Utilities and cli to help testing Firebase projects with Cypress
- Test environment config generation (including custom auth token) with
createTestEnvFile
- Custom cypress commands for auth and database interactions:
If you are intereted in what drove the need for this checkout the why section
Note: Skip cypress install if it already exists within your project
- Log into your Firebase console for the first time.
- Go to Auth tab of Firebase and create a user for testing porpuse
- Get the UID of created account. This will be the account which you use to login while running tests (we will call this UID
TEST_UID
) - Go to project setting on firebase console and generate new private key. See how to do here
- Save the downloaded file as
serviceAccount.json
in the root of your project (for local dev) - Set service account as the
SERVICE_ACCOUNT
environment variable within your CI (make sure to wrap it in"
) - Install Cypress and add it to your package file:
npm i --save-dev cypress
- Add cypress folder by calling
cypress open
Note: These instructions assume your tests are in the cypress
folder (cypress' default). See the folders section below for more info about other supported folders.
-
Make sure you have
firebase-tools
installed (globally or within project). It is used to call to database when usingcy.callRtdb
andcy.callFirestore
. -
Install using
npm i cypress-firebase --save-dev
-
Add the following to the
scripts
section of yourpackage.json
:"build:testConfig": "cypress-firebase createTestEnvFile", "test": "npm run build:testConfig cypress run", "test:open": "npm run build:testConfig cypress open", "test:stage": "npm run test -- --env envName=stage", "test:open:stage": "npm run test:open -- --env envName=stage"
Environment variables can be passed through
--env
.envName
points to the firebase project within the projects section of.firebaserc
. -
Add your config info to
cypress/config.json
{ "TEST_UID": "<- uid of the user you want to test as ->", "FIREBASE_PROJECT_ID": "<- projectId of your project ->", "FIREBASE_API_KEY": "<- browser apiKey of your project ->" }
-
Add the following your custom commands file (
cypress/support/commands.js
):import firebase from 'firebase/app'; import 'firebase/auth'; import 'firebase/database'; import 'firebase/firestore'; import { attachCustomCommands } from 'cypress-firebase'; const fbConfig = { // Your config from Firebase Console }; firebase.initializeApp(fbConfig); attachCustomCommands({ Cypress, cy, firebase })
-
Setup plugin adding following your plugins file (
cypress/plugins/index.js
):const cypressFirebasePlugin = require('cypress-firebase').plugin module.exports = (on, config) => { // `on` is used to hook into various events Cypress emits // `config` is the resolved Cypress config // Return extended config (with settings from .firebaserc) return cypressFirebasePlugin(config) }
The plugin sets
baseUrl
and loads config from.firebaserc
- Start your local dev server (usually
npm start
) - for faster alternative checkout the test built version section - Open cypress test running by running
npm run test:open
in another terminal window
Tests will run faster locally if you tests against the build version of your app instead of your dev version (with hot module reloading and other dev tools). You can do that by:
-
Adding the following npm script:
"start:dist": "npm run build && firebase serve --only hosting -p 3000",
-
Run
npm run start:dist
to build your app and serve it with firebase -
In another terminal window, run a test command such as
npm run test:open
- Run
firebase login:ci
to generate a CI token forfirebase-tools
(this will give yourcy.callRtdb
andcy.callFirestore
commands admin access to the DB) - Set
FIREBASE_TOKEN
within CI environment variables
cypress
is the default folder where config is loaded from, but you can use another folder by specifiying a different setting for the integrationFolder
parameter in cypress.json
:
{
"projectId": "<- your project id ->",
"fixturesFolder": "test/e2e/fixtures",
"integrationFolder": "test/e2e/integration",
"pluginsFile": "test/e2e/plugins/index.js",
"screenshotsFolder": "test/e2e/screenshots",
"videosFolder": "test/e2e/videos",
"supportFile": "test/e2e/support/index.js"
}
Create test environment file (cypress.env.json
) which contains custom auth token generated using firebase-admin
SDK and serviceAccount.json
.
