Github user aljoscha commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5439#discussion_r167197709
  
    --- Diff: 
flink-contrib/flink-streaming-contrib/src/test/java/org/apache/flink/contrib/streaming/ReinterpretAsKeyedStreamITCase.java
 ---
    @@ -0,0 +1,235 @@
    +/*
    + * 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.contrib.streaming;
    +
    +import org.apache.flink.api.common.functions.ReduceFunction;
    +import org.apache.flink.api.common.typeinfo.TypeInformation;
    +import org.apache.flink.api.java.functions.KeySelector;
    +import org.apache.flink.api.java.tuple.Tuple2;
    +import org.apache.flink.configuration.Configuration;
    +import org.apache.flink.streaming.api.TimeCharacteristic;
    +import org.apache.flink.streaming.api.datastream.DataStream;
    +import 
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
    +import org.apache.flink.streaming.api.functions.sink.RichSinkFunction;
    +import 
org.apache.flink.streaming.api.functions.source.ParallelSourceFunction;
    +import 
org.apache.flink.streaming.api.functions.source.RichParallelSourceFunction;
    +import org.apache.flink.streaming.api.windowing.time.Time;
    +import org.apache.flink.util.Preconditions;
    +
    +import org.junit.Assert;
    +import org.junit.Rule;
    +import org.junit.Test;
    +import org.junit.rules.TemporaryFolder;
    +
    +import java.io.BufferedInputStream;
    +import java.io.BufferedOutputStream;
    +import java.io.DataInputStream;
    +import java.io.DataOutputStream;
    +import java.io.EOFException;
    +import java.io.File;
    +import java.io.FileInputStream;
    +import java.io.FileOutputStream;
    +import java.util.ArrayList;
    +import java.util.List;
    +import java.util.Random;
    +
    +/**
    + * ITCase for {@link DataStreamUtils#reinterpretAsKeyedStream(DataStream, 
KeySelector)}.
    + */
    +public class ReinterpretAsKeyedStreamITCase {
    +
    +   @Rule
    +   public TemporaryFolder temporaryFolder = new TemporaryFolder();
    +
    +   /**
    +    * FLINK-8571
    --- End diff --
    
    @StefanRRichter Yes, this can then probably also be removed from the 
original PR before merging.


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