Architecture Decision Record
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Architectur decisioun record: browser automatioun framewark for E2E testin (Playwright vs Selenium)

1. Context

We are in the process o selectin a browser automatioun framewark for oor end-tae-end (E2E) testin pipeline. This framewark will be integral tae oor CI/CD processes, rinnin tests that simulate real uiser interactiouns on oor platform. Specifically, the tests will cover scenarios sic as uiser sign-up/sign-in, file uploads, dashboard interactiouns, an report doonloads.

As a startup, oor focus is on agile develapment, wi a need tae rapidly iterate an evolve. Oor team predominantly warks wi TypeScript an Python, an the ability tae screive tests in thir leids is essential. Additionally, the platform contains interactive chairts an dashboards, which maks it critical that the automatioun tuil supports rich, dynamic UIs weel.

The twa contenders for this task are Playwright an Selenium, each wi its strengths an trade-offs. We need tae evaluate thir frameworks based on the features an requirements outlined ablow.

2. Considered Options

  • Playwright (by Microsoft)
  • Selenium (by the Selenium Project)

3. Decision Drivers

The factors influencin oor decisioun are as follaes:

  1. Agile Development: The chosen tuil maun enable fast, flexible develapment cycles.
  2. Language Support: Oor team requires support for baith TypeScript an Python.
  3. Interactive UI Testing: The ability tae test interactive chairts, dashboards, an dynamic elements reliably is essential.
  4. Runtime Speed: While no a primary concern, performance in CI/CD pipelines is a consideration.
  5. Scalability: We are no plannin for muckle scalin in the immediate future, but we want tae ensure the solution can haunle future growth.
  6. Backwards Compatibility: Legacy systems an compatibility wi aulder browsers arena critical for oor project at this time.
  7. Mobile Testing: While no an immediate focus, the framewark sud be capable o testin mobile-responsive features or be extensible for sic uise cases.
  8. Multi-monitor Testing: Support for multi-monitor configuratiouns is a secondary requirement, especially if we ever scale tae testin for mair complex uiser workflows.
  9. File Upload Testing: The framewark maun haunle file uploads efficiently, a core requirement o oor testin needs.

4. Evaluation Criteria

  • Ease of Use: Hoo easy is it tae screive an keep up tests?
  • Language Support: Daes the framewark support TypeScript an Python, the twa leids oor team uises maist frequently?
  • Interactive UI Testing: Hoo weel daes the framewark haunle complex, interactive uiser interfaces sic as chairts, file uploads, an dynamic data?
  • CI/CD Integration: Hoo weel daes the framewark integrate intae common CI/CD tuils an services?
  • Cross-browser Support: Whit browsers are supportit an hoo weel dae they perform?
  • Performance and Speed: Hoo quickly dae tests rin, especially in a CI/CD pipeline?
  • Scalability: Hoo weel can the framewark scale if mair tests or mair complex scenarios are addit?
  • Community and Ecosystem: Hoo active is the framewark's community? Are there plenty o integratiouns an extensiouns available?

5. Considerations

5.1 Playwright

Pros:
  1. Smarter API for Local File Uploads: Playwright’s API for interactin wi local files an performin file uploads is simpler an mair intuitive. This wud mak file upload testin easier tae implement an keep up.
  2. Syntax and Code Generation: Playwright haes a shorter, mair concise syntax. This results in less boilerplate code, which improves maintainability an developer efficiency. Additionally, this shorter syntax improves OpenAI code generation quality, makin it easier tae automatically generate test scripts.
  3. Interactive UI Testing: Playwright excels at testin dynamic, interactive wab applications, sic as thae wi rich chairts, complex uiser interactiouns, an real-time updates. It haunles WebSockets, WebRTC, shadow DOMs, an ither modern wab technologies unco effectively.
  4. Cross-browser Support: Playwright supports Chromium, WebKit, an Firefox. It haes consistent performance athort thir browsers, which sud cover maist o oor testin needs.
  5. CI/CD Integration: Playwright integrates seamlessly wi modern CI/CD platforms (GitHub Actions, Jenkins, etc.). It can rin tests in parallel athort different browsers, optimisin test rin times an makin it suitable for rapid develapment.
  6. Fast and Reliable: Playwright is faster than Selenium in general, especially in headless mode, an mair resilient whan dealin wi asynchronous wab elements.
Cons:
  1. Limited Mobile Testing: While Playwright daes support mobile emulation for browsers, it lacks native mobile testin capabilities like Selenium’s integratioun wi Appium for true mobile testin.
  2. Smaller Ecosystem: Playwright is still newer an less establisht than Selenium. While it haes a rapidly growin community an guid documentation, it micht no yet hae the vast ecosystem o plugins an integratiouns that Selenium offers.
  3. Limited Browser Support: While Playwright covers the major modern browsers (Chrome, Safari, Firefox), its support for legacy browsers (e.g., Internet Explorer) isna as robust as Selenium’s.

