试一试:

Mockito.mock(SomeMockableType.class,AdditionalAnswers.delegatesTo(someInstanceThatIsNotMockableOrSpyable));

这对我很管用。"SomeMockableType.class"是你想要模拟或监视的对象的父类，而someInstanceThatIsNotMockableOrSpyable是你想要模拟或监视的实际类。

详情请点击这里

你不能用Mockito模拟最后一个类，因为你自己不能这样做。

我所做的是创建一个非final类来包装final类并作为委托使用。一个例子是TwitterFactory类，这是我的mockable类:

public class TwitterFactory {

    private final twitter4j.TwitterFactory factory;

    public TwitterFactory() {
        factory = new twitter4j.TwitterFactory();
    }

    public Twitter getInstance(User user) {
        return factory.getInstance(accessToken(user));
    }

    private AccessToken accessToken(User user) {
        return new AccessToken(user.getAccessToken(), user.getAccessTokenSecret());
    }

    public Twitter getInstance() {
        return factory.getInstance();
    }
}

缺点是有很多样板代码;好处是您可以添加一些可能与您的应用程序业务相关的方法(如在上面的例子中，getInstance接受用户而不是accessToken)。

在你的例子中，我会创建一个非最终的RainOnTrees类，它委托给最终的类。或者，如果你能让它变成非最终结果，那就更好了。

为那些在Android + Kotlin上面临相同问题(Mockito + Final Class)的人节省时间。在Kotlin中，默认情况下类是final的。我在谷歌的一个Android样本中找到了一个解决方案。解决方案从这里选择:https://github.com/googlesamples/android-architecture-components/blob/master/GithubBrowserSample

创建以下注释:

/**
 * This annotation allows us to open some classes for mocking purposes while they are final in
 * release builds.
 */
@Target(AnnotationTarget.ANNOTATION_CLASS)
annotation class OpenClass

/**
 * Annotate a class with [OpenForTesting] if you want it to be extendable in debug builds.
 */
@OpenClass
@Target(AnnotationTarget.CLASS)
annotation class OpenForTesting

修改gradle文件。举个例子:https://github.com/googlesamples/android-architecture-components/blob/master/GithubBrowserSample/app/build.gradle

apply plugin: 'kotlin-allopen'

allOpen {
    // allows mocking for classes w/o directly opening them for release builds
    annotation 'com.android.example.github.testing.OpenClass'
}

现在你可以注释任何类，使其开放测试:

@OpenForTesting
class RepoRepository 

Mockito 2现在支持final类和方法!

但就目前而言，这只是一个“孵化”功能。它需要一些步骤来激活它，这些步骤在Mockito 2中的新内容中描述:

Mocking of final classes and methods is an incubating, opt-in feature. It uses a combination of Java agent instrumentation and subclassing in order to enable mockability of these types. As this works differently to our current mechanism and this one has different limitations and as we want to gather experience and user feedback, this feature had to be explicitly activated to be available ; it can be done via the mockito extension mechanism by creating the file src/test/resources/mockito-extensions/org.mockito.plugins.MockMaker containing a single line: mock-maker-inline After you created this file, Mockito will automatically use this new engine and one can do : final class FinalClass { final String finalMethod() { return "something"; } } FinalClass concrete = new FinalClass(); FinalClass mock = mock(FinalClass.class); given(mock.finalMethod()).willReturn("not anymore"); assertThat(mock.finalMethod()).isNotEqualTo(concrete.finalMethod()); In subsequent milestones, the team will bring a programmatic way of using this feature. We will identify and provide support for all unmockable scenarios. Stay tuned and please let us know what you think of this feature!

我克服了这条信息:

org.mockito.exceptions.base.MockitoException: 不能模拟/间谍类org.slf4j.impl.Log4jLoggerAdapter Mockito不能模仿/侦察，因为: 最终类或匿名类

从这个:log = spy(log);

用这个代替:

log = mock(Logger.class);

这样就有用了。

我猜“默认”记录器适配器是final类的一个实例，所以我不能“侦察”它，但我可以模拟整个事情。去图…

这可能意味着你可以用其他一些“非最终”实例来代替它，如果你有的话。或者简化版本等等。就其价值而言……

请看JMockit。它有大量的文档和示例。这里你有一个解决你的问题的例子(为了简化，我添加了构造函数到Seasons注入模拟RainOnTrees实例):

package jmockitexample;

import mockit.Mocked;
import mockit.Verifications;
import mockit.integration.junit4.JMockit;
import org.junit.Test;
import org.junit.runner.RunWith;

@RunWith(JMockit.class)
public class SeasonsTest {

    @Test
    public void shouldStartRain(@Mocked final RainOnTrees rain) {
        Seasons seasons = new Seasons(rain);

        seasons.findSeasonAndRain();

        new Verifications() {{
            rain.startRain();
        }};
    }

    public final class RainOnTrees {
        public void startRain() {
            // some code here
        }

    }

    public class Seasons {

        private final RainOnTrees rain;

        public Seasons(RainOnTrees rain) {
            this.rain = rain;
        }

        public void findSeasonAndRain() {
            rain.startRain();
        }

    }
}