1 /* 2 * Copyright (C) 2012 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 static org.mockito.Answers.CALLS_REAL_METHODS; 20 import static org.mockito.Mockito.doReturn; 21 import static org.mockito.Mockito.mock; 22 23 import com.google.common.base.Function; 24 import com.google.common.collect.ForwardingObject; 25 import com.google.common.collect.Iterables; 26 import com.google.common.testing.ForwardingWrapperTester; 27 import java.lang.reflect.Method; 28 import java.util.Arrays; 29 30 /** 31 * Tester for typical subclass of {@link ForwardingObject} by using EasyMock partial mocks. 32 * 33 * @author Ben Yu 34 */ 35 final class ForwardingObjectTester { 36 37 private static final Method DELEGATE_METHOD; 38 39 static { 40 try { 41 DELEGATE_METHOD = ForwardingObject.class.getDeclaredMethod("delegate"); 42 DELEGATE_METHOD.setAccessible(true); 43 } catch (SecurityException e) { 44 throw new RuntimeException(e); 45 } catch (NoSuchMethodException e) { 46 throw new AssertionError(e); 47 } 48 } 49 50 /** 51 * Ensures that all interface methods of {@code forwarderClass} are forwarded to the {@link 52 * ForwardingObject#delegate}. {@code forwarderClass} is assumed to only implement one interface. 53 */ testForwardingObject(final Class<T> forwarderClass)54 static <T extends ForwardingObject> void testForwardingObject(final Class<T> forwarderClass) { 55 @SuppressWarnings("unchecked") // super interface type of T 56 Class<? super T> interfaceType = 57 (Class<? super T>) Iterables.getOnlyElement(Arrays.asList(forwarderClass.getInterfaces())); 58 new ForwardingWrapperTester() 59 .testForwarding( 60 interfaceType, 61 new Function<Object, T>() { 62 @Override 63 public T apply(Object delegate) { 64 T mock = mock(forwarderClass, CALLS_REAL_METHODS.get()); 65 try { 66 T stubber = doReturn(delegate).when(mock); 67 DELEGATE_METHOD.invoke(stubber); 68 } catch (Exception e) { 69 throw new RuntimeException(e); 70 } 71 return mock; 72 } 73 }); 74 } 75 } 76