使用Dagger 2进行Android单元测试

Question

public class PipeGameApplication extends Application {

    private PipeGame pipeGame;

    @Singleton
    @Component(modules = PipeGameModule.class)
    public interface PipeGame {
        void inject(BoardFragment boardFragment);
        void inject(ConveyorFragment conveyorFragment);
    }

    @Override
    public void onCreate() {
        super.onCreate();
        pipeGame = DaggerPipeGameApplication_PipeGame.create();
    }

    public PipeGame component() {
        return pipeGame;
    }
}

@Module
public class PipeGameModule {

    @Provides
    @Singleton
    Random provideRandom() {
        return new Random();
    }
}

public class BaseModelTest {

    PipeGameTest pipeGameTest;

    @Singleton
    @Component(modules = PipeGameTestModule.class)
    public interface PipeGameTest {
        void inject(BoardModelTest boardModelTest);
        void inject(ConveyorModelTest conveyorModelTest);
    }

    @Before
    public void setUp() {
        pipeGameTest = DaggerBaseModelTest_PipeGameTest.create(); // Doesn't work
    }

    public PipeGameTest component() {
        return pipeGameTest;
    }
}

public class BaseModelTest {

    PipeGameApplication.PipeGame pipeGameTest;

    // This works if I make the test module extend
    // the prod module, but it can't inject my test classes
    @Before
    public void setUp() {
        pipeGameTest = DaggerPipeGameApplication_PipeGame.builder().pipeGameModule(new PipeGameModuleTest()).build();
    }

    public PipeGameApplication.PipeGame component() {
        return pipeGameTest;
    }
}

@Module
public class PipeGameTestModule {

    @Provides
    @Singleton
    Random provideRandom() {
        return mock(Random.class);
    }
}

Answer 1

如果没有一些变通方法，这在Dagger2（从V2.0.0开始）中是不可能的。你可以在这里读到。

有关可能的解决方法的详细信息：

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如何用Dagger2.0覆盖单元测试中的模块/依赖项？