/* * 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.test.streaming.experimental; import org.apache.flink.streaming.api.datastream.DataStream; import org.apache.flink.streaming.api.datastream.DataStreamUtils; import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; import org.apache.flink.test.util.AbstractTestBase; import org.junit.Test; import java.util.Iterator; import static org.junit.Assert.assertEquals; /** * This test verifies the behavior of DataStreamUtils.collect(). * * <p>This experimental class is relocated from flink-streaming-contrib. Please see package-info.java * for more information. */ public class CollectITCase extends AbstractTestBase { @Test public void testCollect() throws Exception { final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(); env.setParallelism(1); final long n = 10; DataStream<Long> stream = env.generateSequence(1, n); long i = 1; for (Iterator<Long> it = DataStreamUtils.collect(stream); it.hasNext(); ) { long x = it.next(); assertEquals("received wrong element", i, x); i++; } assertEquals("received wrong number of elements", n + 1, i); } }