| /* |
| * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 8009736 8010279 |
| * @run testng BasicTest |
| */ |
| |
| import java.util.Comparator; |
| import java.util.function.BinaryOperator; |
| import java.util.function.Function; |
| import java.util.function.ToIntFunction; |
| import org.testng.annotations.Test; |
| |
| |
| import static java.util.function.BinaryOperator.minBy; |
| import static java.util.function.BinaryOperator.maxBy; |
| import static org.testng.Assert.assertSame; |
| import static org.testng.Assert.fail; |
| |
| /** |
| * Unit tests for helper methods in Comparators |
| */ |
| @Test(groups = "unit") |
| public class BasicTest { |
| |
| private static class People { |
| final String firstName; |
| final String lastName; |
| final int age; |
| |
| People(String first, String last, int age) { |
| firstName = first; |
| lastName = last; |
| this.age = age; |
| } |
| |
| String getFirstName() { return firstName; } |
| String getLastName() { return lastName; } |
| int getAge() { return age; } |
| } |
| |
| private final People people[] = { |
| new People("John", "Doe", 34), |
| new People("Mary", "Doe", 30), |
| }; |
| |
| public void testMaxBy() { |
| Comparator<People> cmp = Comparator.comparing(People::getFirstName); |
| // lesser |
| assertSame(maxBy(cmp).apply(people[0], people[1]), people[1]); |
| // euqal |
| cmp = Comparator.comparing(People::getLastName); |
| assertSame(maxBy(cmp).apply(people[0], people[1]), people[0]); |
| // greater |
| cmp = Comparator.comparingInt(People::getAge); |
| assertSame(maxBy(cmp).apply(people[0], people[1]), people[0]); |
| } |
| |
| public void testMinBy() { |
| Comparator<People> cmp = Comparator.comparing(People::getFirstName); |
| // lesser |
| assertSame(minBy(cmp).apply(people[0], people[1]), people[0]); |
| // euqal |
| cmp = Comparator.comparing(People::getLastName); |
| assertSame(minBy(cmp).apply(people[0], people[1]), people[0]); |
| // greater |
| cmp = Comparator.comparingInt(People::getAge); |
| assertSame(minBy(cmp).apply(people[0], people[1]), people[1]); |
| } |
| |
| public void testNulls() { |
| try { |
| BinaryOperator<String> op = minBy(null); |
| fail("minBy(null) should throw NPE"); |
| } catch (NullPointerException npe) {} |
| |
| try { |
| BinaryOperator<String> op = maxBy(null); |
| fail("maxBy(null) should throw NPE"); |
| } catch (NullPointerException npe) {} |
| } |
| } |