nodejs unit test PubSub.publish not sending data - node.js

Question

I'm having issues doing a unit test with the following environment:
"pubsub-js": "^1.9.2",
"#types/chai": "^4.2.14",
"#types/mocha": "^8.2.0",
"chai": "^4.2.0",
"firebase-functions-test": "^0.2.3",
"mocha": "^8.2.1",
"ts-node": "^9.1.1",
"ts-sinon": "^2.0.1",
When publish a message to my pubsub the data received by it is always: Message { data: undefined, attributes: {}, _json: undefined } and I can't figure out why.
There is some code to describe my scenario:
pubsub-myFunc.ts
export const pubsubMyFunc= functions.pubsub
.topic("on-myTopic")
.onPublish(async (message) => {
console.log("version 1")
console.log(message)
/**
* Received message from topic
*/
const myMessage = Buffer.from(message.data, "base64").toString("utf-8")
pubsub-myFunc.spec.ts
import * as functions from 'firebase-functions';
import * as PubSub from 'pubsub-js';
import * as tsSinon from 'ts-sinon';
import { pubsubMyFunc } from './pubsub-myFuncr';
import * as sendEmail from './send-mail';
describe("PubSub tests", () => {
beforeEach(() => {
process.env.GCLOUD_PROJECT = "my env"
})
it("Should call sendNotificationMessage", function (done) {
// this.timeout(60000)
const today = new Date()
const data = {
dateCreated: today,
expireDate: today.getDate() + 30,
objId: "id",
objParentId: "parentId",
}
const spy = tsSinon.default.spy(sendEmail, "sendNotificationMessage")
const dataBuffer = Buffer.from(JSON.stringify(data))
const pubsubMessage = new functions.pubsub.Message(dataBuffer)
PubSub.subscribe("on-myTopic", pubsubMyFunc)
console.log("publish")
PubSub.publish("on-myTopic", pubsubMessage)
setTimeout(() => {
// check if spy was called
tsSinon.default.assert.calledOnce(spy)
done()
}, 15000)
})
})
I have tried to pass directly the dataBuffer but without any luck as well, the outputs of my console logs are:
publish
version 1
Message { data: undefined, attributes: {}, _json: undefined }
Is there any reason for my Message.data to be undefined?

Answer 1

I'm not sure if pubsub-js's subscribe function is compatible with the output of firebase-functions' onPublish method.
You could use firebase's emulators to run your functions locally and test them by sending messages like you would normally instead of going through pubsub-js.
export const pubsubMyFunc= functions.pubsub
.topic("on-myTopic")
.onPublish(async (message) => {
console.log("version 1");
console.log(message);
/**
* Received message from topic
*/
const myMessage = message.json;
...
Make sure pubsubMyFunc is being exported at firebase functions entry point.
Install and configure firebase emulators, make sure PUBSUB_EMULATOR_HOST env var is set to localhost:$PORT where $PORT is set to the port you have configured for pub sub emulator, located in firebase.json under emulators.pubsub.port.
Once that's all setup, you can send a message to pubsub by:
import {PubSub} from "#google-cloud/pubsub";
cont getTopic = () => {
const topic = new PubSub().topic("on-myTopic");
topic.exists().then(([exists]) => exists
? topic
: topic.create().then(([newTopic]) => newTopic)
);
};
describe("PubSub tests", () => {
let topic;
beforeEach(async() => {
process.env.GCLOUD_PROJECT = "my env"
topic = await getTopic();
});
it("should test something", async() => {
await topic.publishJSON(const data = {
dateCreated: today,
expireDate: today.getDate() + 30,
objId: "id",
objParentId: "parentId",
});
// rest of your code here.
});
});

Answer 2

This will work on the process of hack
export const pubsubMyFunc= functions.pubsub
.topic("on-myTopic")
.onPublish(async (message) => {
console.log("version 1");