在 Android 中使用假 http 响应测试 Activity

Question

我有一个 Activity 用于 registration.The Activity 获取用户的个人资料，例如电子邮件和密码，然后将这些值上传到 server.The 服务器 return成功后将这些值设为 Activity，以便 Activity 将它们保存到 SharedPreferences。
我的问题是，如何编写一个 return 假响应的测试，以便 Activity 不必与真实服务器交互，并检查值是否已准确保存到首选项？

这是我的 Activity:

public class RegisterActivity extends AppCompatActivity implements RegisterRestClientUsage.RegisterCallback{
    private RegisterRestClientUsage registerRestClientUsage;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);
        registerRestClientUsage = new RegisterRestClientUsage(this);
        //...
    }
    public void onClick(View view){
        String email = emailEditText.getText().toString();
        String password = passwordEditText.getText().toString();
        registerRestClientUsage.registerToServer(email,password);
    }
    @Override
    public void registerSuccess(String token, String email) {

        //Save those values to SharedPreferences

        finish();
    }

    @Override
    public void registerFail() {
        finish();
    }
}

RegisterClientUsage.class

public class RegisterRestClientUsage {
    private RegisterCallback callback;
    public interface RegisterCallback{
        void registerSuccess(String token,String email);
        void registerFail();
    }

    public RegisterRestClientUsage(RegisterCallback r){
        callback = r;
    }
    public void registerToServer(String email,String password){
            RequestParams params = new RequestParams();
            params.put("email", email);
            params.put("password", password);

            BaseRestClient.post("api/users/sign_up", params, new AsyncHttpResponseHandler() {
                @Override
                public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
                    try {
                        JSONObject responseJson = new JSONObject(new String(responseBody));
                        returnToken = responseJson.optString("token");
                        JSONObject userJson = responseJson.optJSONObject("user");
                        returnEmail = userJson.optString("email");
                        callback.registerSuccess(returnToken,returnEmail);
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }

                @Override
                public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) {
                    callback.registerFail();
                }
            });
    }
}

BaseRestClient.class

public class BaseRestClient {
    public static final String BASE_URL =  "https://my.api.com/";
    private static AsyncHttpClient client = new AsyncHttpClient();

    public static void post(String url, RequestParams params, AsyncHttpResponseHandler responseHandler) {
        client.post(getAbsoluteUrl(url), params, responseHandler);
    }

}

由于 RegisterRestClientUsage 嵌入在 RegisterActivity 中，我找不到将我的假服务器注入 Activity 的好方法。

Answer 1

感谢@geek90 的帮助，我终于想出了一个 solution.I 用另一个控制器（RegisterController.class）包装我真正的 api 实现（RegisterRestClientUsage.class）：

public class RegisterController{

    private RegisterServer serverSide;

    public RegisterController(RegisterServer r){
        serverSide = r;
    }

    public void registerToServer(String email,String password) {
        RequestParams params = new RequestParams();
        params.put("email", email);
        params.put("password", password);
        serverSide.registerToServer(params);
    }
}

让RegisterRestClientUsage.class实现RegisterServer接口：

public interface RegisterServer{
    void registerToServer(String email,String  pwd);
}

并且在RegisterActivity的onCreate()方法中，用参数RegisterRestClientUsage构建控制器

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_register);
    registerController = new RegisterController(new RegisterRestClientUsage(this));
    //...
}

在这种情况下，我可以将 api 的假实现存根到控制器中进行测试：

@RunWith(AndroidJUnit4.class)
public class RegisterActivityTest {
    FakeRegisterRestClientUsage fakeRegisterRestClientUsage;
    @Rule
    public ActivityTestRule<RegisterActivity> activityTestRule = new ActivityTestRule<>(RegisterActivity.class);
    @Before
    public void setUp(){
        Activity activity = activityTestRule.getActivity();
        fakeRegisterRestClientUsage = new FakeRegisterRestClientUsage((RegisterRestClientUsage.RegisterCallback) activity);
        registerController = new RegisterController(fakeRegisterRestClientUsage);
    }
    @Test
    public void savePreferenceAfterRegistration(){
        activity.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                registerController.registerToServer("FAKE_NAME", "FAKE_BIRTH", "FAKE_EMAIL", "FAKE_GENDER", "FAKE_PWD", file);
            }
        });
        waitForActionsToComplete();

        //Assert that the data has been properly save to the preferences
    }
    public void waitForActionsToComplete(){
        CountDownLatch signal = fakeRegisterRestClientUsage.signal;
        try {
            signal.await(30, TimeUnit.SECONDS);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

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