StreamIterationHeadTest.java

/*
 * 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
 *
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 * distributed under the License is distributed on an "AS IS" BASIS,
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package org.apache.flink.streaming.api.streamtask;

import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
import org.apache.flink.streaming.api.watermark.Watermark;
import org.apache.flink.streaming.runtime.tasks.StreamIterationHead;
import org.apache.flink.streaming.runtime.tasks.StreamTaskTestHarness;

import org.junit.Test;

import static org.junit.Assert.*;

public class StreamIterationHeadTest {

	@Test
	public void testIterationHeadWatermarkEmission() throws Exception {
		StreamIterationHead<Integer> head = new StreamIterationHead<>();
		StreamTaskTestHarness<Integer> harness = new StreamTaskTestHarness<>(head,
				BasicTypeInfo.INT_TYPE_INFO);
		harness.setupOutputForSingletonOperatorChain();
		harness.getStreamConfig().setIterationId("1");
		harness.getStreamConfig().setIterationWaitTime(1);

		harness.invoke();
		harness.waitForTaskCompletion();

		assertEquals(1, harness.getOutput().size());
		assertEquals(new Watermark(Long.MAX_VALUE), harness.getOutput().peek());
	}
}