EasyMock 中 Mockito.spy/doReturn 的类比是什么？

Question

想象一下，我有以下 class:

public class TestClass {
    public class Index<X> {

    }
    public class IndexData {
        private final Index<?> index;

        private final ReentrantReadWriteLock lock =
            new ReentrantReadWriteLock();

        public IndexData(final Index<?> index) {
            super();
            this.index = index;
        }

        public Index<?> getIndex() {
            return index;
        }

        public Lock getReadLock() {
            return lock.readLock();
        }

        public Lock getWriteLock() {
            return lock.writeLock();
        }   
    }

    public void add(final InputClass input)
    {
        final IndexData index = getIndex(input);

        final Lock lock = index.getWriteLock();
        lock.lock();
        try {
            // Do something here, which requires synchronization
        } finally {
            lock.unlock();
        }
    }

    protected IndexData getIndex(final InputClass input) {
        // Some logic of getting the index for input
        return null;
    }
}

我想写一个单元测试来验证

在add方法中，使用了index.getWriteLock()（不是index.getReadLock()），
锁被占用并且
已发布。

使用 Mockito 我可以编写这样的测试：

@Test
public void testAddUsesWriteLock() {
    // Prepare
    final TestClass objectUnderTest = Mockito.spy(new TestClass());
    final InputClass input = Mockito.mock(InputClass.class);
    final IndexData indexData = Mockito.mock(IndexData.class);
    Mockito.doReturn(indexData).when(objectUnderTest).getIndex(input);
    final Lock lock = Mockito.mock(Lock.class);
    Mockito.doReturn(lock).when(indexData).getWriteLock();

    // Invoke method under test
    objectUnderTest.add(input);

    // Verify
    Mockito.verify(indexData).getWriteLock();
    Mockito.verify(indexData, Mockito.never()).getReadLock();
    Mockito.verify(lock).lock();
    Mockito.verify(lock).unlock();
}

如何使用 EasyMock 做同样的事情？

具体：如何在 EasyMock 中模拟 getIndex 方法 return（第 Mockito.doReturn(indexData).when(objectUnderTest).getIndex(input) 行）？

注意：你可以找到这个例子的代码here。

Answer 1

本着提供可能解决方案的精神（与我上面的评论相反），您可以尝试以下方法之一

选项 1

如果 TestClass 实现了一个接口，您可以使用 andDelegateTo() as described in this post that talks about Easymock not supporting spying

实现类似的测试

选项 2

通过专门针对您的测试要求扩展 TestClass 来消除您对间谍的需求。这是处理无法更改被测代码的遗留代码库的常用方法。

我将在这个示例中使用 Mockito，以便它与您的问题保持一致，但是这个概念将与 Easymock 相同。

public class TestClassUsingMockito {
    /**
    We extend the original class under test so that we can override the creation of IndexData and
    thereby remove the responsibility of creating this object from the @Test method
    */
    private class ClassForTesting extends TestClass {

        private Lock lock;
        private IndexData indexData;

        public ClassForTesting(IndexData indexData, Lock lock) {
            this.indexData = indexData;
            this.lock = lock;
        }

        @Override
        protected IndexData getIndex(InputClass input) {
            return indexData;
        }
    }

    /**
    Look Ma' no more Spys!
    */
    @Test
    public void testAddUsesWriteLock() {        
        // Prepare
        final Lock lock = Mockito.mock(Lock.class);
        final IndexData indexData = Mockito.mock(IndexData.class);
        Mockito.doReturn(lock).when(indexData).getWriteLock();
        // ... now use your new subclass for testing
        final TestClass objectUnderTest = new ClassForTesting(indexData, lock);
        final InputClass input = Mockito.mock(InputClass.class);

        // Invoke method under test
        objectUnderTest.add(input);

        // Verify
        Mockito.verify(indexData).getWriteLock();
        Mockito.verify(indexData, Mockito.never()).getReadLock();
        Mockito.verify(lock).lock();
        Mockito.verify(lock).unlock(); 
    }
}

Mockito.spy/doReturn在EasyMock中的类比是什么？

因此，在您的测试中消除了对 Spy() 的需求后，Mockito 调用

Mockito.doReturn(lock).when(indexData).getWriteLock();

在EasyMock中可以写成

expect(indexData.getWriteLock()).andStubReturn(lock);

上面相同 Mockito 测试的 EasyMock 示例

public class TestClassUsingEasymock extends EasyMockSupport {

    private class ClassForTesting extends TestClass {

        private Lock lock;
        private IndexData indexData;

        public ClassForTesting(IndexData indexData, Lock lock) {
            this.indexData = indexData;
            this.lock = lock;
        }

        @Override
        protected IndexData getIndex(InputClass input) {
            return indexData;
        }
    }


    @Test
    public void testAddUsesWriteLock() {
        // Prepare
        final Lock lock = createNiceMock(Lock.class);       
        final IndexData indexData = createNiceMock(IndexData.class);
        EasyMock.expect(indexData.getWriteLock()).andStubReturn(lock);

        // ... now use your new subclass for testing
        final TestClass objectUnderTest = new ClassForTesting(indexData, lock);
        final InputClass input = createNiceMock(InputClass.class);

        lock.lock();
        EasyMock.expectLastCall();

        lock.unlock();
        EasyMock.expectLastCall();

        replayAll();

        // Invoke method under test
        objectUnderTest.add(input);

        // Verify
        verifyAll();
    }
}

EasyMock 中 Mockito.spy/doReturn 的类比是什么？

What is the analogon of Mockito.spy/doReturn in EasyMock?

java

unit-testing

mocking

mockito

easymock