Github user zentol commented on a diff in the pull request: https://github.com/apache/flink/pull/5977#discussion_r187250723 --- Diff: flink-streaming-java/src/test/java/org/apache/flink/streaming/util/MockStreamConfig.java --- @@ -0,0 +1,35 @@ +/* + * 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.util; + +import org.apache.flink.api.common.typeutils.base.IntSerializer; +import org.apache.flink.configuration.Configuration; +import org.apache.flink.runtime.jobgraph.OperatorID; +import org.apache.flink.streaming.api.graph.StreamConfig; + +/** + * Handy mock for {@link StreamConfig}. + */ +public class MockStreamConfig extends StreamConfig { + public MockStreamConfig() { + super(new Configuration()); + + setTypeSerializerIn1(IntSerializer.INSTANCE); --- End diff -- not sure about this one. I would expect a `MockStreamConfig` to be generally usable, but this one can mess things up in regards to serializers. I'd just remove the mocking and replace it with ``` StreamConfig streamConfig = new StreamConfig(); streamConfig.setTypeSerializerIn1(IntSerializer.INSTANCE); ```
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