content: /**
   * 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 org.apache.aurora.common.collections;
  
  import com.google.common.base.Function;
  import com.google.common.base.Functions;
  
  import org.junit.Test;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNull;
  
  /**
   * @author John Sirois
   */
  public class PairTest {
    @Test
    public void testSlots() {
      assertEquals("jake", Pair.of("jake", null).getFirst());
      assertNull(Pair.of("jake", null).getSecond());
      assertNull(Pair.of(null, "jim").getFirst());
      assertEquals("jim", Pair.of(null, "jim").getSecond());
    }
  
    @Test
    public void testValueEquals() {
      assertEquals(new Pair<Integer, String>(1, "a"), Pair.of(1, "a"));
      assertEquals(new Pair<Integer, String>(null, "a"), Pair.<Integer, String>of(null, "a"));
      assertEquals(new Pair<Integer, String>(1, null), Pair.<Integer, String>of(1, null));
    }
  
    @Test
    public void testExtractors() {
      Function<Pair<Pair<String, Integer>, Character>, Pair<String, Integer>> first = Pair.first();
      Function<Pair<String, Integer>, Integer> second = Pair.second();
      assertEquals(Integer.valueOf(42),
          Functions.compose(second, first).apply(Pair.of(Pair.of("arthur", 42), 'z')));
    }
  }
  