1 /* 2 * Copyright (C) 2009 The Guava Authors 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 17 package com.google.common.util.concurrent; 18 19 import junit.framework.TestCase; 20 21 import java.util.concurrent.Callable; 22 23 /** 24 * Unit tests for {@link Callables}. 25 * 26 * @author Isaac Shum 27 */ 28 public class CallablesTest extends TestCase { 29 testReturning()30 public void testReturning() throws Exception { 31 assertNull(Callables.returning(null).call()); 32 33 Object value = new Object(); 34 Callable<Object> callable = Callables.returning(value); 35 assertSame(value, callable.call()); 36 // Expect the same value on subsequent calls 37 assertSame(value, callable.call()); 38 } 39 } 40