java - 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 View 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，所以我不知道真实的数据以及哪个 View 应该显示，哪个 View 不应该显示。结果，我不知道如何继续我的测试。谁能告诉我如何处理这种情况？谢谢!

Answer 1

尝试使用MockWebServer图书馆。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);


    }