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webapp-testing

Skill130 starsChanged 10 months agoMITView on GitHub

Web application testing principles. E2E, Playwright, deep audit strategies.

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1 rule. 0 are common, 1 is distinctive, and 0 are very specific to this project.

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  • Common
  • Distinctive
  • Very specific
  1. Distinctive:

    Scan: - Verify they respond

    line 39

“Common” is measured: kept by at least 6 in 10 of the 189 edited versions of this file we could read. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

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SKILL.md

Web App Testing

Discover and test everything. Leave no route untested.

🔧 Runtime Scripts

Execute these for automated browser testing:

ScriptPurposeUsage
scripts/playwright_runner.pyBasic browser testpython scripts/playwright_runner.py https://example.com
With screenshotpython scripts/playwright_runner.py <url> --screenshot
Accessibility checkpython scripts/playwright_runner.py <url> --a11y

Requires: pip install playwright && playwright install chromium

1. Deep Audit Approach

Discovery First

TargetHow to Find
RoutesScan app/, pages/, router files
API endpointsGrep for HTTP methods
ComponentsFind component directories
FeaturesRead documentation

Systematic Testing

  1. Map - List all routes/APIs
  2. Scan - Verify they respond
  3. Test - Cover critical paths

2. Testing Pyramid for Web

        /\          E2E (Few)
       /  \         Critical user flows
      /----\
     /      \       Integration (Some)
    /--------\      API, data flow
   /          \
  /------------\    Component (Many)
                    Individual UI pieces

3. E2E Test Principles

What to Test

PriorityTests
1Happy path user flows
2Authentication flows
3Critical business actions
4Error handling

E2E Best Practices

PracticeWhy
Use data-testidStable selectors
Wait for elementsAvoid flaky tests
Clean stateIndependent tests
Avoid implementation detailsTest user behavior

4. Playwright Principles

Core Concepts

ConceptUse
Page Object ModelEncapsulate page logic
FixturesReusable test setup
AssertionsBuilt-in auto-wait
Trace ViewerDebug failures

Configuration

SettingRecommendation
Retries2 on CI
Traceon-first-retry
Screenshotson-failure
Videoretain-on-failure

5. Visual Testing

When to Use

ScenarioValue
Design systemHigh
Marketing pagesHigh
Component libraryMedium
Dynamic contentLower

Strategy

  • Baseline screenshots
  • Compare on changes
  • Review visual diffs
  • Update intentional changes

6. API Testing Principles

Coverage Areas

AreaTests
Status codes200, 400, 404, 500
Response shapeMatches schema
Error messagesUser-friendly
Edge casesEmpty, large, special chars

7. Test Organization

File Structure

tests/
├── e2e/           # Full user flows
├── integration/   # API, data
├── component/     # UI units
└── fixtures/      # Shared data

Naming Convention

PatternExample
Feature-basedlogin.spec.ts
Descriptiveuser-can-checkout.spec.ts

8. CI Integration

Pipeline Steps

  1. Install dependencies
  2. Install browsers
  3. Run tests
  4. Upload artifacts (traces, screenshots)

Parallelization

StrategyUse
Per filePlaywright default
ShardingLarge suites
WorkersMultiple browsers

9. Anti-Patterns

❌ Don't✅ Do
Test implementationTest behavior
Hardcode waitsUse auto-wait
Skip cleanupIsolate tests
Ignore flaky testsFix root cause

Remember: E2E tests are expensive. Use them for critical paths only.

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