PairListTest.java

package org.springframework.roo.support.util;

import static org.junit.Assert.assertEquals;

import java.util.Arrays;

import org.apache.commons.lang3.tuple.MutablePair;
import org.apache.commons.lang3.tuple.Pair;
import org.junit.Test;

/**
 * Unit test of {@link PairList}
 * 
 * @author Andrew Swan
 * @since 1.2.0
 */
public class PairListTest {

  private static final int KEY_1 = 10;
  private static final int KEY_2 = 20;
  private static final String VALUE_1 = "a";
  private static final String VALUE_2 = "b";
  private static final MutablePair<Integer, String> PAIR_1 = new MutablePair<Integer, String>(
      KEY_1, VALUE_1);
  private static final MutablePair<Integer, String> PAIR_2 = new MutablePair<Integer, String>(
      KEY_2, VALUE_2);

  @Test
  public void testConstructFromListsOfKeysAndValues() {
    // Invoke
    final PairList<Integer, String> pairs =
        new PairList<Integer, String>(Arrays.asList(KEY_1, KEY_2), Arrays.asList(VALUE_1, VALUE_2));

    // Check
    assertEquals(2, pairs.size());
    assertEquals(PAIR_1, pairs.get(0));
    assertEquals(PAIR_2, pairs.get(1));
  }

  @Test
  public void testConstructFromNulListsOfKeysAndValues() {
    // Invoke
    final PairList<Integer, String> pairs = new PairList<Integer, String>(null, null);

    // Check
    assertEquals(0, pairs.size());
  }

  @SuppressWarnings("unchecked")
  @Test
  public void testConstructFromVarargArrayOfPairs() {
    // Invoke
    final PairList<Integer, String> pairs = new PairList<Integer, String>(PAIR_1, PAIR_2);

    // Check
    assertEquals(2, pairs.size());
    assertEquals(Arrays.asList(KEY_1, KEY_2), pairs.getKeys());
    assertEquals(Arrays.asList(VALUE_1, VALUE_2), pairs.getValues());
    final Pair<Integer, String>[] array = pairs.toArray();
    assertEquals(pairs.size(), array.length);
    assertEquals(pairs, Arrays.asList(array));
  }
}