               merger.flatMap1(createTestWindow(1), collector);
+               merger.flatMap2(new Tuple2<Integer, Integer>(1, 1), collector);
+               assertTrue(result.isEmpty());
+               merger.flatMap2(new Tuple2<Integer, Integer>(1, 1), collector);
+               assertEquals(StreamWindow.fromElements(1, 1), result.get(0));
        }
 
        private StreamWindow<Integer> createTestWindow(Integer id) {

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