5.2 Selenium

Pros:
  1. Longer History and Maturity: Selenium haes been roun for a lang time an haes a pruved track record. It’s widely uised athort mony teams an industries, which haes led tae a vast ecosystem o plugins, integratiouns, an resources.
  2. Cross-browser and Cross-platform Support: Selenium supports a wide variety of browsers an versiouns, includin Internet Explorer, an can an aw be integratit wi various tuils like Docker, Selenium Grid, an cloud services for distributit testin.
  3. Mobile Testing: Selenium, throu its integratioun wi Appium, is muckle mair robust for mobile testin, includin baith Android an iOS applications. This maks it the better chyce for projects wi a mobile-first or mobile-heavy focus.
  4. Multi-monitor Testing: Selenium provides better support for scenarios involvin multiple monitors or complex multi-window interactiouns.
Cons:
  1. Complexity: Selenium’s API is mair verbose an explicit. While this can be an advantage in some cases, it means mair code tae screive an keep up, which micht reduce developer agility—especially important in a startup environment.
  2. Performance: Selenium generally rins slawer than Playwright, especially in headless mode. This could impact CI/CD pipelines, particularly as the nummer o tests growes.
  3. Interactive UI Testing: Selenium isna as smooth as Playwright whan it comes tae testin modern, interactive wab UIs, particularly wi chairts an real-time data updates. It requires mair setup an haunlin tae reliably interact wi dynamic content.

6. Comparison Summary

Feature Playwright Selenium
Ease of Use Shorter syntax, mair intuitive for modern UIs Mair explicit, requires mair boilerplate
Language Support TypeScript, Python, JavaScript TypeScript, Python, Java, Ruby, C#
Interactive UI Testing Excellent for dynamic, real-time UIs Haunles basic UIs, but mair verbose an complex for rich interactiouns
File Upload Testing Smarter API for file uploads Mair verbose, less intuitive API
CI/CD Integration Easy integratioun wi GitHub Actions, Jenkins Strang integratioun wi mony CI tuils
Mobile Testing Limitit, juist emulation Full support throu Appium
Cross-browser Support Chromium, WebKit, Firefox Full support athort major an legacy browsers
Performance Fast, optimised for headless testin Slawer, especially in headless mode
Multi-monitor Testing Limitit Guid support for multi-monitor setups
Community and Ecosystem Growin, guid documentation Lairge, mature, extensive ecosystem

7. Decision

Efter considerin the requirements an trade-offs, Playwright is the better chyce for oor current needs. Its smarter API for local file upload testin, concise syntax, an strang support for interactive UI testin mak it an ideal fit for oor agile develapment cycle. The fact that it supports baith TypeScript an Python is critical for oor team, an the framewark's modern approach tae testin will let us screive clean, maintainable code.

While Selenium bides a great tuil, particularly for mobile testin, legacy browser support, an multi-monitor setups, it is less weel-suitit tae oor current needs. Its verbosity, slawer performance, an mair complex haunlin o dynamic UIs like chairts mak it less optimal for oor uise case.

8. Consequences

  • Immediate Action: We will adopt Playwright for oor E2E testin, focusin on testin uiser flows involvin sign-up, sign-in, file uploads, dashboards, an report doonloads.
  • Long-Term Considerations: We will keep an ee on the evolvin Playwright ecosystem. If oor needs chynge, particularly aroun mobile testin or support for legacy browsers, we micht revisit Selenium.
  • Training and Documentation: Develapment teams will need tae become familiar wi Playwright's API, particularly for haunlin dynamic UIs an file uploads.
  • Migration: Existin Selenium tests (if onie) will be gradually migratit tae Playwright.

9. Future Considerations