library/src/test/java/com/datatorrent/lib/algo/UniqueValueCountTest.java

/*
 * Copyright (c) 2013 DataTorrent, Inc. ALL Rights Reserved.
 *
 * Licensed 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 com.datatorrent.lib.algo;

import org.junit.Assert;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.collect.ImmutableMap;

import com.datatorrent.lib.testbench.CollectorTestSink;
import com.datatorrent.lib.util.KeyValPair;
import com.datatorrent.lib.util.TestUtils;

/**
 * Test for {@link com.datatorrent.lib.algo.UniqueValueCount} operator
 *
 * @since 0.3.5
 */
public class UniqueValueCountTest {
    private static Logger LOG = LoggerFactory.getLogger(UniqueValueCountTest.class);


    @Test
    public void uniqueCountTest(){
        UniqueValueCount<String> uniqueCountOper= new UniqueValueCount<String>();
        CollectorTestSink<KeyValPair <String,Integer>> outputSink = new CollectorTestSink<KeyValPair <String,Integer>>();
        TestUtils.setSink(uniqueCountOper.output, outputSink);

        uniqueCountOper.beginWindow(0);
        uniqueCountOper.input.process(new KeyValPair<String, Object>("test1",1));
        uniqueCountOper.input.process(new KeyValPair<String, Object>("test1",2));
        uniqueCountOper.input.process(new KeyValPair<String, Object>("test1",2));
        uniqueCountOper.endWindow();

        Assert.assertEquals("number emitted tuples", 1, outputSink.collectedTuples.size());
        KeyValPair<String,Integer> emittedPair= outputSink.collectedTuples.get(0);
        Assert.assertEquals("emitted key was ", "test1", emittedPair.getKey());
        Assert.assertEquals("emitted value was ",2, emittedPair.getValue().intValue());

        outputSink.clear();
        uniqueCountOper.beginWindow(1);
        uniqueCountOper.input.process(new KeyValPair<String,Object>("test1",1));
        uniqueCountOper.input.process(new KeyValPair<String, Object>("test1",2));
        uniqueCountOper.input.process(new KeyValPair<String, Object>("test1",2));
        uniqueCountOper.input.process(new KeyValPair<String, Object>("test2",1));
        uniqueCountOper.input.process(new KeyValPair<String, Object>("test2",2));
        uniqueCountOper.input.process(new KeyValPair<String, Object>("test2",2));
        uniqueCountOper.endWindow();

        ImmutableMap<String,Integer> answers=ImmutableMap.of("test1",2,"test2",2);

        Assert.assertEquals("number emitted tuples", 2, outputSink.collectedTuples.size());
        for(KeyValPair<String,Integer> emittedPair2: outputSink.collectedTuples) {
            Assert.assertEquals("emmit value of "+ emittedPair2.getKey() +" was ", answers.get(emittedPair2.getKey()), emittedPair2.getValue());
        }
        LOG.debug("Done unique count testing testing\n") ;
    }

}