如何使用EasyMock修改模拟方法的可变方法参数?
例如,我有一个使用BlockingQueue的类.我想模仿BlockingQueue成员进行单元测试.我的类调用方法queue.drainTo(Collection c).调用此方法将从队列中删除元素并将其添加到集合中.我如何使用EasyMock模拟这种行为?例子很棒.
解决方法
您可以使用
andAnswer和
getCurrentArguments:
public void testDrainToQueue() { BlockingQueue<Foo> queue = EasyMock.createMock(BlockingQueue.class); EasyMock.expect(queue.drainTo(EasyMock.isA(List.class))) .andAnswer(new IAnswer<Integer>() { public Integer answer() { ((List) EasyMock.getCurrentArguments()[0]).add(new Foo(123)); return 1; // 1 element drained } }); EasyMock.replay(queue); ... }
private static IAnswer<Integer> fakeDrainReturning(final List drainedElements) { return new IAnswer<Integer() { @Override public Integer answer() { ((List) EasyMock.getCurrentArguments()[0]).addAll(drainedElements); return drainedElements.size(); } }; }
然后你可以这样做:
List<Foo> drainedElements = Arrays.asList(new Foo(123),new Foo(42)); EasyMock.expect(queue.drainTo(EasyMock.isA(List.class))) .andAnswer(fakeDrainReturning(drainedElements));