| /* |
| * 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.commons.math4.util; |
| |
| import org.apache.commons.math4.util.Pair; |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| /** |
| * Test for {@link Pair}. |
| */ |
| public class PairTest { |
| |
| @Test |
| public void testAccessor() { |
| final Pair<Integer, Double> p |
| = new Pair<>(new Integer(1), new Double(2)); |
| Assert.assertEquals(new Integer(1), p.getKey()); |
| Assert.assertEquals(2, p.getValue().doubleValue(), Math.ulp(1d)); |
| } |
| |
| @Test |
| public void testAccessor2() { |
| final Pair<Integer, Double> p |
| = new Pair<>(new Integer(1), new Double(2)); |
| |
| // Check that both APIs refer to the same data. |
| |
| Assert.assertTrue(p.getFirst() == p.getKey()); |
| Assert.assertTrue(p.getSecond() == p.getValue()); |
| } |
| |
| @Test |
| public void testEquals() { |
| Pair<Integer, Double> p1 = new Pair<>(null, null); |
| Assert.assertFalse(p1.equals(null)); |
| |
| Pair<Integer, Double> p2 = new Pair<>(null, null); |
| Assert.assertTrue(p1.equals(p2)); |
| |
| p1 = new Pair<>(new Integer(1), new Double(2)); |
| Assert.assertFalse(p1.equals(p2)); |
| |
| p2 = new Pair<>(new Integer(1), new Double(2)); |
| Assert.assertTrue(p1.equals(p2)); |
| |
| Pair<Integer, Float> p3 = new Pair<>(new Integer(1), new Float(2)); |
| Assert.assertFalse(p1.equals(p3)); |
| } |
| |
| @Test |
| public void testHashCode() { |
| final MyInteger m1 = new MyInteger(1); |
| final MyInteger m2 = new MyInteger(1); |
| |
| final Pair<MyInteger, MyInteger> p1 = new Pair<>(m1, m1); |
| final Pair<MyInteger, MyInteger> p2 = new Pair<>(m2, m2); |
| // Same contents, same hash code. |
| Assert.assertTrue(p1.hashCode() == p2.hashCode()); |
| |
| // Different contents, different hash codes. |
| m2.set(2); |
| Assert.assertFalse(p1.hashCode() == p2.hashCode()); |
| } |
| |
| @Test |
| public void testToString() { |
| Assert.assertEquals("[null, null]", new Pair<>(null, null).toString()); |
| Assert.assertEquals("[foo, 3]", new Pair<>("foo", 3).toString()); |
| } |
| |
| @Test |
| public void testCreate() { |
| final Pair<String, Integer> p1 = Pair.create("foo", 3); |
| Assert.assertNotNull(p1); |
| final Pair<String, Integer> p2 = new Pair<>("foo", 3); |
| Assert.assertEquals(p2, p1); |
| } |
| |
| /** |
| * A mutable integer. |
| */ |
| private static class MyInteger { |
| private int i; |
| |
| public MyInteger(int i) { |
| this.i = i; |
| } |
| |
| public void set(int i) { |
| this.i = i; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (!(o instanceof MyInteger)) { |
| return false; |
| } else { |
| return i == ((MyInteger) o).i; |
| } |
| } |
| |
| @Override |
| public int hashCode() { |
| return i; |
| } |
| } |
| } |