EasyMock 3.0，模拟类抛出java.lang.IllegalStateException：没有对模拟的最后一次调用 [英] EasyMock 3.0, mocking class throws java.lang.IllegalStateException: no last call on a mock available

问题描述

运行以下单元测试会引发异常：java.lang.IllegalStateException：没有对模拟的最后一次调用

Running the following unit test throws the exception: java.lang.IllegalStateException: no last call on a mock available

import org.easymock.*;
import org.junit.*;

public class MyTest {

    @Test
    public void testWithClass() {
        Thread threadMock = EasyMock.createMock(Thread.class);
        EasyMock.expect(threadMock.isAlive()).andReturn(true);
    }
}

我不确定自己在做什么，可以在网络上找不到任何好的例子。您如何使用EasyMock 3.0模拟类。上面的单元测试有什么问题？任何帮助将不胜感激。

I am not sure what I am doing wrong and can not find any good examples on the web. How do you mock a class using EasyMock 3.0. What is wrong with the above unit test? Any help would be greatly appreciated.

我的项目包括以下maven依赖项

My project includes the following maven dependencies

<dependency>
   <groupId>org.easymock</groupId>
   <artifactId>easymock</artifactId>
   <version>3.0</version>
   <scope>test</scope>
</dependency>
<dependency>
   <groupId>cglib</groupId>
   <artifactId>cglib-nodep</artifactId>
   <version>2.2</version>
   <scope>test</scope>
</dependency>
<dependency>
   <groupId>org.objenesis</groupId>
   <artifactId>objenesis</artifactId>
   <version>1.2</version>
   <scope>test</scope>
</dependency>

推荐答案

此异常的原因是 Thread＃isAlive（）是 final 方法，但是EasyMock不支持模拟最终方法。因此，对出现在 EasyMock.expect（...）中的此方法的调用不视为模拟调用。

The reason for this exception is that Thread#isAlive() is a final method, but EasyMock does not support the mocking of final methods. So, the call to this method which appears inside EasyMock.expect(...) is not seen as a "call on a mock".

要模拟最终方法，您需要使用其他模拟工具，例如JMockit（由我开发）：

To mock final methods you would need a different mocking tool, such as JMockit (which I develop):

public void testMockingFinalMethod(@Mocked("isAlive") Thread mock)
{
    new Expectations()
    {{
        mock.isAlive(); result = true;
    }};

    assertTrue(mock.isAlive());
}

模拟API实际上并不要求明确指定要模拟的方法，一般情况下。但是， Thread 类是一个棘手的类。

The mocking API doesn't actually require that methods to be mocked are specified explicitly, in the general case. The Thread class is a tricky one, though.

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