1 /* 2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test 26 * @bug 8009736 8010279 27 * @run testng BasicTest 28 */ 29 30 package test.java.util.function.BinaryOperator; 31 32 import java.util.Comparator; 33 import java.util.function.BinaryOperator; 34 import java.util.function.Function; 35 import java.util.function.ToIntFunction; 36 import org.testng.annotations.Test; 37 38 39 import static java.util.function.BinaryOperator.minBy; 40 import static java.util.function.BinaryOperator.maxBy; 41 import static org.testng.Assert.assertSame; 42 import static org.testng.Assert.fail; 43 44 /** 45 * Unit tests for helper methods in Comparators 46 */ 47 @Test(groups = "unit") 48 public class BasicTest { 49 50 private static class People { 51 final String firstName; 52 final String lastName; 53 final int age; 54 People(String first, String last, int age)55 People(String first, String last, int age) { 56 firstName = first; 57 lastName = last; 58 this.age = age; 59 } 60 getFirstName()61 String getFirstName() { return firstName; } getLastName()62 String getLastName() { return lastName; } getAge()63 int getAge() { return age; } 64 } 65 66 private final People people[] = { 67 new People("John", "Doe", 34), 68 new People("Mary", "Doe", 30), 69 }; 70 testMaxBy()71 public void testMaxBy() { 72 Comparator<People> cmp = Comparator.comparing(People::getFirstName); 73 // lesser 74 assertSame(maxBy(cmp).apply(people[0], people[1]), people[1]); 75 // euqal 76 cmp = Comparator.comparing(People::getLastName); 77 assertSame(maxBy(cmp).apply(people[0], people[1]), people[0]); 78 // greater 79 cmp = Comparator.comparingInt(People::getAge); 80 assertSame(maxBy(cmp).apply(people[0], people[1]), people[0]); 81 } 82 testMinBy()83 public void testMinBy() { 84 Comparator<People> cmp = Comparator.comparing(People::getFirstName); 85 // lesser 86 assertSame(minBy(cmp).apply(people[0], people[1]), people[0]); 87 // euqal 88 cmp = Comparator.comparing(People::getLastName); 89 assertSame(minBy(cmp).apply(people[0], people[1]), people[0]); 90 // greater 91 cmp = Comparator.comparingInt(People::getAge); 92 assertSame(minBy(cmp).apply(people[0], people[1]), people[1]); 93 } 94 testNulls()95 public void testNulls() { 96 try { 97 BinaryOperator<String> op = minBy(null); 98 fail("minBy(null) should throw NPE"); 99 } catch (NullPointerException npe) {} 100 101 try { 102 BinaryOperator<String> op = maxBy(null); 103 fail("maxBy(null) should throw NPE"); 104 } catch (NullPointerException npe) {} 105 } 106 } 107