android - 如何覆盖 Robolectric 运行时依赖库 URL？

Question

我们正在尝试使用我们自己的内部 Nexus 存储库中的 org.robolectric:robolectric:3.0 依赖项。问题是 Robolectric 尝试在运行时从公共(public)存储库 ( as mentioned here ) 加载一些依赖项，并忽略 build.gradle 中的任何存储库覆盖。

由于我们无法从内部网访问该公共(public)位置，因此我的测试在尝试加载该依赖项后超时:

[WARNING] Unable to get resource 'org.robolectric:android-all:jar:5.0.0_r2-robolectric-1' from repository sonatype (https://oss.sonatype.org/content/groups/public/): Error transferring file: Operation timed out

Robolectric configuration documentation 的底部建议将此添加到您的 Gradle 配置以覆盖 URL:

android {
  testOptions {
    unitTests.all {
      systemProperty 'robolectric.dependency.repo.url', 'https://local-mirror/repo'
      systemProperty 'robolectric.dependency.repo.id', 'local'
    }
  }
}

不幸的是，我已经对此进行了测试，但我从未看到该系统属性被设置。我已经从我的自定义 Robolectric runner(它扩展了 RobolectricGradleTestRunner)中打印出来，并且该系统属性仍然设置为 null。

System.out.println("robolectric.dependency.repo.url: " + System.getProperty("robolectric.dependency.repo.url"));

我也尝试做类似 this comment 的事情(但在 RobolectricGradleTestRunner 中不存在可覆盖的方法)，而且我还尝试直接在我的自定义 Robolectric runner 中设置系统属性，但这似乎没有帮助。

@Config(constants = BuildConfig.class)
public class CustomRobolectricRunner extends RobolectricGradleTestRunner {
    private static final String BUILD_OUTPUT = "build/intermediates";

    public CustomRobolectricRunner(Class<?> testClass) throws InitializationError {
        super(testClass);

        System.setProperty("robolectric.dependency.repo.url", "https://nexus.myinternaldomain.com/content");
        System.setProperty("robolectric.dependency.repo.id", "internal");

        System.out.println("robolectric.dependency.repo.url: " + System.getProperty("robolectric.dependency.repo.url"));
    }

Robolectric source code似乎确实证实了这些系统属性的存在。

Answer 1

虽然不是直接使用属性的修复方法，但另一种方法是在 RobolectricTestRunner 子类中覆盖 getJarResolver() 并将其指向您的 Artifact 主持人:

public final class MyTestRunner extends RobolectricTestRunner {
  public MyTestRunner(Class<?> testClass) throws InitializationError {
    super(testClass);
  }

  @Override protected DependencyResolver getJarResolver() {
    return new CustomDependencyResolver();
  }

  static final class CustomDependencyResolver implements DependencyResolver {
    private final Project project = new Project();

    @Override public URL[] getLocalArtifactUrls(DependencyJar... dependencies) {
      DependenciesTask dependenciesTask = new DependenciesTask();
      RemoteRepository repository = new RemoteRepository();
      repository.setUrl("https://my-nexus.example.com/content/groups/public");
      repository.setId("my-nexus");
      dependenciesTask.addConfiguredRemoteRepository(repository);
      dependenciesTask.setProject(project);
      for (DependencyJar dependencyJar : dependencies) {
        Dependency dependency = new Dependency();
        dependency.setArtifactId(dependencyJar.getArtifactId());
        dependency.setGroupId(dependencyJar.getGroupId());
        dependency.setType(dependencyJar.getType());
        dependency.setVersion(dependencyJar.getVersion());
        if (dependencyJar.getClassifier() != null) {
          dependency.setClassifier(dependencyJar.getClassifier());
        }
        dependenciesTask.addDependency(dependency);
      }
      dependenciesTask.execute();

      @SuppressWarnings("unchecked")
      Hashtable<String, String> artifacts = project.getProperties();
      URL[] urls = new URL[dependencies.length];
      for (int i = 0; i < urls.length; i++) {
        try {
          urls[i] = Util.url(artifacts.get(key(dependencies[i])));
        } catch (MalformedURLException e) {
          throw new RuntimeException(e);
        }
      }
      return urls;
    }

    @Override public URL getLocalArtifactUrl(DependencyJar dependency) {
      URL[] urls = getLocalArtifactUrls(dependency);
      if (urls.length > 0) {
        return urls[0];
      }
      return null;
    }

    private String key(DependencyJar dependency) {
      String key =
          dependency.getGroupId() + ":" + dependency.getArtifactId() + ":" + dependency.getType();
      if (dependency.getClassifier() != null) {
        key += ":" + dependency.getClassifier();
      }
      return key;
    }
  }
}

需要注意的是，这依赖于 Robolectric 的两个内部类，因此在升级版本时应格外小心。