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/*
* 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.lang3.tuple;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotEquals;
import static org.junit.jupiter.api.Assertions.assertNull;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;
import java.util.Calendar;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map.Entry;
import org.apache.commons.lang3.AbstractLangTest;
import org.junit.jupiter.api.Test;
/**
* Test the Pair class.
*/
public class PairTest extends AbstractLangTest {
@Test
public void testComparable1() {
final Pair<String, String> pair1 = Pair.of("A", "D");
final Pair<String, String> pair2 = Pair.of("B", "C");
assertEquals(0, pair1.compareTo(pair1));
assertTrue(pair1.compareTo(pair2) < 0);
assertEquals(0, pair2.compareTo(pair2));
assertTrue(pair2.compareTo(pair1) > 0);
}
@Test
public void testComparable2() {
final Pair<String, String> pair1 = Pair.of("A", "C");
final Pair<String, String> pair2 = Pair.of("A", "D");
assertEquals(0, pair1.compareTo(pair1));
assertTrue(pair1.compareTo(pair2) < 0);
assertEquals(0, pair2.compareTo(pair2));
assertTrue(pair2.compareTo(pair1) > 0);
}
@Test
public void testCompatibilityBetweenPairs() {
final Pair<Integer, String> pair = ImmutablePair.of(0, "foo");
final Pair<Integer, String> pair2 = MutablePair.of(0, "foo");
assertEquals(pair, pair2);
assertEquals(pair.hashCode(), pair2.hashCode());
final HashSet<Pair<Integer, String>> set = new HashSet<>();
set.add(pair);
assertTrue(set.contains(pair2));
pair2.setValue("bar");
assertNotEquals(pair, pair2);
assertNotEquals(pair.hashCode(), pair2.hashCode());
}
@Test
public void testEmptyArrayGenerics() {
final Pair<Integer, String>[] empty = Pair.emptyArray();
assertEquals(0, empty.length);
}
@Test
public void testEmptyArrayLength() {
@SuppressWarnings("unchecked")
final Pair<Integer, String>[] empty = (Pair<Integer, String>[]) Pair.EMPTY_ARRAY;
assertEquals(0, empty.length);
}
@Test
public void testFormattable_padded() {
final Pair<String, String> pair = Pair.of("Key", "Value");
assertEquals(" (Key,Value)", String.format("%1$20s", pair));
}
@Test
public void testFormattable_simple() {
final Pair<String, String> pair = Pair.of("Key", "Value");
assertEquals("(Key,Value)", String.format("%1$s", pair));
}
@Test
public void testMapEntry() {
final Pair<Integer, String> pair = ImmutablePair.of(0, "foo");
final HashMap<Integer, String> map = new HashMap<>();
map.put(0, "foo");
final Entry<Integer, String> entry = map.entrySet().iterator().next();
assertEquals(pair, entry);
assertEquals(pair.hashCode(), entry.hashCode());
}
@Test
public void testOfNonNull() {
assertThrows(NullPointerException.class, () -> Pair.ofNonNull(null, null));
assertThrows(NullPointerException.class, () -> Pair.ofNonNull(null, "x"));
assertThrows(NullPointerException.class, () -> Pair.ofNonNull("x", null));
final Pair<String, String> pair = Pair.ofNonNull("x", "y");
assertEquals("x", pair.getLeft());
assertEquals("y", pair.getRight());
}
@Test
public void testPairOfMapEntry() {
final HashMap<Integer, String> map = new HashMap<>();
map.put(0, "foo");
final Entry<Integer, String> entry = map.entrySet().iterator().next();
final Pair<Integer, String> pair = Pair.of(entry);
assertEquals(entry.getKey(), pair.getLeft());
assertEquals(entry.getValue(), pair.getRight());
}
@Test
public void testPairOfObjects() {
final Pair<Integer, String> pair = Pair.of(0, "foo");
assertTrue(pair instanceof ImmutablePair<?, ?>);
assertEquals(0, ((ImmutablePair<Integer, String>) pair).left.intValue());
assertEquals("foo", ((ImmutablePair<Integer, String>) pair).right);
final Pair<Object, String> pair2 = Pair.of(null, "bar");
assertTrue(pair2 instanceof ImmutablePair<?, ?>);
assertNull(((ImmutablePair<Object, String>) pair2).left);
assertEquals("bar", ((ImmutablePair<Object, String>) pair2).right);
final Pair<?, ?> pair3 = Pair.of(null, null);
assertNull(pair3.getLeft());
assertNull(pair3.getRight());
}
@Test
public void testToString() {
final Pair<String, String> pair = Pair.of("Key", "Value");
assertEquals("(Key,Value)", pair.toString());
}
@Test
public void testToStringCustom() {
final Calendar date = Calendar.getInstance();
date.set(2011, Calendar.APRIL, 25);
final Pair<String, Calendar> pair = Pair.of("DOB", date);
assertEquals("Test created on " + "04-25-2011", pair.toString("Test created on %2$tm-%2$td-%2$tY"));
}
}
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