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背景

日常测试中我们使用flink的TestHarness只能测试单个算子，很多情况下我们需要集成测试来测试真正的问题，所以在flink中进行集成测试还是非常有必要的，本文就来记录下如何在flink中进行集成测试

flink中进行集成测试

flink中进行集成测试的关键类MiniClusterWithClientResource，这是一个启动本地flink集群的关键类，先看一下集成测试的关键代码：

/*** FLINK集成测试* https://nightlies.apache.org/flink/flink-docs-release-1.13/zh/docs/dev/datastream/testing/**/
public class FlinkIntegrationTest {public static final Configuration config = Configuration.fromMap(new HashMap<String, String>() {{put("heartbeat.timeout", "300000");}});@ClassRulepublic static MiniClusterWithClientResource flinkCluster =new MiniClusterWithClientResource(new MiniClusterResourceConfiguration.Builder().setConfiguration(config).setNumberSlotsPerTaskManager(1).setNumberTaskManagers(3).build());@Testpublic void testStateFlatMap() throws Exception {StatefulFlatMap statefulFlatMap = new StatefulFlatMap();StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();// configure your test environmentenv.setParallelism(2);// values are collected in a static variableCollectSink.values.clear();// create a stream of custom elements and apply transformationsenv.fromElements("world", "hi").keyBy(e -> "1").flatMap(statefulFlatMap).addSink(new CollectSink());// executeenv.execute();// verify your resultsassertTrue(CollectSink.values.containsAll(Lists.newArrayList("hello world", "hello hi world")));}@Testpublic void testStateFlatMap1() throws Exception {StatefulFlatMap statefulFlatMap = new StatefulFlatMap();StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();// configure your test environmentenv.setParallelism(2);// values are collected in a static variableCollectSink.values.clear();// create a stream of custom elements and apply transformationsenv.fromElements("world", "hi", "world").keyBy(e -> e).flatMap(statefulFlatMap).addSink(new CollectSink());// executeenv.execute();// verify your resultsassertTrue(CollectSink.values.containsAll(Lists.newArrayList("hello world", "hello hi", "hello world world")));}// create a testing sinkprivate static class CollectSink implements SinkFunction<String> {// must be staticpublic static final List<String> values = Collections.synchronizedList(new ArrayList<>());@Overridepublic void invoke(String value, Context context) throws Exception {values.add(value);}}}public class StatefulFlatMap extends RichFlatMapFunction<String, String> {ValueState<String> previousInput;@Overridepublic void open(Configuration parameters) throws Exception {previousInput = getRuntimeContext().getState(new ValueStateDescriptor<String>("previousInput", Types.STRING));}@Overridepublic void flatMap(String in, Collector<String> collector) throws Exception {String out = "hello " + in;if(previousInput.value() != null){out = out + " " + previousInput.value();}previousInput.update(in);collector.collect(out);}

由于我们是集成测试，我们一般输入source和输出sink是自己构造的，比如这里的CollectSink，这里就可以正常测试包括状态在内的pineline集成测试了