android - 在 Activity 中注入(inject) ViewModelFactory.Provider 以进行浓缩咖啡测试

Question

与此问题相关:Espresso, Dagger2 set ViemodelProvider.Factory on BaseActivity

在我的测试期间，为了让 espresso 测试在 Android 架构组件上工作，我经历了 hell 并返回到 Activity 上的 ViewModelFactory.Provider。我原以为它很简单，但我想它不是......

使用 fragment 的示例很简单:
https://github.com/googlesamples/android-architecture-components/blob/master/GithubBrowserSample/app/src/androidTest/java/com/android/example/github/ui/user/UserFragmentTest.java

@Before
public void init() {
    UserFragment fragment = UserFragment.create("foo");
    viewModel = mock(UserViewModel.class);
    when(viewModel.getUser()).thenReturn(userData);
    when(viewModel.getRepositories()).thenReturn(repoListData);
    navigationController = mock(NavigationController.class);
    fragmentBindingAdapters = mock(FragmentBindingAdapters.class);

    fragment.viewModelFactory = ViewModelUtil.createFor(viewModel);
    fragment.navigationController = navigationController;
    fragment.dataBindingComponent = () -> fragmentBindingAdapters;

    activityRule.getActivity().setFragment(fragment);
}

但是，这根本不适用于 Activity ，因为我无法在 Activity 创建之前使用 ActivityTestRule 获取 Activity 的依赖项。
我使用 Dagger2 遵循与上面示例中相同的新依赖项注入(inject)流程，使用 HasActivityInjector 接口(interface)。

非常感谢您的帮助!

Answer 1

可以通过在 @Before 方法中的 TestApp 中注册自定义 ActivityLifecycleCallbacks 来设置注入(inject)的 Activity 属性。

例子:

 @Before
public void init(){


    UserFragment fragment = UserFragment.create("foo");
    viewModel = mock(UserViewModel.class);
    when(viewModel.getUser()).thenReturn(userData);
    when(viewModel.getRepositories()).thenReturn(repoListData);
    navigationController = mock(NavigationController.class);


    TestApp testApp = ((TestApp) InstrumentationRegistry.getContext().getApplicationContext());
    testApp.registerActivityLifecycleCallbacks(new Application.ActivityLifecycleCallbacks() {
        @Override
        public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
            //will be called before the onCreate method of your activity
            activity.setViewModelFactory(ViewModelUtil.createFor(viewModel));
        }

        @Override
        public void onActivityStarted(Activity activity) {

        }

        @Override
        public void onActivityResumed(Activity activity) {

        }

        @Override
        public void onActivityPaused(Activity activity) {

        }

        @Override
        public void onActivityStopped(Activity activity) {

        }

        @Override
        public void onActivitySaveInstanceState(Activity activity, Bundle outState) {

        }

        @Override
        public void onActivityDestroyed(Activity activity) {

        }
    });


    fragment.viewModelFactory = ViewModelUtil.createFor(viewModel);
    fragment.navigationController = navigationController;
    fragment.dataBindingComponent = () -> fragmentBindingAdapters;

    activityRule.getActivity().setFragment(fragment);


}