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118 lines
3.2 KiB
Markdown
118 lines
3.2 KiB
Markdown
---
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title: "Fix Failing or Flaky Tests"
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description: "Fix Failing or Flaky Tests - Claude Code skill from the Engineering - Core domain."
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---
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# Fix Failing or Flaky Tests
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**Domain:** Engineering - Core | **Skill:** `fix` | **Source:** [`engineering-team/playwright-pro/skills/fix/SKILL.md`](https://github.com/alirezarezvani/claude-skills/tree/main/engineering-team/playwright-pro/skills/fix/SKILL.md)
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---
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# Fix Failing or Flaky Tests
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Diagnose and fix a Playwright test that fails or passes intermittently using a systematic taxonomy.
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## Input
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`$ARGUMENTS` contains:
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- A test file path: `e2e/login.spec.ts`
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- A test name: ""should redirect after login"`
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- A description: `"the checkout test fails in CI but passes locally"`
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## Steps
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### 1. Reproduce the Failure
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Run the test to capture the error:
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```bash
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npx playwright test <file> --reporter=list
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```
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If the test passes, it's likely flaky. Run burn-in:
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```bash
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npx playwright test <file> --repeat-each=10 --reporter=list
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```
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If it still passes, try with parallel workers:
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```bash
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npx playwright test --fully-parallel --workers=4 --repeat-each=5
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```
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### 2. Capture Trace
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Run with full tracing:
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```bash
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npx playwright test <file> --trace=on --retries=0
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```
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Read the trace output. Use `/debug` to analyze trace files if available.
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### 3. Categorize the Failure
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Load `flaky-taxonomy.md` from this skill directory.
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Every failing test falls into one of four categories:
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| Category | Symptom | Diagnosis |
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|---|---|---|
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| **Timing/Async** | Fails intermittently everywhere | `--repeat-each=20` reproduces locally |
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| **Test Isolation** | Fails in suite, passes alone | `--workers=1 --grep "test name"` passes |
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| **Environment** | Fails in CI, passes locally | Compare CI vs local screenshots/traces |
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| **Infrastructure** | Random, no pattern | Error references browser internals |
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### 4. Apply Targeted Fix
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**Timing/Async:**
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- Replace `waitForTimeout()` with web-first assertions
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- Add `await` to missing Playwright calls
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- Wait for specific network responses before asserting
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- Use `toBeVisible()` before interacting with elements
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**Test Isolation:**
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- Remove shared mutable state between tests
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- Create test data per-test via API or fixtures
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- Use unique identifiers (timestamps, random strings) for test data
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- Check for database state leaks
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**Environment:**
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- Match viewport sizes between local and CI
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- Account for font rendering differences in screenshots
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- Use `docker` locally to match CI environment
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- Check for timezone-dependent assertions
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**Infrastructure:**
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- Increase timeout for slow CI runners
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- Add retries in CI config (`retries: 2`)
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- Check for browser OOM (reduce parallel workers)
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- Ensure browser dependencies are installed
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### 5. Verify the Fix
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Run the test 10 times to confirm stability:
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```bash
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npx playwright test <file> --repeat-each=10 --reporter=list
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```
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All 10 must pass. If any fail, go back to step 3.
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### 6. Prevent Recurrence
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Suggest:
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- Add to CI with `retries: 2` if not already
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- Enable `trace: 'on-first-retry'` in config
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- Add the fix pattern to project's test conventions doc
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## Output
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- Root cause category and specific issue
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- The fix applied (with diff)
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- Verification result (10/10 passes)
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- Prevention recommendation
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