chore: add playwright cursor skill

2026-05-13 17:52:38 +02:00 · 2026-05-10 04:19:55 +05:30 · 2026-05-10 04:19:55 +05:30 · d52225c18d
commit d52225c18d
parent 25aad38ca4
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+# Container-Based Testing
+
+## Table of Contents
+
+1. [Patterns](#patterns)
+2. [Decision Guide](#decision-guide)
+3. [Anti-Patterns](#anti-patterns)
+4. [Troubleshooting](#troubleshooting)
+
+> **When to use**: Running tests in containers for reproducible environments, CI pipelines, or consistent browser versions across team machines.
+
+## Patterns
+
+### Official Image Usage
+
+Run tests without building a custom image:
+
+```bash
+docker run --rm \
+  -v $(pwd):/app \
+  -w /app \
+  -e CI=true \
+  -e BASE_URL=http://host.docker.internal:3000 \
+  mcr.microsoft.com/playwright:v1.48.0-noble \
+  bash -c "npm ci && npx playwright test"
+```
+
+Extract reports with bind mounts:
+
+```bash
+docker run --rm \
+  -v $(pwd):/app \
+  -v $(pwd)/playwright-report:/app/playwright-report \
+  -v $(pwd)/test-results:/app/test-results \
+  -w /app \
+  mcr.microsoft.com/playwright:v1.48.0-noble \
+  bash -c "npm ci && npx playwright test"
+```
+
+### Custom Dockerfile
+
+Build a custom image when you need additional dependencies or pre-installed packages:
+
+```dockerfile
+FROM mcr.microsoft.com/playwright:v1.48.0-noble
+
+WORKDIR /app
+
+COPY package.json package-lock.json ./
+RUN npm ci
+
+COPY . .
+
+CMD ["npx", "playwright", "test"]
+```
+
+Chromium-only slim image:
+
+```dockerfile
+FROM node:latest-slim
+
+RUN npx playwright install --with-deps chromium
+
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci
+COPY . .
+
+CMD ["npx", "playwright", "test", "--project=chromium"]
+```
+
+### Docker Compose Stack
+
+Full application stack with database, cache, and test runner:
+
+```yaml
+services:
+  app:
+    build: .
+    ports:
+      - "3000:3000"
+    environment:
+      - NODE_ENV=test
+      - DATABASE_URL=postgresql://postgres:postgres@db:5432/test
+    depends_on:
+      db:
+        condition: service_healthy
+
+  db:
+    image: postgres:latest-alpine
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_DB: test
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+    tmpfs:
+      - /var/lib/postgresql/data
+
+  e2e:
+    image: mcr.microsoft.com/playwright:v1.48.0-noble
+    working_dir: /app
+    volumes:
+      - .:/app
+      - /app/node_modules
+    environment:
+      - CI=true
+      - BASE_URL=http://app:3000
+    depends_on:
+      - app
+    command: bash -c "npm ci && npx playwright test"
+    profiles:
+      - test
+```
+
+Run commands:
+
+```bash
+docker compose --profile test up --abort-on-container-exit --exit-code-from e2e
+
+docker compose --profile test down -v
+```
+
+### CI Container Jobs
+
+**GitHub Actions:**
+
+```yaml
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    container:
+      image: mcr.microsoft.com/playwright:v1.48.0-noble
+    steps:
+      - uses: actions/checkout@v4
+      - run: npm ci
+      - run: npx playwright test
+        env:
+          HOME: /root
+```
+
+**GitLab CI:**
+
+```yaml
+test:
+  image: mcr.microsoft.com/playwright:v1.48.0-noble
+  script:
+    - npm ci
+    - npx playwright test
+```
+
+**Jenkins:**
+
+```groovy
+pipeline {
+    agent {
+        docker {
+            image 'mcr.microsoft.com/playwright:v1.48.0-noble'
+            args '-u root'
+        }
+    }
+    stages {
+        stage('Test') {
+            steps {
+                sh 'npm ci'
+                sh 'npx playwright test'
+            }
+        }
+    }
+}
+```
+
+### Dev Container Setup
+
+VS Code Dev Container or GitHub Codespaces configuration:
+
+```json
+{
+  "name": "Playwright Dev",
+  "image": "mcr.microsoft.com/playwright:v1.48.0-noble",
+  "features": {
+    "ghcr.io/devcontainers/features/node:latest": {
+      "version": "20"
+    }
+  },
+  "postCreateCommand": "npm ci",
+  "customizations": {
+    "vscode": {
+      "extensions": ["ms-playwright.playwright"]
+    }
+  },
+  "forwardPorts": [3000, 9323],
+  "remoteUser": "root"
+}
+```
+
+## Decision Guide
+
+| Scenario | Approach |
+|---|---|
+| Simple CI pipeline | Official image as CI container |
+| Tests need database + cache | Docker Compose with app, db, e2e services |
+| Team needs identical environments | Dev Container or custom Dockerfile |
+| Only testing Chromium | Slim image with `install --with-deps chromium` |
+| Cross-browser testing | Official image (all browsers pre-installed) |
+| Local development | Run directly on host for faster iteration |
+
+## Anti-Patterns
+
+| Anti-Pattern | Problem | Solution |
+|---|---|---|
+| Installing browsers at runtime | Wastes 60-90 seconds per run | Use official image or bake browsers into custom image |
+| Running as non-root without sandbox config | Chromium sandbox permission errors | Run as root or disable sandbox |
+| Bind-mounting `node_modules` from host | Platform-specific binary crashes | Use anonymous volume: `-v /app/node_modules` |
+| No health checks on dependent services | Tests start before database ready | Add `healthcheck` with `depends_on: condition: service_healthy` |
+| Building application inside Playwright container | Large image, slow builds | Separate app and e2e containers |
+
+## Troubleshooting
+
+### "browserType.launch: Executable doesn't exist"
+
+Playwright version mismatch with Docker image. Ensure `@playwright/test` version matches image tag:
+
+```bash
+npm ls @playwright/test
+docker pull mcr.microsoft.com/playwright:v<matching-version>-noble
+```
+
+### "net::ERR_CONNECTION_REFUSED" in docker-compose
+
+Tests trying to reach `localhost` instead of service name. Configure `baseURL`:
+
+```typescript
+import { defineConfig } from '@playwright/test';
+
+export default defineConfig({
+  use: {
+    baseURL: process.env.BASE_URL || 'http://localhost:3000',
+  },
+});
+```
+
+```yaml
+e2e:
+  environment:
+    - BASE_URL=http://app:3000
+```
+
+### Permission denied on mounted volumes
+
+Match user IDs or run as root:
+
+```bash
+docker run --rm -u $(id -u):$(id -g) \
+  -v $(pwd):/app -w /app \
+  mcr.microsoft.com/playwright:v1.48.0-noble \
+  npx playwright test
+```
+
+### Slow container tests on macOS/Windows
+
+Docker Desktop I/O overhead. Copy files instead of mounting:
+
+```dockerfile
+FROM mcr.microsoft.com/playwright:v1.48.0-noble
+WORKDIR /app
+COPY . .
+RUN npm ci
+CMD ["npx", "playwright", "test"]
+```
+
+Or use delegated mount:
+
+```bash
+docker run --rm \
+  -v $(pwd):/app:delegated \
+  -w /app \
+  mcr.microsoft.com/playwright:v1.48.0-noble \
+  bash -c "npm ci && npx playwright test"
+```