giraph-examples/src/test/java/org/apache/giraph/examples/MinimumIntCombinerTest.java

/*
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 * 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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package org.apache.giraph.examples;

import static org.junit.Assert.assertEquals;

import org.apache.giraph.combiner.Combiner;
import org.apache.giraph.combiner.MinimumIntCombiner;
import org.apache.hadoop.io.IntWritable;
import org.junit.Test;

public class MinimumIntCombinerTest {

  @Test
  public void testCombiner() throws Exception {
    Combiner<IntWritable, IntWritable> combiner =
        new MinimumIntCombiner();

    IntWritable vertexId = new IntWritable(1);
    IntWritable result = combiner.createInitialMessage();
    combiner.combine(vertexId, result, new IntWritable(39947466));
    combiner.combine(vertexId, result, new IntWritable(199));
    combiner.combine(vertexId, result, new IntWritable(42));
    combiner.combine(vertexId, result, new IntWritable(19998888));
    assertEquals(42, result.get());
  }
}