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From: StefanRRichter <git@git.apache.org>
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Subject: [GitHub] flink pull request #2572: [FLINK-4552] Refactor WindowOperator/Trigger Tests
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Message-Id: <20161027153051.A5635DFAAB@git1-us-west.apache.org>
Date: Thu, 27 Oct 2016 15:30:51 +0000 (UTC)
archived-at: Thu, 27 Oct 2016 15:30:58 -0000

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

    https://github.com/apache/flink/pull/2572#discussion_r85359406
  
    --- Diff: flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/CountTriggerTest.java ---
    @@ -0,0 +1,123 @@
    +/*
    + * 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.runtime.operators.windowing;
    +
    +import com.google.common.collect.Lists;
    +import org.apache.flink.streaming.api.windowing.triggers.CountTrigger;
    +import org.apache.flink.streaming.api.windowing.triggers.TriggerResult;
    +import org.apache.flink.streaming.api.windowing.windows.TimeWindow;
    +import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
    +import org.junit.Test;
    +
    +import static org.junit.Assert.assertEquals;
    +
    +/**
    + * Tests for {@link CountTrigger}.
    + */
    +public class CountTriggerTest {
    +
    +	/**
    +	 * Verify that state of separate windows does not leak into other windows.
    +	 */
    +	@Test
    +	public void testWindowSeparationAndFiring() throws Exception {
    +		TriggerTestHarness<Object, TimeWindow> testHarness =
    +				new TriggerTestHarness<>(CountTrigger.<TimeWindow>of(3), new TimeWindow.Serializer());
    +
    +		assertEquals(TriggerResult.CONTINUE, testHarness.processElement(new StreamRecord<Object>(1), new TimeWindow(0, 2)));
    +		assertEquals(TriggerResult.CONTINUE, testHarness.processElement(new StreamRecord<Object>(1), new TimeWindow(2, 4)));
    +
    +		// shouldn't have any timers
    +		assertEquals(0, testHarness.numProcessingTimeTimers());
    +		assertEquals(0, testHarness.numEventTimeTimers());
    +
    +		assertEquals(2, testHarness.numStateEntries());
    +		assertEquals(1, testHarness.numStateEntries(new TimeWindow(0, 2)));
    +		assertEquals(1, testHarness.numStateEntries(new TimeWindow(2, 4)));
    +
    +		assertEquals(TriggerResult.CONTINUE, testHarness.processElement(new StreamRecord<Object>(1), new TimeWindow(0, 2)));
    +		assertEquals(TriggerResult.FIRE, testHarness.processElement(new StreamRecord<Object>(1), new TimeWindow(0, 2)));
    +		assertEquals(TriggerResult.CONTINUE, testHarness.processElement(new StreamRecord<Object>(1), new TimeWindow(2, 4)));
    +
    +		// right now, CountTrigger will clear it's state in onElement when firing
    +		// ideally, this should be moved to onFire()
    +		assertEquals(1, testHarness.numStateEntries());
    +		assertEquals(0, testHarness.numStateEntries(new TimeWindow(0, 2)));
    +		assertEquals(1, testHarness.numStateEntries(new TimeWindow(2, 4)));
    +	}
    --- End diff --
    
    You could also let W(2,4) fire for completeness, so that the count was not reset by the previous firing.


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