The document discusses the Selenium Grid, emphasizing its architecture for parallel testing across multiple browsers and operating systems. It addresses challenges with in-house grids, such as scalability and resource management, and introduces solutions like the Selenium Grid Router and Grid Extras. The text also covers extensions for enhanced capabilities and the need for proper configurations to manage complex UI component testing.

1. MEETTHE
SELENIUM GRID

2. AS WEB DEVELOPER || QA
WE WANT
Speedometer by Jamie Dickinson
flow by AdamTerpenin
Responsive Design by Korawan.M
FAST PARALLEL MULTIPLE
BROWSERS / OS

3. – Alexey Nikolaenko
“Life is too short to run tests in a single thread”

4. servers by Jaime Carrion
Selenium Nodes
Selenium Hub

5. SELENIUM HUB
• Entry point for tests
• Routes your commands to
proper Selenium Node
• Manages sessions
Selenium Hub

6. SELENIUM NODE
• Place where tests are executed
• Holds browser binaries
• Registers itself in Selenium Hub
Nerd Penguin by Hayden Kerrisk

8. HOW IT WORKS
• RemoteWebDriver abstraction
• JsonWireProtocol to communicate

9. HOW IT WORKS
Nodes register on grid

10. HOW IT WORKS
User by Wilson Joseph from the Noun Project

11. HOW IT WORKS
Capabilities {
platform:“Windows”
browserName:“iexplore”
}
/session

12. HOW IT WORKS
Session {
sessionId:‘xyz’,
capabilities: {}
}

13. HOW IT WORKS
/session/:sessionId/{command}

14. HOW IT WORKS
Result {…}

15. HOW IT WORKS
DELETE /session/:sessionId

16. OTHER OPTIONS?

17. SAUCE LABS
• Automated & Manual testing in browsers
• Supports over 500 browser / platform combinations
• On demand grid
• Reporting (video, screenshots, logs)
• No maintenance costs
• SSLTunnel for ‘security’ (Sauce Connect)

18. SAUCE LABS

19. “***k PaaS, I want my in-house grid”

20. WHY IN-HOUSE?
• We are Big Enterprise
• Run tests for unlimited time
• N x 1000 concurrent users
• Without SSL tunnels

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

22. HOWTO SCALE HUB?

23. HOWTO SCALE HUB?
… …

24. HOWTO SCALE HUB?
… …

25. HOWTO SCALE HUB?
Grid router
… …

26. HOWTO SCALE HUB?
Grid router
… …
…
Load Balancer

27. SELENIUM GRID ROUTER
• Routes and proxies Selenium WedDriver requests to multiple
Selenium Hubs
• Access control & Quotas
• Developed and used byYandex
• https://github.com/seleniumkit/gridrouter

28. PROBLEMS WITH IN-HOUSE GRID
• HUB doesn’t scale well. Single point of failure.
• Browser windows may loose focus in case of multiple
executions

29. 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)

30. 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

31. SELENIUM GRID EXTRAS
• Automatically upgrades WebDriver binaries
• Video recording, screenshots
• Centralised configuration
• https://github.com/groupon/Selenium-Grid-Extras

32. 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

33. COMPLEX UI COMPONENTS?
• Canvas (noVNC, Charts)
• Rich JS components

34. COMPLEX UI COMPONENTS?
• Canvas (noVNC, Charts)
• Rich JS components

35. SELENIUM GRID EXTENSIONS
by sterodium.io

36. SELENIUM GRID EXTENSIONS
DOWNLOAD / UPLOAD resource capabilities

37. SELENIUM GRID EXTENSIONS
Extension
Proxy
Node Extensions
- Sikuli Extension
- Files Extension

38. 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.

39. • http://sterodium.io/
• https://github.com/sterodium/selenium-grid-extensions
• Examples: https://github.com/echoAlexey/selenium-examples

44. Q/A

45. ABOUT ME
• Software Engineer @ NeuedaTechnologies
• Working on a set of tools forTest Automation.
• @echoAlexey
• alexey@tcherezov.com