[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"skill-54e3ab68-dc54-4174-87a1-2ce7ccaa8ca2":3,"$frv5HFUzu0a-VlnVl655X3Xtqpipb8h1BwmiEQNdGDRY":43},{"id":4,"title":5,"description":6,"categoryId":7,"moduleId":8,"tags":9,"prompt":10,"icon":11,"source":12,"sourceUrl":13,"authorId":14,"authorName":15,"isPublic":16,"stars":17,"runs":18,"createdAt":19,"updatedAt":19,"module":20,"category":27,"packages":34},"54e3ab68-dc54-4174-87a1-2ce7ccaa8ca2","k6-load-testing","全面的k6负载测试技能，适用于API、浏览器和可扩展性测试。编写真实的负载场景，分析结果，并与CI\u002FCD集成。","cat_coding_review","mod_coding","sickn33,coding","---\nname: k6-load-testing\ndescription: \"Comprehensive k6 load testing skill for API, browser, and scalability testing. Write realistic load scenarios, analyze results, and integrate with CI\u002FCD.\"\ncategory: testing\nrisk: safe\nsource: community\ndate_added: \"2026-03-13\"\nauthor: Kairo Official\ntags: [k6, load-testing, performance, api-testing, ci-cd]\ntools: [claude, cursor, gemini]\n---\n\n# k6 Load Testing\n\n## Overview\n\nk6 is a modern, developer-centric load testing tool that helps you write and execute performance tests for HTTP APIs, WebSocket endpoints, and browser scenarios. This skill provides comprehensive guidance on writing realistic load tests, configuring test scenarios (smoke, load, stress, spike, soak), analyzing results, and integrating with CI\u002FCD pipelines.\n\nUse this skill when you need to validate system performance, identify bottlenecks, ensure SLA compliance, or catch performance regressions before deployment.\n\n---\n\n## When to Use This Skill\n\n- Use when you need to load test HTTP APIs, WebSocket endpoints, or browser scenarios\n- Use when setting up performance regression tests in CI\u002FCD\n- Use when analyzing system behavior under various load conditions\n- Use when comparing performance between code changes\n- Use when validating SLA requirements and performance budgets\n\n---\n\n## k6 Basics\n\n### Installation\n\n```bash\n# macOS\nbrew install k6\n\n# Windows\nchoco install k6\n\n# Linux\nsudo gpg -k\nsudo gpg --no-default-keyring --keyring \u002Fusr\u002Fshare\u002Fkeyrings\u002Fk6-archive-keyring.gpg --keyserver hkp:\u002F\u002Fkeyserver.ubuntu.com:80 --recv-keys C5AD17C747E3415A3642D57D77C6C491D6AC1D69\necho \"deb [signed-by=\u002Fusr\u002Fshare\u002Fkeyrings\u002Fk6-archive-keyring.gpg] https:\u002F\u002Fdl.k6.io\u002Fdeb stable main\" | sudo tee \u002Fetc\u002Fapt\u002Fsources.list.d\u002Fk6.list\nsudo apt-get update\nsudo apt-get install k6\n```\n\n### Quick Start\n\n```javascript\n\u002F\u002F simple-test.js\nimport http from 'k6\u002Fhttp';\nimport { check, sleep } from 'k6';\n\nexport const options = {\n  vus: 10,\n  duration: '30s',\n};\n\nexport default function () {\n  const res = http.get('https:\u002F\u002Fhttpbin.test.k6.io\u002Fget');\n  \n  check(res, {\n    'status is 200': (r) => r.status === 200,\n    'response time \u003C 500ms': (r) => r.timings.duration \u003C 500,\n  });\n  \n  sleep(1);\n}\n```\n\nRun with: `k6 run simple-test.js`\n\n---\n\n## Test Configuration\n\n### Common Options\n\n```javascript\nexport const options = {\n  \u002F\u002F Virtual Users (concurrent users)\n  vus: 100,\n  \n  \u002F\u002F Test duration\n  duration: '5m',\n  \n  \u002F\u002F Or use stages for ramp-up\u002Framp-down\n  stages: [\n    { duration: '30s', target: 20 },   \u002F\u002F Ramp up\n    { duration: '1m', target: 