I don't know whether my question is really related to Firebase Cloud Functions, but I came across this problem trying to test my Firebase Cloud Functions.
Let's say I have a Firebase Cloud function written in NodeJS:
function.ts
import * as functions from "firebase-functions"
const admin = require("firebase-admin")
import * as authVerifier from "../../auth/authVerifier"
export default functions.https.onRequest(async (req, res) => {
let authId
try {
authId = await authVerifier.identifyClientRequest(req)
} catch (err) {
console.error(`Unauthorized request error: ${err}`)
return res.status(401).send({
error: "Unauthorized request"
})
}
}
Usually I have an interface and can easily mock any class I want to test it.
And, for example, authVerifier looks like:
authVerifier.ts
import * as express from "express"
export async function identifyClientRequest(req: express.Request) {
return true // whatever, it doesn't really matter, should be real logic here
}
I'm trying to test function.ts and I only can pass res and req into it, eg:
function.test.ts
it("should verify client identity", async () => {
const req = {
method: "PUT"
}
const res = { }
await myFunctions(req as express.Request, res as express.Response)
// assert that authVerifier.identifyClientRequest(req) called with passed req
})
So the question is: how can I mock authVerifier.identifyClientRequest(req)
to use different implementations in function.ts and in function.test.ts?
I don't really know NodeJS/TypeScript, so I wonder if I can import another mock class of authVerifier for test or something like that.
Ok, seems like I found the answer. I'll post it here just in case.
Using sinonjs, chai we can stub our class (authVerifier in that case) to return necessary results:
const chai = require("chai")
const assert = chai.assert
const sinon = require("sinon")
import * as authVerifier from "../../../src/auth/authVerifier"
it("should verify client identity", async () => {
const req = {
method: "PUT"
}
const res = mocks.createMockResponse()
const identifyClientRequestStub = sinon.stub(authVerifier, "identifyClientRequest");
const authVerifierStub = identifyClientRequestStub.resolves("UID")
await updateUser(req as express.Request, res as express.Response)
assert.isTrue(authVerifierStub.calledWith(req))
})
And the result is:
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