回调改造中的单元测试 [英] Unit Testing in Retrofit for Callback

问题描述

在这里，我得到了演示者中的代码示例.如何在改造调用中为 onSuccess 和 onFailure 编写测试

Here i got a sample of code in presenter. How do i make write a test for onSuccess and onFailure in retrofit call

public void getNotifications(final List<HashMap<String,Object>> notifications){

        if (!"".equalsIgnoreCase(userDB.getValueFromSqlite("email",1))) {
            UserNotifications userNotifications =
                    new UserNotifications(userDB.getValueFromSqlite("email",1),Integer.parseInt(userDB.getValueFromSqlite("userId",1).trim()));
            Call call = apiInterface.getNotifications(userNotifications);
            call.enqueue(new Callback() {
                @Override
                public void onResponse(Call call, Response response) {
                    UserNotifications userNotifications1 = (UserNotifications) response.body();


                    if(userNotifications1.getNotifications().isEmpty()){
                        view.setListToAdapter(notifications);
                        onFailure(call,new Throwable());
                    }
                    else {
                        for (UserNotifications.Datum datum:userNotifications1.getNotifications()) {
                            HashMap<String,Object> singleNotification= new HashMap<>();
                            singleNotification.put("notification",datum.getNotification());
                            singleNotification.put("date",datum.getDate());
                            notifications.add(singleNotification);
                        }
                        view.setListToAdapter(notifications);
                    }
                }

                @Override
                public void onFailure(Call call, Throwable t) {
                    call.cancel();
                }
            });
        }
    }

}

我如何编写单元测试来涵盖这段代码的所有情况.

How do i write unittesting to cover all cases for this piece of code.

谢谢

推荐答案

当您想测试来自服务 (API) 的不同响应时，最好模拟它并返回您需要的内容.

When you want to test different responses from service (API) it's probably best to mock it and return what you need.

    @Test
    public void testApiResponse() {
      ApiInterface mockedApiInterface = Mockito.mock(ApiInterface.class);
      Call<UserNotifications> mockedCall = Mockito.mock(Call.class);

      Mockito.when(mockedApiInterface.getNotifications()).thenReturn(mockedCall);

      Mockito.doAnswer(new Answer() {
        @Override
        public Void answer(InvocationOnMock invocation) throws Throwable {
          Callback<UserNotifications> callback = invocation.getArgumentAt(0, Callback.class);

          callback.onResponse(mockedCall, Response.success(new UserNotifications()));
          // or callback.onResponse(mockedCall, Response.error(404. ...);
          // or callback.onFailure(mockedCall, new IOException());

          return null;
        }
      }).when(mockedCall).enqueue(any(Callback.class));

      // inject mocked ApiInterface to your presenter
      // and then mock view and verify calls (and eventually use ArgumentCaptor to access call parameters)
    }

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