Question

我无法在Typescript中为Firebase Cloud Functions模拟Firebase Messaging函数。我正在使用firebase-functions-test的Companion SDK来构建docs中提到的在线测试。我正在使用笑话模拟来模拟admin.messaging().sendToDevice函数。

const fcmMock = jest.spyOn(admin.messaging(),'sendToDevice');

fcmMock.mockImplementation(async (registrationToken: string | string[], payload: admin.messaging.MessagingPayload, options?: admin.messaging.MessagingOptions)=>{
      console.log('FCM Mock called with message: '+payload.notification+'\nToken ids:'+registrationToken);
      return new Promise<admin.messaging.MessagingDevicesResponse>(undefined);
});

运行此操作会收到以下错误，因为返回类型对象MessagingDevicesResponse>(undefined)需要一个复杂的参数：

类型'undefined'的参数不能分配给类型'（resolve：（value ?: MessagingDevicesResponse | PromiseLike | undefined）=>无效，拒绝：（原因？：任何）=>无效）=>无效'

我要测试的代码：


export async function cleanupToken(response: admin.messaging.MessagingDevicesResponse, userDataSnapshot:FirebaseFirestore.DocumentSnapshot) {
    // For each notification we check if there was an error.
    if(response.results.length>0){
        const error = response.results[0].error;
        if (error) {
            // Cleanup the tokens who are not registered anymore.
            // Error Codes: https://firebase.google.com/docs/cloud-messaging/send-message#admin_sdk_error_reference
            if (error.code === 'messaging/invalid-registration-token' ||
                error.code === 'messaging/registration-token-not-registered') {
                // Some Logic here to cleanup the token and mark the user
                }
            }
        }
    }
}

Answer 1

查看您的代码，有几件事丢失/不正确：

更改jest.spyOn（admin.messaging（），'sendToDevice'）;到jest.spyOn（admin，'sendToDevice'）;

传递模拟对象，在这种情况下为响应和快照

// A fake response object, with a send to test the response
const res = {
      send: (response) => {
          expect(response).toBe("Hello from Firebase!");
          done();
          }
      };

//how to create a datasnapshot. Takes in 2 parameters, the object and the reference path
const userDataSnapshot = test.database.makeDataSnapshot(Object,'ref/to-the/path');

您不会在开玩笑的测试案例中返回诺言，而是使用开玩笑的测试方法（在这种情况下是期望的）。
通常可以在函数中进行笑话测试（在这种情况下是预期的），但是我们在响应中进行测试，因为这是回调，因此它恰好在最后进行。

您的测试用例应如下所示：

describe('testing jest functions',() =>{
  let index,adminStub;


  //setup test enviroment
  beforeAll(() =>{
      adminStub = jest.spyOn(admin, "initializeApp");
      index = require('./index');

      return;
  });

  //tear down
  afterAll(() =>{
    adminStub.mockRestore();
    testEnv.cleanup();
  });

  it('test cleanupToken function', (done) =>{

        const res = {
              send: (response) => {
                    //assuming you use response.send in your actual code you can test it
                  expect(response).toBe("Hello from Firebase!");
                  done();
                  }
              };

        const userDataSnapshot = test.database.makeDataSnapshot(Object,'ref/to-the/path');

      index.cleanupToken(res,userDataSnapshot);
  });

如何在Firebase云功能测试中模拟FCM admin.messaging（）。sendToDevice（）的实现

1 个答案: