src/test/java/org/apache/datasketches/pig/theta/JaccardSimilarityTest.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
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 *
 * http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.datasketches.pig.theta;

import static org.apache.datasketches.pig.PigTestingUtil.createDbaFromQssRange;
import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertNotNull;

import java.io.IOException;

import org.apache.pig.EvalFunc;
import org.apache.pig.data.Tuple;
import org.apache.pig.data.TupleFactory;
import org.testng.annotations.Test;

@SuppressWarnings("javadoc")
public class JaccardSimilarityTest {

  @Test
  public void checkNullCombinations() throws IOException {
    EvalFunc<Tuple> jaccardFunc = new JaccardSimilarity();

    Tuple inputTuple, resultTuple;
    //Two nulls
    inputTuple = TupleFactory.getInstance().newTuple(2);
    resultTuple = jaccardFunc.exec(inputTuple);
    assertNotNull(resultTuple);
    assertEquals(resultTuple.size(), 3);
    for (Object d : resultTuple.getAll()) {
      assertEquals(d, 0.0);
    }

    //A is null
    inputTuple = TupleFactory.getInstance().newTuple(2);
    inputTuple.set(1, createDbaFromQssRange(256, 0, 128));
    resultTuple = jaccardFunc.exec(inputTuple);
    assertNotNull(resultTuple);
    assertEquals(resultTuple.size(), 3);
    for (Object d : resultTuple.getAll()) {
      assertEquals(d, 0.0);
    }

    //A is valid, B is null
    inputTuple = TupleFactory.getInstance().newTuple(2);
    inputTuple.set(0, createDbaFromQssRange(256, 0, 256));
    resultTuple = jaccardFunc.exec(inputTuple);
    assertNotNull(resultTuple);
    assertEquals(resultTuple.size(), 3);
    for (Object d : resultTuple.getAll()) {
      assertEquals(d, 0.0);
    }

    //Both valid
    inputTuple = TupleFactory.getInstance().newTuple(2);
    inputTuple.set(0, createDbaFromQssRange(256, 0, 256));
    inputTuple.set(1, createDbaFromQssRange(256, 0, 128));
    resultTuple = jaccardFunc.exec(inputTuple);
    assertNotNull(resultTuple);
    assertEquals(resultTuple.size(), 3);
    assertEquals(resultTuple.get(0), 0.5);
    assertEquals(resultTuple.get(1), 0.5);
    assertEquals(resultTuple.get(2), 0.5);
  }

}