meet the selenium grid

MEET THE SELENIUM GRID

AS WEB DEVELOPER || QA WE WANT

Speedometer by Jamie Dickinson flow by Adam Terpenin Responsive Design by Korawan.M

FAST PARALLEL MULTIPLE BROWSERS / OS

– Alexey Nikolaenko

“Life is too short to run tests in a single thread”

servers by Jaime Carrion

Selenium Nodes

Selenium Hub

SELENIUM HUB

• Entry point for tests

• Routes your commands to proper Selenium Node

• Manages sessions

Selenium Hub

SELENIUM NODE

• Place where tests are executed

• Holds browser binaries

• Registers itself in Selenium Hub

Nerd Penguin by Hayden Kerrisk

HOW IT WORKS

• RemoteWebDriver abstraction

• JsonWireProtocol to communicate

HOW IT WORKS

Nodes register on grid

HOW IT WORKS

User by Wilson Joseph from the Noun Project

HOW IT WORKS

Capabilities {platform: “Windows”

browserName: “iexplore”}

/session

HOW IT WORKS

Session {sessionId: ‘xyz’,capabilities: {}

}

HOW IT WORKS

/session/:sessionId/{command}

HOW IT WORKS

Result {…}

HOW IT WORKS

DELETE /session/:sessionId

OTHER OPTIONS?

SAUCE LABS• Automated & Manual testing in browsers

• Supports over 500 browser / platform combinations

• On demand grid

• Reporting (video, screenshots, logs)

• No maintenance costs

• SSL Tunnel for ‘security’ (Sauce Connect)

SAUCE LABS

“***k PaaS, I want my in-house grid”

WHY IN-HOUSE?

• We are Big Enterprise

• Run tests for unlimited time

• N x 1000 concurrent users

• Without SSL tunnels

PROBLEMS WITH IN-HOUSE GRID• HUB doesn’t scale well. Single point of failure.

HOW TO SCALE HUB?

HOW TO SCALE HUB?

… …

HOW TO SCALE HUB?

… …

HOW TO SCALE HUB?

Grid router

… …

HOW TO SCALE HUB?

Grid router

… …

…

Load Balancer

SELENIUM GRID ROUTER

• Routes and proxies Selenium WedDriver requests to multiple Selenium Hubs

• Access control & Quotas

• Developed and used by Yandex

• https://github.com/seleniumkit/gridrouter

PROBLEMS WITH IN-HOUSE GRID• HUB doesn’t scale well. Single point of failure.

• Browser windows may loose focus in case of multiple executions

AVOID LOOSING FOCUS

• Multiple desktops. Each browser instance has own virtual desktop

• Linux - xvfb

• Windows - desktop-utils.exe (https://github.com/kybu/headless-selenium-for-win)

PROBLEMS WITH IN-HOUSE GRID• HUB doesn’t scale well. Single point of failure.

• Browser windows may loose focus in case of multiple executions

• Browser versions management

SELENIUM GRID EXTRAS

• Automatically upgrades WebDriver binaries

• Video recording, screenshots

• Centralised configuration

• https://github.com/groupon/Selenium-Grid-Extras

PROBLEMS WITH IN-HOUSE GRID• HUB doesn’t scale well. Single point of failure.

• Browser windows may loose focus in case of multiple executions

• Browser version management

• Complex UI component tests

COMPLEX UI COMPONENTS?

• Canvas (noVNC, Charts)

• Rich JS components

COMPLEX UI COMPONENTS?

• Canvas (noVNC, Charts)

• Rich JS components

SELENIUM GRID EXTENSIONSby sterodium.io

SELENIUM GRID EXTENSIONS

DOWNLOAD / UPLOAD resource capabilities

SELENIUM GRID EXTENSIONS

Extension Proxy

Node Extensions- Sikuli Extension- Files Extension

SELENIUM GRID EXTENSIONS• Sikuli requires own virtual desktop.

• Allocate virtual desktop to each Selenium node

• Limit session count to 1 per node

• Launch multiple nodes on different ports

• Images uploaded to Selenium Node.

• Same Sikuli API. Just proxied.

• http://sterodium.io/

• https://github.com/sterodium/selenium-grid-extensions

• Examples: https://github.com/echoAlexey/selenium-examples

Q/A

ABOUT ME

• Software Engineer @ Neueda Technologies

• Working on a set of tools for Test Automation.

• @echoAlexey

• alexey@tcherezov.com