Dagger 2 生成的测试组件无法识别 [英] Dagger 2 generated test component not recognized

问题描述

我希望这只是我在这里做错了.我正在尝试使用 Dagger 2.0 为我的 JUnit 测试(不是 Espresso 测试，只是纯 JUnit)注入依赖项.所以，我有一个主"Java 模块和一个测试"Java 模块.在主模块中，我有一个 Dagger 模块和一个组件:

I'm hoping that this is just something I'm doing wrong here. I'm trying to use Dagger 2.0 to inject dependencies for my JUnit tests (not Espresso tests, just pure JUnit). So, I have a 'main' java module and a 'test' java module. In the main module, I've got a Dagger Module and a Component:

@Module
public class MainModule {
    @Provides
    public Widget provideWidget() {
        return new ConcreteWidget();
    }
}

...

@Component (modules = MainModule.class)
public interface MainComponent {
    void inject(WidgetConsumer consumer);
}

在我的测试模块中，我有以下内容:

And in my test module, I have the following:

@Module
public class TestModule {
    @Provides public Widget provideWidget() {
        return new Widget() {
            @Override
            public void doThing() {
                int y = 6;
                y ++;
            }
        };
    }
}

...

@Component(modules = TestModule.class)
public interface TestComponent extends MainComponent{
}

我的 build.gradle 具有如下所示的依赖项:

My build.gradle has dependencies that look like this:

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:25.2.0'
    testCompile 'junit:junit:4.12'

    compile 'com.google.dagger:dagger:2.9'
    testCompile 'com.google.dagger:dagger:2.9'

    annotationProcessor 'com.google.dagger:dagger-compiler:2.9'
    testAnnotationProcessor 'com.google.dagger:dagger-compiler:2.9'
}

无论什么原因，Dagger 生成了 DaggerMainComponent，但拒绝生成 DaggerTestComponent.构建时，gradle 输出中似乎没有错误.

For whatever reason, Dagger generates DaggerMainComponent, but refuses to generate DaggerTestComponent. There appear to be no errors in the gradle output when I build.

事情就是这样...我认为注释处理器正在运行，但不知何故，android gradle 插件无法在编译时提取那些生成的源代码.我检查了 app/build/generated/source/apt/test/目录并在其中找到了 DaggerTestComponent.java，但由于某种原因，它没有作为依赖项导入.

Here's the thing... I think the annotation processor is running, but somehow the android gradle plugin is failing to pull in those generated sources during compile-time. I have inspected the app/build/generated/source/apt/test/ directory and found DaggerTestComponent.java in there, but for some reason, it's not imported as a dependency.

有什么想法吗?这是显示我的问题的测试项目的链接

推荐答案

在 android DSL 之后添加这个到 build.gradle:

Add this to build.gradle after android DSL:

android {
    ...
}

android.applicationVariants.all {
    def aptOutputDir = new File(buildDir, "generated/source/apt/${it.unitTestVariant.dirName}")
    it.unitTestVariant.addJavaSourceFoldersToModel(aptOutputDir)
}

此后，您的测试组件将被识别.

Thereafter, your test component would be recognized.

对于 Kotlin，将 generated/source/apt/... 替换为 generated/source/kapt/...

For Kotlin replace generated/source/apt/... with generated/source/kapt/...

跟踪器中存在与此相关的一个问题.

There is an issue raised in the tracker concerning this.

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