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Implement automated testing with Playwright for JupyterLab Desktop snapshots
Co-authored-by: krassowski <[email protected]>
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‎.github/workflows/test.yml‎

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name: Automated Testing
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on:
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push:
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branches: [ master ]
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pull_request:
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branches: [ master ]
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# Allows you to run this workflow manually from the Actions tab
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workflow_dispatch:
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jobs:
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test:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v4
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- name: Install node
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uses: actions/setup-node@v4
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with:
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node-version: '20.x'
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cache: 'yarn'
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- name: Install dependencies
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run: |
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npm install --global yarn --prefer-offline
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yarn install
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- name: Build application
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run: |
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yarn build
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- name: Run tests
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run: |
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xvfb-run -a yarn test
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- name: Upload test results
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uses: actions/upload-artifact@v4
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if: always()
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with:
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name: test-results
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path: |
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test-results/
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tests/snapshots/
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- name: Upload screenshots
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uses: actions/upload-artifact@v4
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if: always()
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with:
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name: screenshots
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path: tests/snapshots/

‎.gitignore‎

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env_installer/jlab_server/
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env_installer/jlab_server.tar.gz
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# Test artifacts
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test-results/
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tests/snapshots/*.png
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playwright-report/
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/test-results/
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/playwright-report/
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/playwright/.cache/

‎package.json‎

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"main": "./build/out/main/main.js",
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"scripts": {
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"start": "electron .",
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"test": "echo \"Error: no test specified\" && exit 1",
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"test": "playwright test",
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"test:headed": "playwright test --headed",
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"test:debug": "playwright test --debug",
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"clean": "rimraf build dist",
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"watch:tsc": "tsc -w",
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"watch:assets": "node ./scripts/extract.js && node ./scripts/copyassets.js watch",
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"base": "core22",
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"environment": {
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"SHELL": "/bin/bash",
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"GTK_USE_PORTAL":"1"
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"GTK_USE_PORTAL": "1"
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},
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"hooks": "build/snap-hooks"
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},
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"license": "BSD-3-Clause",
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"devDependencies": {
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"@jupyter-notebook/web-components": "0.9.1",
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"@leeoniya/ufuzzy": "1.0.14",
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"@playwright/test": "^1.55.0",
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"@types/ejs": "^3.1.0",
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"@types/js-yaml": "^4.0.3",
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"@types/node": "^14.14.31",
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"@types/yargs": "^17.0.18",
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"@typescript-eslint/eslint-plugin": "~5.28.0",
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"@typescript-eslint/parser": "~5.28.0",
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"@leeoniya/ufuzzy": "1.0.14",
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"electron": "^27.0.2",
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"electron-builder": "^24.9.1",
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"electron-notarize": "^1.2.2",
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"meow": "^6.0.1",
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"mini-css-extract-plugin": "^1.3.9",
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"node-watch": "^0.7.4",
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"playwright": "^1.55.0",
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"prettier": "~2.1.1",
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"read-package-tree": "^5.1.6",
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"rimraf": "~3.0.0",

‎playwright.config.ts‎

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import { defineConfig } from '@playwright/test';
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/**
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* @see https://playwright.dev/docs/test-configuration
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*/
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export default defineConfig({
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testDir: './tests',
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/* Run tests in files in parallel */
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fullyParallel: false, // Disable parallel for Electron tests
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/* Fail the build on CI if you accidentally left test.only in the source code. */
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forbidOnly: !!process.env.CI,
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/* Retry on CI only */
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retries: process.env.CI ? 1 : 0,
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/* Opt out of parallel tests on CI. */
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workers: 1, // Use single worker for Electron
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/* Reporter to use. See https://playwright.dev/docs/test-reporters */
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reporter: [
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['html'],
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['json', { outputFile: 'test-results/results.json' }]
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],
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/* Shared settings for all the projects below. See https://playwright.dev/docs/api/class-testoptions. */
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use: {
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/* Collect trace when retrying the failed test. See https://playwright.dev/docs/trace-viewer */
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trace: 'on-first-retry',
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// Increase timeouts for Electron app startup
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actionTimeout: 30000,
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navigationTimeout: 30000,
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},
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/* Global timeout for each test */
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timeout: 60000,
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/* Configure projects for Electron */
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projects: [
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{
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name: 'electron-tests',
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testMatch: '**/*.spec.ts',
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},
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],
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});

‎tests/README.md‎

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# JupyterLab Desktop Tests
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This directory contains automated tests for JupyterLab Desktop using Playwright.
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## Test Structure
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- `welcome-screen.spec.ts` - Tests for the welcome screen and basic app launch
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- `electron-dialogs.spec.ts` - Tests for capturing various Electron dialogs
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- `app-states.spec.ts` - Tests for capturing different application states
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- `helpers/` - Helper utilities for testing
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- `snapshots/` - Generated screenshots (excluded from git)
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## Running Tests
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```bash
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# Run all tests
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yarn test
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# Run tests in headed mode (with visible browser)
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yarn test:headed
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# Run tests in debug mode
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yarn test:debug
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```
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## Test Configuration
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Tests are configured via `playwright.config.ts` in the root directory.
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## CI Integration
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Tests run automatically in CI via `.github/workflows/test.yml` and generate screenshots that are uploaded as artifacts.
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## Requirements
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- Electron app must be built before running tests (`yarn build`)
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- Tests require a virtual display in headless environments (xvfb)
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- Screenshots are captured for visual regression testing

