team/e2e-tests/playwright/lib

@mattermost/playwright-lib

A comprehensive end-to-end testing library for Mattermost web, desktop and plugin applications using Playwright.

Overview

This library provides:

• Pre-built page objects and components for common Mattermost UI elements
• Server configuration and initialization utilities
• Test fixtures and helpers
• Visual testing support with Percy integration
• Accessibility testing support with axe-core
• Browser notification mocking
• File handling utilities
• Common test actions and assertions

Installation

npm install @mattermost/playwright-lib

Peer Dependencies

This library requires @playwright/test version 1.55.0 or higher:

npm install @playwright/test@^1.55.0

Usage

Basic example of logging in and posting a message:

import {test, expect} from '@mattermost/playwright-lib';

test('user can post message', async ({pw}) => {
    // # Create and login a new user
    const {user} = await pw.initSetup();
    const {channelsPage} = await pw.testBrowser.login(user);

    // # Navigate and post a message
    await channelsPage.goto();
    const message = 'Hello World!';
    await channelsPage.postMessage(message);

    // * Verify message appears
    const lastPost = await channelsPage.getLastPost();
    await expect(lastPost).toHaveText(message);
});

Key Components

Page Objects

Ready-to-use page objects for common Mattermost pages:

• Login
• Signup
• Channels
• System Console
• And more...

UI Components

Reusable component objects for UI elements:

• Headers
• Posts
• Menus
• Modals
• And more...

Test Utilities

Helper functions for common testing needs:

• Server setup and configuration
• User/team creation
• File handling
• Visual testing
• And more...

Configuration

The library can be configured via optional environment variables:

Environment Variables

All environment variables are optional with sensible defaults.

Server Configuration

Variable	Description	Default
PW_BASE_URL	Server URL	http://localhost:8065
PW_ADMIN_USERNAME	Admin username	sysadmin
PW_ADMIN_PASSWORD	Admin password	Sys@dmin-sample1
PW_ADMIN_EMAIL	Admin email	[email protected]
PW_ENSURE_PLUGINS_INSTALLED	Comma-separated list of plugins to install	[]
PW_RESET_BEFORE_TEST	Reset server before test	false

High Availability Cluster Settings

Variable	Description	Default
PW_HA_CLUSTER_ENABLED	Enable HA cluster	false
PW_HA_CLUSTER_NODE_COUNT	Number of cluster nodes	2
PW_HA_CLUSTER_NAME	Cluster name	mm_dev_cluster

Push Notifications

Variable	Description	Default
PW_PUSH_NOTIFICATION_SERVER	Push notification server URL	https://push-test.mattermost.com

Playwright Settings

Variable	Description	Default
PW_HEADLESS	Run tests headless	true
PW_SLOWMO	Add delay between actions in ms	0
PW_WORKERS	Number of parallel workers	1

Visual Testing

Variable	Description	Default
PW_SNAPSHOT_ENABLE	Enable snapshot testing	false
PW_PERCY_ENABLE	Enable Percy visual testing	false

CI Settings

Variable	Description	Default
CI	Set automatically in CI environments	N/A

Testcontainers

Selects testcontainers mode — Playwright brings up the server + dependencies itself via Testcontainers — instead of the external mode default, which expects a server already running at PW_BASE_URL.

Variable	Description	Default
PW_USE_TESTCONTAINERS	Selects testcontainers mode	false
PW_TESTCONTAINERS_SERVICES	Comma-separated additional services to start (openldap, keycloak, elasticsearch, opensearch, minio, azurite); unset/empty starts none (core: Postgres, Inbucket, Mattermost)	none (empty)
PW_TESTCONTAINERS_WEBHOOK	Start the webhook sidecar (true to enable)	false
PW_TESTCONTAINERS_REUSE	Reuse containers across repeated local runs instead of recreating them; tear down with npm run testcontainers:down (requires testcontainers.reuse.enable=true in ~/.testcontainers.properties)	true
PW_TESTCONTAINERS_CONTAINER_RUNNER	Set when the Playwright process itself runs inside a Docker container (e.g. CI), to join it to the Testcontainers network	false
SERVER_IMAGE	Prebuilt Mattermost server image testcontainers mode starts	mattermostdevelopment/mattermost-enterprise-edition:master
MM_ENV	Comma-separated KEY=VALUE server config overrides, merged over the test baseline	none
PW_LDAP_HOST / PW_LDAP_PORT	OpenLDAP host/port (only used when openldap is started)	localhost / 389
PW_KEYCLOAK_URL	Keycloak URL (only used when keycloak is started)	http://localhost:8484
PW_ELASTICSEARCH_URL	Elasticsearch URL (only used when elasticsearch is started)	http://localhost:9200
PW_OPENSEARCH_URL	OpenSearch URL (only used when opensearch is started)	http://localhost:9201
PW_MINIO_URL	Minio URL (only used when minio is started)	http://localhost:9000
PW_AZURITE_URL	Azurite URL (only used when azurite is started)	http://localhost:10000

In testcontainers mode, these host/port defaults are never actually used — Testcontainers always assigns its own dynamic port or network alias per run, so a testcontainers-mode run can never collide with a same-machine external-mode session using the fixed defaults above. Tear a reused stack down explicitly with npm run testcontainers:down (from the playwright/ package).

Accessibility Testing

The library includes built-in accessibility testing using axe-core:

import {test, expect} from '@mattermost/playwright-lib';

test('verify login page accessibility', async ({page, axe}) => {
    // # Navigate to login page
    await page.goto('/login');

    // # Run accessibility scan
    const results = await axe.builder(page).analyze();

    // * Verify no accessibility violations
    expect(results.violations).toHaveLength(0);
});

The axe-core integration:

• Runs WCAG 2.0 Level A & AA rules by default
• Provides detailed violation reports
• Supports rule customization
• Can be configured per-test or globally

Visual Testing

The library supports visual testing through Playwright's built-in visual comparisons and Percy integration:

import {test, expect} from '@mattermost/playwright-lib';

test('verify channel header appearance', async ({pw, browserName, viewport}, testInfo) => {
    // # Setup and login
    const {user} = await pw.initSetup();
    const {page, channelsPage} = await pw.testBrowser.login(user);

    // # Navigate and prepare page
    await channelsPage.goto();
    await expect(channelsPage.appBar.playbooksIcon).toBeVisible();
    await pw.hideDynamicChannelsContent(page);

    // * Take and verify snapshot
    await pw.matchSnapshot(testInfo, {page, browserName, viewport});
});

Browser Notifications

Mock and verify browser notifications:

import {test, expect} from '@mattermost/playwright-lib';

test('verify notification on mention', async ({pw}) => {
    // # Setup users and team
    const {team, adminUser, user} = await pw.initSetup();

    // # Setup admin browser with notifications
    const {page: adminPage, channelsPage: adminChannelsPage} = await pw.testBrowser.login(adminUser);
    await adminChannelsPage.goto(team.name, 'town-square');
    await pw.stubNotification(adminPage, 'granted');

    // # Setup user browser and post mention
    const {channelsPage: userChannelsPage} = await pw.testBrowser.login(user);
    await userChannelsPage.goto(team.name, 'off-topic');
    await userChannelsPage.postMessage(`@ALL good morning, ${team.name}!`);

    // * Verify notification received
    const notifications = await pw.waitForNotification(adminPage);
    expect(notifications.length).toBe(1);
});

Contributing

See CONTRIBUTING.md for development setup and guidelines.

License

See LICENSE.txt for license information.