A service account must be provided. This can be done by setting serviceAccount.json
in the root of the project (often used locally since service accounts should be in gitignore), or by setting the SERVICE_ACCOUNT
enviroment variable. For different environmets you can prefix with the environment name such as STAGE_SERVICE_ACCOUNT
.
cypress-firebase createTestEnvFile
Login to Firebase auth using FIREBASE_AUTH_JWT
environment variable
which is generated using firebase-admin
authenticated with serviceAccount
during build:testConfig
phase.
cy.login()
//Assuming there's a uid property at the root level of the user object.
cy.login().then($auth => cy.wrap($auth).its('uid').as('uid'));
//Then, later somewhere in the test, use the uid like this,
cy.get('@uid').then((uid) => {
//Your code here.
}
Log out of Firebase instance
cy.logout()
Call Real Time Database path with some specified action. Authentication is through FIREBASE_TOKEN
since firebase-tools is used (instead of firebaseExtra).
action
String The action type to call with (set, push, update, remove)actionPath
String Path within RTDB that action should be appliedopts
Object Optionsopts.args
Array Command line args to be passed
Set data
const fakeProject = { some: 'data' }
cy.callRtdb('set', 'projects/ABC123', fakeProject)
Set Data With Meta
const fakeProject = { some: 'data' }
// Adds createdAt and createdBy (current user's uid) on data
cy.callRtdb('set', 'projects/ABC123', fakeProject, { withMeta: true })
Get/Verify Data
cy.callRtdb('get', 'projects/ABC123')
.then((project) => {
// Confirm new data has users uid
cy.wrap(project)
.its('createdBy')
.should('equal', Cypress.env('TEST_UID'))
})
Other Args
const opts = { args: ['-d'] }
const fakeProject = { some: 'data' }
cy.callRtdb('update', 'project/test-project', fakeProject, opts)
Call Firestore instance with some specified action. Authentication is through serviceAccount.json since it is at the base level. If using delete, auth is through FIREBASE_TOKEN since firebase-tools is used (instead of firebaseExtra).
action
String The action type to call with (set, push, update, remove)actionPath
String Path within RTDB that action should be appliedopts
Object Optionsopts.args
Array Command line args to be passed
Basic
cy.callFirestore('set', 'project/test-project', 'fakeProject.json')
Recursive Delete
const opts = { recursive: true }
cy.callFirestore('delete', 'project/test-project', opts)
Other Args
const opts = { args: ['-r'] }
cy.callFirestore('delete', 'project/test-project', opts)
Full
describe('Test firestore', () => {
const TEST_UID = Cypress.env('TEST_UID');
const mockAge = 8;
beforeEach(() => {
cy.visit('http://localhost:4200');
});
it('read/write test', () => {
cy.log('Starting test');
cy.callFirestore('set', `testCollection/${TEST_UID}`, {
name: 'axa',
age: 8,
});
cy.callFirestore('get', `testCollection/${TEST_UID}`).then(r => {
cy.wrap(r[0])
.its('id')
.should('equal', TEST_UID);
cy.wrap(r[0])
.its('data.age')
.should('equal', mockAge);
});
cy.log('Ended test');
});
});
It isn't currently possible to use Firebase's firebase-admin
SDK directly within Cypress due to dependencies not being able to be loaded into the Browser environment. Since firebase-admin
is nessesary to generate custom token needed to login to Firebase, the usage of it happens outside of Cypress (through cypress-firebase createTestEnvFile
) before booting up.
Instead of a cli tool, the plugin that is include could maybe use firebase-admin
(since cypress plugins is a node environment) - when investigating this, I found it frustrating to get the values back into the test. That said, always open to better ways of solving this, so please reach out with your ideas!
fireadmin.io - A Firebase project management tool (here is the source)
- Fix issue where auth token goes bad after test suite has been open a long time