1/* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package libcore.java.util.function; 18 19import junit.framework.TestCase; 20 21import java.util.function.Consumer; 22 23public class ConsumerTest extends TestCase { 24 25 public void testAndThen() throws Exception { 26 Consumer<StringBuilder> sweet = s -> s.append("sweet"); 27 Consumer<StringBuilder> dude = s -> s.append("dude"); 28 29 StringBuilder sb = new StringBuilder(); 30 sweet.andThen(dude).accept(sb); 31 assertEquals("sweetdude", sb.toString()); 32 33 sb.setLength(0); 34 dude.andThen(sweet).accept(sb); 35 assertEquals("dudesweet", sb.toString()); 36 } 37 38 public void testAndThen_null() throws Exception { 39 Consumer<StringBuilder> one = s -> s.append("one"); 40 try { 41 one.andThen(null); 42 fail(); 43 } catch (NullPointerException expected) {} 44 } 45} 46