使用 EasyMock 测试简单的多线程代码但得到奇怪的结果

Question

我正在使用 EasyMock:

测试一个简单的多线程代码

源代码：

public class EasyMockTest {

    ExecutorService executorService;
    TestObject testObject;

    public EasyMockTest(ExecutorService executorService, TestObject testObject)
    {
        this.executorService = executorService;
        this.testObject = testObject;
    }
    public void test()
    {
        try
        {
            executorService.submit(() ->{
                testObject.doSomething(); 
            });
        }
        catch(RejectedExecutionException ex)
        {
        }
     }
}


public class TestObject {

    public void doSomething()
    {
    }
}

使用 EasyMock 测试代码：

public class EasyMockTest_test {

    private TestObject testObject;
    private ExecutorService executorService;
    private EasyMockTest easyMockTest;

    @Before
    public void setUp()
    {
        executorService = new ThreadPoolExecutor(1, 1, 60, TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>(1));
        testObject = EasyMock.createMock(TestObject.class);
        easyMockTest = new EasyMockTest(executorService, testObject);
    }

    @Test
    public void test_easyMockTest()
    {
        testObject.doSomething(); 
        EasyMock.expectLastCall().andAnswer(new IAnswer<Void>(){
            @Override
            public Void answer() throws Throwable {
                Thread.sleep(100);
                return null;
            }}).times(2);

        EasyMock.replay(testObject);
        easyMockTest.test();
        easyMockTest.test();
        easyMockTest.test();

        EasyMock.verify(testObject);
    }
}

我认为在这种情况下 testObject.doSomething() 应该只调用两次。由于线程池有一个线程，队列大小为一个，我让前两个线程休眠。所以当我提交三个任务时，第三个应该被拒绝，前两个应该被调用。但是当我运行这段代码有错误：

java.lang.AssertionError:
Expectation failure on verify: TestObject.doSomething(): expected: 2, actual: 1 at org.easymock.internal.MocksControl.verify(MocksControl.java:225) at org.easymock.EasyMock.verify(EasyMock.java:2007) ...

这意味着该方法只被调用一次，我无法理解。

我也试过评论Thread.sleep(100)；这次实际调用次数变为2次，但我认为应该是3次，因为没有线程在休眠。

然后我尝试像这样移动 .times() 位置：

EasyMock.expectLastCall().times(2).andAnswer(new IAnswer<Void>(){
        @Override
        public Void answer() throws Throwable {
            Thread.sleep(100);
            return null;
        }});

这次错误变成：

java.lang.AssertionError: Expectation failure on verify: TestObject.doSomething(): expected: 3, actual: 2

为什么我给它 2 结果却期待 3？

抱歉，我不是 EasyMock 方面的专家，如果有人能提供帮助，我将不胜感激。

Answer 1

没有什么能确保在达到 verify 之前执行您的任务。你需要一些东西来调整执行速度。

这个有效：

@测试 public void test_easyMockTest() 抛出 InterruptedException { CountDownLatch latch = new CountDownLatch(3);

testObject.doSomething();
EasyMock.expectLastCall().andAnswer(new IAnswer<Void>(){
  @Override
  public Void answer() throws Throwable {
    latch.countDown();
    return null;
  }}).times(2);

EasyMock.replay(testObject);
easyMockTest.test();
easyMockTest.test();
easyMockTest.test();

latch.await(1, TimeUnit.SECONDS);

EasyMock.verify(testObject);

}

这里我假设您确实希望 RejectedExecutionException 被捕获并忽略。

使用 EasyMock 测试简单的多线程代码但得到奇怪的结果

Testing simple multithread code using EasyMock but got strange result

java

multithreading

easymock