common/src/test/java/org/apache/nemo/common/PairTest.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * 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
 *
 * 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.nemo.common;

import org.apache.nemo.common.ir.vertex.IRVertex;
import org.apache.nemo.common.test.EmptyComponents;
import org.junit.Test;

import static org.junit.Assert.assertEquals;

/**
 * Test {@link Pair}.
 */
public class PairTest {
  final Object leftObject = new Object();
  final Object rightObject = new Object();
  private final IRVertex leftSource = new EmptyComponents.EmptySourceVertex<>("leftSource");
  private final IRVertex rightSource = new EmptyComponents.EmptySourceVertex<>("rightSource");

  @Test
  public void testPair() {
    final Pair<Object, Object> objectPair = Pair.of(leftObject, rightObject);
    final Pair<Object, Object> identicalObjectPair = Pair.of(leftObject, rightObject);
    final Pair<IRVertex, IRVertex> irVertexPair = Pair.of(leftSource, rightSource);
    final Pair<Object, IRVertex> mixedPair = Pair.of(leftObject, rightSource);

    assertEquals(leftObject, objectPair.left());
    assertEquals(rightObject, objectPair.right());
    assertEquals(leftSource, irVertexPair.left());
    assertEquals(rightSource, irVertexPair.right());
    assertEquals(leftObject, mixedPair.left());
    assertEquals(rightSource, mixedPair.right());
    assertEquals(objectPair, identicalObjectPair);
  }
}