在 android 中使用 Espresso 的正确方法是什么？

Question

我正在尝试为我的 Android 应用程序运行 Espresso 测试，但有一个问题一直困扰着我。在 MainActivity 中，某些视图的可见性取决于从网络加载的数据，但在 MainActivityTest 中，我无法操纵加载数据的过程，因此我不知道真实数据以及应该显示哪个视图以及不应该显示哪个视图。结果，我不知道如何继续我的测试。任何人都可以告诉我如何处理这种情况？谢谢！

Answer 1

尝试使用MockWebServer 库。它允许您在测试中模拟 http 响应，如下所示：

     /**
     * Constructor for the test.  Set up the mock web server here, so that the base
     * URL for the application can be changed before the application loads
     */
    public MyActivityTest() {
        MockWebServer server = new MockWebServer();
        try {
            server.start();
        } catch (IOException e) {
            e.printStackTrace();
        }
        //Set the base URL for the application
        MyApplication.sBaseUrl = server.url("/").toString();


        //Create a dispatcher to handle requests to the mock web server
        Dispatcher dispatcher = new Dispatcher() {

            @Override
            public MockResponse dispatch(RecordedRequest recordedRequest) throws InterruptedException {
            try {
                //When the activity requests the profile data, send it this
                if(recordedRequest.getPath().startsWith("/users/self")) {
                    String fileName = "profile_200.json";
                    InputStream in = this.getClass().getClassLoader().getResourceAsStream(fileName);
                    String jsonString = new String(ByteStreams.toByteArray(in));
                    return new MockResponse().setResponseCode(200).setBody(jsonString);
                }
                //When the activity requests the image data, send it this
                if(recordedRequest.getPath().startsWith("/users/self/media/recent")) {
                    String fileName = "media_collection_model_test.json";
                    InputStream in = this.getClass().getClassLoader().getResourceAsStream(fileName);
                    String jsonString = new String(ByteStreams.toByteArray(in));
                    return new MockResponse().setResponseCode(200).setBody(jsonString);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }

            return new MockResponse().setResponseCode(404);
            }
        };
        server.setDispatcher(dispatcher);


    }