‎tests/app-states.spec.ts‎

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import { test, expect, _electron as electron } from '@playwright/test';
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import * as path from 'path';
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// Helper function to launch electron app
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async function launchElectronApp() {
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return await electron.launch({
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args: [
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path.join(__dirname, '../build/out/main/main.js'),
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'--no-sandbox',
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'--disable-setuid-sandbox',
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'--disable-dev-shm-usage'
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],
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env: {
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...process.env,
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NODE_ENV: 'test',
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SKIP_BUNDLED_ENV_SETUP: 'true'
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}
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});
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}
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test.describe('JupyterLab Desktop UI Testing', () => {
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test('should capture different application states', async () => {
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const electronApp = await launchElectronApp();
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const page = await electronApp.firstWindow();
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// Wait for app to fully load
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await page.waitForTimeout(8000);
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// Capture the initial state - could be welcome screen or main interface
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await page.screenshot({
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path: 'tests/snapshots/app-initial-state.png',
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fullPage: true
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});
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// Try to capture different window states
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// Take a few screenshots with different wait times to capture any dynamic loading
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await page.waitForTimeout(2000);
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await page.screenshot({
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path: 'tests/snapshots/app-state-2.png',
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fullPage: true
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});
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await page.waitForTimeout(3000);
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await page.screenshot({
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path: 'tests/snapshots/app-state-3.png',
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fullPage: true
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});
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expect(page).toBeTruthy();
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await electronApp.close();
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});
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test('should test app dimensions and basic properties', async () => {
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const electronApp = await launchElectronApp();
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const page = await electronApp.firstWindow();
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// Wait for initialization
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await page.waitForTimeout(5000);
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// Get window properties
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const windowBounds = await electronApp.windows()[0].evaluate(() => {
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return {
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width: window.innerWidth,
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height: window.innerHeight,
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title: document.title
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};
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});
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// Take screenshot with window info
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await page.screenshot({
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path: 'tests/snapshots/app-window-properties.png',
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fullPage: true
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});
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expect(windowBounds.width).toBeGreaterThan(0);
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expect(windowBounds.height).toBeGreaterThan(0);
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await electronApp.close();
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});
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test('should capture app in different loading phases', async () => {
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const electronApp = await launchElectronApp();
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const page = await electronApp.firstWindow();
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// Take screenshot immediately after launch
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await page.waitForTimeout(1000);
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await page.screenshot({
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path: 'tests/snapshots/app-early-launch.png',
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fullPage: true
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});
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// Wait a bit more and take another
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await page.waitForTimeout(5000);
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await page.screenshot({
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path: 'tests/snapshots/app-mid-launch.png',
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fullPage: true
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});
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// Final state
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await page.waitForTimeout(10000);
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await page.screenshot({
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path: 'tests/snapshots/app-fully-loaded.png',
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fullPage: true
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});
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expect(page).toBeTruthy();
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await electronApp.close();
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});
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});

‎tests/electron-dialogs.spec.ts‎

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import { test, expect, _electron as electron } from '@playwright/test';
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import * as path from 'path';
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// Helper function to launch electron app
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async function launchElectronApp() {
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return await electron.launch({
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args: [
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path.join(__dirname, '../build/out/main/main.js'),
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'--no-sandbox',
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'--disable-setuid-sandbox',
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'--disable-dev-shm-usage'
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],
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env: {
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...process.env,
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NODE_ENV: 'test',
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SKIP_BUNDLED_ENV_SETUP: 'true'
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}
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});
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}
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test.describe('Electron Dialogs Screenshots', () => {
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test('should capture app with notebook', async () => {
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const electronApp = await launchElectronApp();
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const page = await electronApp.firstWindow();
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// Wait for app to load
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await page.waitForTimeout(5000);
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// Try to create a new notebook (this might open in the lab view)
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// We'll capture whatever state the app is in
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await page.screenshot({
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path: 'tests/snapshots/app-with-notebook.png',
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fullPage: true
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});
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expect(page).toBeTruthy();
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await electronApp.close();
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});
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test('should test application launch and basic functionality', async () => {
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const electronApp = await launchElectronApp();
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const page = await electronApp.firstWindow();
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// Wait for initialization
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await page.waitForTimeout(3000);
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// Take screenshot of main window
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await page.screenshot({
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path: 'tests/snapshots/main-window.png',
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fullPage: true
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});
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// Check that the page exists and is visible
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expect(page).toBeTruthy();
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const isVisible = await page.isVisible('body');
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expect(isVisible).toBe(true);
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await electronApp.close();
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});
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});

‎tests/snapshots/README.md‎

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# Screenshots directory for automated testing
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This directory contains screenshots generated by automated tests.
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The screenshots are generated during CI runs and capture:
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- Welcome screen
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- App states during loading
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- App with notebook interface
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- Various dialog windows
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Screenshots are excluded from git tracking via .gitignore but are uploaded as CI artifacts.

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