# Phase 4 UAT - E2E Critical Blocker Resolution Guide

**Status:** 🔴 CRITICAL BLOCKER
**Date:** February 10, 2026
**Next Action:** FIX FRONTEND RENDERING

---

## Summary

All 111 Phase 4 E2E tests failed because **the React frontend is not rendering the main UI element** within the 5-second timeout.

```
TimeoutError: page.waitForSelector: Timeout 5000ms exceeded.
Call log:
  - waiting for locator('[role="main"]') to be visible
```

**35 tests failed immediately** when trying to find `[role="main"]` in the DOM.
**74 tests never ran** due to the issue.
**Release is blocked** until this is fixed.

---

## Root Cause

The React application is not initializing properly:

✅ **Working:**
- Docker container is healthy
- Backend API is responding (`/api/v1/health`)
- HTML page loads (includes script/CSS references)
- Port 8080 is accessible

❌ **Broken:**
- JavaScript bundle not executing
- React root element (`#root`) not being used
- `[role="main"]` component never created
- Application initialization fails/times out

---

## Quick Fixes to Try (in order)

### Option 1: Clean Rebuild (Most Likely to Work)
```bash
# Navigate to project
cd /projects/Charon

# Clean rebuild of E2E environment
.github/skills/scripts/skill-runner.sh docker-rebuild-e2e

# Run a single test to verify
npx playwright test tests/auth.setup.ts --project=firefox
```

### Option 2: Check Frontend Build
```bash
# Verify frontend was built during Docker build
docker exec charon-e2e ls -lah /app/dist/

# Check if dist directory has content
docker exec charon-e2e find /app/dist -type f | head -20
```

### Option 3: Debug with Browser Console
```bash
# Run test in debug mode to see errors
npx playwright test tests/phase4-integration/01-admin-user-e2e-workflow.spec.ts --project=firefox --debug

# Open browser inspector to check console errors
```

### Option 4: Check Environment Variables
```bash
# Verify frontend environment in container
docker exec charon-e2e env | grep -i "VITE\|REACT\|API"

# Check if API endpoint is configured correctly
docker exec charon-e2e cat /app/dist/index.html | grep "src="
```

---

## Testing After Fix

### Step 1: Rebuild
```bash
.github/skills/scripts/skill-runner.sh docker-rebuild-e2e
```

### Step 2: Verify Container is Healthy
```bash
# Check container status
docker ps | grep charon-e2e

# Test health endpoint
curl -s http://localhost:8080/api/v1/health
```

### Step 3: Run Single Test
```bash
# Quick test to verify frontend is now rendering
npx playwright test tests/auth.setup.ts --project=firefox
```

### Step 4: Run Full Suite
```bash
# If single test passes, run full Phase 4 suite
npx playwright test tests/phase4-uat/ tests/phase4-integration/ --project=firefox

# Expected result: 111 tests passing
```

---

## What Happens After Fix

Once frontend rendering is fixed and E2E tests pass:

1. ✅ Verify E2E tests: **111/111 passing**
2. ✅ Run Backend Coverage (≥85% required)
3. ✅ Run Frontend Coverage (≥87% required)
4. ✅ Type Check: `npm run type-check`
5. ✅ Pre-commit Hooks: `pre-commit run --all-files`
6. ✅ Security Scans: Trivy + Docker Image + CodeQL
7. ✅ Linting: Go + Frontend + Markdown
8. ✅ Generate Final QA Report
9. ✅ Release Ready

---

## Key Files

| File | Purpose |
|------|---------|
| `docs/reports/qa_report.md` | Full QA verification report |
| `Dockerfile` | Frontend build configuration |
| `frontend/*/` | React source code |
| `tests/phase4-*/` | E2E test files |
| `.docker/compose/docker-compose.playwright-local.yml` | E2E environment config |

---

## Prevention for Future

- Add frontend health check to E2E setup
- Add console error detection to test framework
- Add JavaScript bundle verification step
- Monitor React initialization timing

---

## Support

For additional options, see: [QA Report](docs/reports/qa_report.md)