在某些情况下可能适用的另一种解决方法是创建一个由最终类实现的接口，更改代码以使用该接口而不是具体类，然后模拟该接口。这样可以将契约(接口)与实现(最终类)分离。当然，如果您真正想要的是绑定到最终的类，这将不适用。

如果你正在使用Mockito2，这可以做到，新的孵化功能支持模拟最终类和方法。

需要注意的要点: 1. 创建一个名为“org.mockito.plugins”的简单文件。并将其放在名为mockito-extensions的文件夹中。这个文件夹应该在类路径上可用。 2. 上面创建的文件内容应该是一行，如下所示: mock-maker-inline

为了激活mockito扩展机制并使用此选择加入特性，需要执行上述两个步骤。

示例类如下:-

FinalClass.java

public final class FinalClass {

public final String hello(){
    System.out.println("Final class says Hello!!!");
    return "0";
}

}

Foo.java

public class Foo {

public String executeFinal(FinalClass finalClass){
    return finalClass.hello();
}

}

FooTest.java

public class FooTest {

@Test
public void testFinalClass(){
    // Instantiate the class under test.
    Foo foo = new Foo();

    // Instantiate the external dependency
    FinalClass realFinalClass = new FinalClass();

    // Create mock object for the final class. 
    FinalClass mockedFinalClass = mock(FinalClass.class);

    // Provide stub for mocked object.
    when(mockedFinalClass.hello()).thenReturn("1");

    // assert
    assertEquals("0", foo.executeFinal(realFinalClass));
    assertEquals("1", foo.executeFinal(mockedFinalClass));

}

}

希望能有所帮助。

完整的文章呈现在这里嘲笑不可嘲笑的。

在构建文件中添加以下内容:

如果使用gradle: build.gradle

testImplementation 'org.mockito:mockito-inline:2.13.0'

如果使用maven: pom.xml

<dependency>
    <groupId>org.mockito</groupId>
    <artifactId>mockito-inline</artifactId>
    <version>2.13.0</version>
    <scope>test</scope>
</dependency>

这是一个使mockito与final类一起工作的配置

如果您面临无法初始化内联字节伙伴模拟生成器。(Android不支持这个模拟生成器。) 将字节伙伴依赖项添加到构建中。gradle文件:

testImplementation 'net.bytebuddy:byte-buddy-agent:1.10.19'

src: https://mvnrepository.com/artifact/net.bytebuddy/byte-buddy

实际上有一种方法，我用来监视的。只有满足两个前提条件，它才会为你工作:

使用某种DI注入final类的实例 Final类实现了一个接口

请回顾Effective Java中的第16项。你可以创建一个包装器(不是final)并将所有调用转发给final类的实例:

public final class RainOnTrees implement IRainOnTrees {
    @Override public void startRain() { // some code here }
}

public class RainOnTreesWrapper implement IRainOnTrees {
    private IRainOnTrees delegate;
    public RainOnTreesWrapper(IRainOnTrees delegate) {this.delegate = delegate;}
    @Override public void startRain() { delegate.startRain(); }
}

现在你不仅可以模仿你的最后一个类，还可以监视它:

public class Seasons{
    RainOnTrees rain;
    public Seasons(IRainOnTrees rain) { this.rain = rain; };
    public void findSeasonAndRain(){
        rain.startRain();
   }
}

IRainOnTrees rain = spy(new RainOnTreesWrapper(new RainOnTrees()) // or mock(IRainOnTrees.class)
doNothing().when(rain).startRain();
new Seasons(rain).findSeasonAndRain();

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!

如果你需要在Android的测试中使用Mockito(即在Android设备中运行)，你不能使用Mockito -inline。有一个特殊的模拟android版本也没有解决“最终类”的问题。唯一可行的解决方案似乎是Dexmaker库。唯一的限制是它只能在Android P (Android 9, API 28)或更高版本上运行。导入方式如下:

androidTestImplementation "com.linkedin.dexmaker:dexmaker-mockito-inline:2.28.1"

注意，还有一个“dexmaker-mockito”版本，它也不适用于final类。确保您导入了“dexmaker-mockito-inline”。