Example of how to test auth triggers

Hi, now that we have the auth emulator, it would be nice to have an example test that showcases how to work with the auth emulator on the test suit. I’ve been trying to get this to work, without success.

const firebase = require('@firebase/testing');

// Project id passed by emulators:exec.
const PROJECT_ID = process.env.GCLOUD_PROJECT;
const CREDS = { uid: TEST_USER_ID };

// To get a logged in user pass the CREDS object as param, or null for unauthenticated requests.
const getDB = (creds) => firebase.initializeTestApp({ projectId: PROJECT_ID, auth: creds }).firestore();

// Admin tool to bypass rules and generate data in the db.
const admin = firebase.initializeAdminApp({ projectId: PROJECT_ID });
const getAdminDB = () => admin.firestore();
const getAuth = () => admin.auth();

describe("The cloud functions backend", () => {

    describe("when a user is created", () => {

        it("populates some fields for that user document", async () => {
            const admin = getAdminDB();
            const auth = getAuth();
            const phone = "[phone]";
            const photo = "https://foo.bar";

            const user = await auth.createUser({ phoneNumber: phone, photoURL: photo, uid: "123" });
            const userRef = admin.collection("users").doc("123");

            await new Promise((resolve) => {
                unsubscribe = userRef.onSnapshot(snap => {
                    const { phoneNumber, photoURL } = snap.data();
                    expect(phoneNumber).to.eq(phone);
                    expect(photoURL).to.eq(photo);
                    unsubscribe();
                    resolve();
                });
            });
        });

    });

});

The error is:

Your API key is invalid, please check you have copied it correctly.

Could it be that the FIREBASE_AUTH_EMULATOR_HOST is not being set by firebase emulators:exec? and need to be specified explicitly? Like: auth().useEmulator("localhost:9099")?

Appreciate some ideas on how to troubleshoot or some code snippets that use the auth emulator in tests. Thanks!

[samtstern]

@hernantz I feel like you’re exactly one step ahead of me! You’re running into two bugs that I am working on today:

1. FIREBASE_AUTH_EMULATOR_HOST missing in emulators:exec - https://github.com/firebase/firebase-tools/pull/2800
2. firebase-admin requires credentials for auth operations even when talking to the emulator - https://github.com/firebase/firebase-admin-node/pull/1085

The good news is they should be fairly simple to workaround until I fix them:

1. Set the env var yourself
2. Run gcloud auth application-default login on your development machine

[samtstern]

@hernantz thanks for following up! Glad to hear this was solved. I’ll add an auth example to this repo now.