1/* 2 * Copyright (C) 2010 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; 18 19import java.util.Random; 20 21public class RandomTest extends junit.framework.TestCase { 22 public void test_subclassing() throws Exception { 23 // http://b/2502231 24 // Ensure that Random's constructors call setSeed by emulating the active ingredient 25 // from the bug: the subclass' setSeed had a side-effect necessary for the correct 26 // functioning of next. 27 class MyRandom extends Random { 28 public String state; 29 public MyRandom() { super(); } 30 public MyRandom(long l) { super(l); } 31 @Override protected synchronized int next(int bits) { return state.length(); } 32 @Override public synchronized void setSeed(long seed) { state = Long.toString(seed); } 33 } 34 // Test the 0-argument constructor... 35 MyRandom r1 = new MyRandom(); 36 r1.nextInt(); 37 assertNotNull(r1.state); 38 // Test the 1-argument constructor... 39 MyRandom r2 = new MyRandom(123L); 40 r2.nextInt(); 41 assertNotNull(r2.state); 42 } 43} 44