100 },  \u002F\u002F Stay at 100\n    { duration: '30s', target: 0 },    \u002F\u002F Ramp down\n  ],\n  \n  \u002F\u002F Thresholds (SLA)\n  thresholds: {\n    http_req_duration: ['p(95)\u003C500'],  \u002F\u002F 95% requests \u003C 500ms\n    http_req_failed: ['rate\u003C0.01'],     \u002F\u002F Error rate \u003C 1%\n  },\n  \n  \u002F\u002F Load zones (distributed testing)\n  ext: {\n    loadimpact: {\n      name: 'My Load Test',\n      distribution: {\n        'amazon:us:ashburn': { weight: 50 },\n        'amazon:eu: Dublin': { weight: 50 },\n      },\n    },\n  },\n};\n```\n\n### Test Types\n\n| Type | Use Case | Configuration |\n|------|----------|---------------|\n| Smoke Test | Verify basic functionality | Low VUs (1-5), short duration |\n| Load Test | Normal expected load | Target VUs based on traffic |\n| Stress Test | Find breaking point | Ramp beyond capacity |\n| Spike Test | Sudden traffic spikes | Rapid increase\u002Fdecrease |\n| Soak Test | Long-term stability | Extended duration |\n\n---\n\n## HTTP Testing\n\n### Basic Requests\n\n```javascript\nimport http from 'k6\u002Fhttp';\nimport { check, sleep } from 'k6';\n\nexport default function () {\n  \u002F\u002F GET request\n  const getRes = http.get('https:\u002F\u002Fapi.example.com\u002Fusers');\n  \n  check(getRes, {\n    'GET succeeded': (r) => r.status === 200,\n    'has users': (r) => r.json('data.length') > 0,\n  });\n\n  \u002F\u002F POST request with JSON body\n  const postRes = http.post('https:\u002F\u002Fapi.example.com\u002Fusers', \n    JSON.stringify({ name: 'Test User', email: 'test@example.com' }),\n    {\n      headers: {\n        'Content-Type': 'application\u002Fjson',\n        'Authorization': 'Bearer ' + __ENV.API_TOKEN,\n      },\n    }\n  );\n  \n  check(postRes, {\n    'POST succeeded': (r) => r.status === 201,\n    'user created': (r) => r.json('id') !== undefined,\n  });\n\n  sleep(1);\n}\n```\n\n### Request Chaining\n\n```javascript\nimport http from 'k6\u002Fhttp';\nimport { check } from 'k6';\n\nexport default function () {\n  \u002F\u002F Login and extract token\n  const loginRes = http.post('https:\u002F\u002Fapi.example.com\u002Flogin', \n    JSON.stringify({ email: 'test@example.com', password: 'password123' })\n  );\n  \n  const token = loginRes.json('access_token');\n  \n  \u002F\u002F Use token in subsequent requests\n  const headers = {\n    'Authorization': `Bearer ${token}`,\n    'Content-Type': 'application\u002Fjson',\n  };\n  \n  const profileRes = http.get('https:\u002F\u002Fapi.example.com\u002Fprofile', {\n    headers: headers,\n  });\n  \n  check(profileRes, {\n    'profile loaded': (r) => r.status === 200,\n  });\n}\n```\n\n### Parameterized Testing\n\n```javascript\nimport http from 'k6\u002Fhttp';\nimport { check } from 'k6';\n\nconst usernames = ['user1', 'user2', 'user3', 'user4', 'user5'];\n\nexport default function () {\n  \u002F\u002F Use shared array with VU-specific index\n  const username = usernames[__VU % usernames.length];\n  \n  const res = http.get(`https:\u002F\u002Fapi.example.com\u002Fusers\u002F${username}`);\n  \n  check(res, {\n    'user found': (r) => r.status === 200,\n  });\n}\n```\n\n---\n\n## Browser Testing (k6 Browser)\n\n```javascript\nimport { browser } from 'k6\u002Fbrowser';\n\nexport const options = {\n  scenarios: {\n    browser_test: {\n      executor: 'constant-vus',\n      vus: 5,\n      duration: '30s',\n      browser: {\n        type: 'chromium',\n      },\n    },\n  },\n};\n\nexport default async function () {\n  const page = await browser.newPage();\n  \n  try {\n    await page.goto('https:\u002F\u002Fexample.com');\n    \n    const title = await page.title();\n    console.log(`Page title: ${title}`);\n    \n    \u002F\u002F Click and interact\n    await page.click('button[data-testid=\"submit\"]');\n    \n    \u002F\u002F Wait for response\n    await page.waitForSelector('.success-message');\n    \n  } finally {\n    await page.close();\n  }\n}\n```\n\nInstall browser support: `k6 install chromium`\n\n---\n\n## WebSocket Testing\n\n```javascript\nimport ws from 'k6\u002Fws';\nimport { check } from 'k6';\n\nexport default function () {\n  const url = 'wss:\u002F\u002Fecho.websocket.org';\n  \n  ws.connect(url, {}, function (socket) {\n    socket.on('open', () => {\n      console.log('WebSocket connected');\n      socket.send('Hello WebSocket');\n    });\n    \n    socket.on('message', (data) => {\n      console.log(`Received: ${data}`);\n      check(data, {\n        'echo received': (d) => d.includes('Hello'),\n      });\n    });\n    \n    socket.on('close', () => {\n      console.log('WebSocket closed');\n    });\n    \n    \u002F\u002F Send periodic messages\n    socket.setInterval(function () {\n      socket.send('ping');\n    }, 1000);\n    \n    \u002F\u002F Close after 5 seconds\n    socket.setTimeout(function () {\n      socket.close();\n    }, 5000);\n  });\n}\n```\n\n---\n\n## Data Handling\n\n### CSV Data Source\n\n```javascript\nimport http from 'k6\u002Fhttp';\nimport { check } from 'k6';\nimport { SharedArray } from 'k6\u002Fdata';\n\n\u002F\u002F Option 1: Load once, shared across VUs\nconst users = new SharedArray('users', function () {\n  return open('.\u002Fusers.csv').split('\\n').slice(1).map(line => {\n    const [email, password] = line.split(',');\n    return { email, password };\n  });\n});\n\nexport default function () {\n  const user = users[__VU % users.length];\n  \n  const res = http.post('https:\u002F\u002Fapi.example.com\u002Flogin',\n    JSON.stringify({ email: user.email, password: user.password })\n  );\n  \n  check(res, { 'login successful': (r) => r.status === 200 });\n}\n```\n\n### JSON Data Source\n\n```javascript\nimport http from 'k6\u002Fhttp';\nimport { check } from 'k6';\nimport { SharedArray } from 'k6\u002Fdata';\n\nconst products = new SharedArray('products', function () {\n  return JSON.parse(open('.\u002Fproducts.json'));\n});\n\nexport default function () {\n  const product = products[Math.floor(Math.random() * products.length)];\n  \n  const res = http.get(`https:\u002F\u002Fapi.example.com\u002Fproducts\u002F${product.id}`);\n  \n  check(res, { 'product found': (r) => r.status === 200 });\n}\n```\n\n---\n\n## Thresholds & SLA\n\n### Basic Thresholds\n\n```javascript\nexport const options = {\n  vus: 50,\n  duration: '2m',\n  \n  thresholds: {\n    \u002F\u002F Response time thresholds\n    http_req_duration: ['p(95)\u003C500', 'p(99)\u003C1000'],\n    \n    \u002F\u002F Error rate threshold\n    http_req_failed: ['rate\u003C0.01'],\n    \n    \u002F\u002F Throughput threshold\n    http_reqs: ['rate>100'],\n  },\n};\n```\n\n### Advanced Thresholds\n\n```javascript\nexport const options = {\n  thresholds: {\n    \u002F\u002F Multiple thresholds on same metric\n    http_req_duration: [\n      'p(90)\u003C300',   \u002F\u002F 90th percentile \u003C 300ms\n      'p(95)\u003C500',  \u002F\u002F 95th percentile \u003C 500ms\n      'p(99)\u003C1000', \u002F\u002F 99th percentile \u003C 1s\n      'avg\u003C200',    \u002F\u002F average \u003C 200ms\n    ],\n    \n    \u002F\u002F Custom metrics\n    my_custom_metric: ['avg\u003C100'],\n    \n    \u002F\u002F Abort on threshold failure\n    'http_req_duration{method:GET}': ['p(95)\u003C300'],\n  },\n};\n```\n\n---\n\n## Custom Metrics\n\n### Counters\n\n```javascript\nimport http from 'k6\u002Fhttp';\nimport { Counter, Trend, Rate, Gauge } from 'k6\u002Fmetrics';\n\n\u002F\u002F Define custom metrics\nconst myCounter = new Counter('api_calls_total');\nconst responseTime = new Trend('response_time');\nconst errorRate = new Rate('error_rate');\nconst activeUsers = new Gauge('active_users');\n\nexport default function () {\n  const res = http.get('https:\u002F\u002Fapi.example.com\u002Fdata');\n  \n  \u002F\u002F Increment counter\n  myCounter.add(1);\n  \n  \u002F\u002F Add to trend (for percentiles)\n  responseTime.add(res.timings.duration);\n  \n  \u002F\u002F Track error rate\n  errorRate.add(res.status !== 200);\n  \n  \u002F\u002F Set gauge value\n  activeUsers.add(__VU);\n  \n  \u002F\u002F Tagged metrics\n  const taggedRes = http.get('https:\u002F\u002Fapi.example.com\u002Fusers', {\n    tags: { endpoint: 'users', env: 'prod' },\n  });\n}\n```\n\n---\n\n## CI\u002FCD Integration\n\n### GitHub Actions\n\n```yaml\n# .github\u002Fworkflows\u002Fload-test.yml\nname: Load Tests\n\non:\n  push:\n    branches: [main]\n  schedule:\n    - cron: '0 2 * * *'  # Daily at 2 AM\n\njobs:\n  load-test:\n    runs-on: ubuntu-latest\n    steps:\n      - uses: actions\u002Fcheckout@v4\n      \n      - name: Setup k6\n        uses: grafana\u002Fk6-action@v0.2.0\n        \n      - name: Run load test\n        env:\n          API_TOKEN: ${{ secrets.API_TOKEN }}\n        run: k6 run --out json=results.json load-test.js\n        \n      - name: Upload results\n        uses: actions\u002Fupload-artifact@v4\n        with:\n          name: k6-results\n          path: results.json\n          \n      - name: Check thresholds\n        if: failure()\n        run: |\n          echo \"Load test failed thresholds!\"\n          exit 1\n```\n\n### GitLab CI\n\n```yaml\n# .gitlab-ci.yml\nload_test:\n  image: grafana\u002Fk6:latest\n  script:\n    - k6 run load-test.js\n  artifacts:\n    when: always\n    paths:\n      - results.json\n    reports:\n      junit: results.xml\n```\n\n---\n\n## Results Analysis\n\n### Built-in Reports\n\n```bash\n# Text summary\nk6 run load-test.js\n\n# JSON output for parsing\nk6 run --out json=results.json load-test.js\n\n# InfluxDB + Grafana\nk6 run --out influxdb=http:\u002F\u002Flocalhost:8086\u002Fk6 load-test.js\n\n# Prometheus remote write\nk6 run --out prometheus=localhost:9090\u002Fk6 load-test.js\n\n# Cloud results\nk6 run --out cloud load-test.js\n```\n\n### Interpreting Results\n\n| Metric | Description | Good | Warning | Bad |\n|--------|-------------|------|---------|-----|\n| http_req_duration (p95) | 95% response time | \u003C 300ms | 300-500ms | > 500ms |\n| http_req_failed | Error rate | \u003C 0.1% | 0.1-1% | > 1% |\n| http_reqs | Requests\u002Fsec | Meeting target | Near limit | At limit |\n| vus | Virtual users | Stable | Gradual increase | Unexpected spike |\n\n---\n\n## Examples\n\n### Example 1: Basic API Load Test\n\n```javascript\nimport http from 'k6\u002Fhttp';\nimport { check, sleep } from 'k6';\n\nexport const options = {\n  vus: 50,\n  duration: '2m',\n  thresholds: {\n    http_req_duration: ['p(95)\u003C500'],\n    http_req_failed: ['rate\u003C0.01'],\n  },\n};\n\nexport default function () {\n  const res = http.get('https:\u002F\u002Fapi.example.com\u002Fusers');\n  \n  check(res, {\n    'status is 200': (r) => r.status === 200,\n    'response time \u003C 500ms': (r) => r.timings.duration \u003C 500,\n  });\n  \n  sleep(1);\n}\n```\n\n### Example 2: Test with Authentication and Data Parameterization\n\n```javascript\nimport http from 'k6\u002Fhttp';\nimport { check } from 'k6';\nimport { SharedArray } from 'k6\u002Fdata';\n\nconst users = new SharedArray('users', function () {\n  return JSON.parse(open('.\u002Fusers.json'));\n});\n\nexport default function () {\n  const user = users[__VU % users.length];\n  \n  const loginRes = http.post('https:\u002F\u002Fapi.example.com\u002Flogin',\n    JSON.stringify({ email: user.email, password: user.password })\n  );\n  \n  const token = loginRes.json('access_token');\n  \n  const headers = { 'Authorization': `Bearer ${token}` };\n  const res = http.get('https:\u002F\u002Fapi.example.com\u002Fprofile', { headers });\n  \n  check(res, { 'profile loaded': (r) => r.status === 200 });\n}\n```\n\n---\n\n## Best Practices\n\n- **Start with smoke test**: Verify test works with 1-5 VUs before scaling up\n- **Use realistic data**: Parameterize with real user data and behaviors\n- **Set meaningful thresholds**: Match your SLA and business requirements\n- **Warm up systems**: Include ramp-up time in stages\n- **Monitor external dependencies**: Track not just your APIs but downstream services\n- **Use tags**: Tag requests for granular analysis (`tags: { endpoint: 'users' }`)\n- **Keep tests focused**: One test file per scenario for clarity\n\n---\n\n## Common Pitfalls\n\n- **Problem:** Tests pass locally but fail in CI\n  **Solution:** Ensure CI environment has similar resources and network conditions\n\n- **Problem:** Inconsistent results between runs\n  **Solution:** Check for external dependencies, random data, or test data pollution\n\n- **Problem:** k6 runs out of memory\n  **Solution:** Use ` SharedArray` for large data, reduce VUs, or use `--max-memory` flag\n\n- **Problem:** Thresholds too strict\n  **Solution:** Start with relaxed thresholds, tighten based on historical data\n\n---\n\n## Related Skills\n\n- `@performance-engineer` - For broader performance optimization\n- `@api-testing-observability-api-mock` - For API mocking during testing\n- `@application-performance-performance-optimization` - For performance optimization\n\n---\n\n## Additional Resources\n\n- [k6 Documentation](https:\u002F\u002Fk6.io\u002Fdocs\u002F)\n- [k6 Examples](https:\u002F\u002Fgithub.com\u002Fgrafana\u002Fk6\u002Ftree\u002Fmaster\u002Fexamples)\n- [k6 Load Testing Guides](https:\u002F\u002Fk6.io\u002Fguides\u002F)\n- [k6 Cloud](https:\u002F\u002Fk6.io\u002Fcloud\u002F)\n\n## Limitations\n- Use this skill only when the task clearly matches the scope described above.\n- Do not treat the output as a substitute for environment-specific validation, testing, or expert review.\n- Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are 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