| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed 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 libcore.java.util; |
| |
| import java.util.Random; |
| |
| public class RandomTest extends junit.framework.TestCase { |
| public void test_subclassing() throws Exception { |
| // http://b/2502231 |
| // Ensure that Random's constructors call setSeed by emulating the active ingredient |
| // from the bug: the subclass' setSeed had a side-effect necessary for the correct |
| // functioning of next. |
| class MyRandom extends Random { |
| public String state; |
| public MyRandom() { super(); } |
| public MyRandom(long l) { super(l); } |
| @Override protected synchronized int next(int bits) { return state.length(); } |
| @Override public synchronized void setSeed(long seed) { state = Long.toString(seed); } |
| } |
| // Test the 0-argument constructor... |
| MyRandom r1 = new MyRandom(); |
| r1.nextInt(); |
| assertNotNull(r1.state); |
| // Test the 1-argument constructor... |
| MyRandom r2 = new MyRandom(123L); |
| r2.nextInt(); |
| assertNotNull(r2.state); |
| } |
| } |