main.js

import http from 'k6/http'
import { check, sleep } from 'k6'
import exec from 'k6/execution'

// This configuration only executes 1 test, enough for a smoketest
export const options = {
  vus: 1,
  iterations: 1,
}

export default () => {
  // define the graphql request
  const params = {
    headers: {
      'Content-Type': 'application/json',
    },
  }
  const query = `query{topics{totalResults}}`

  // perform the graphql request
  const response = http.post(`${__ENV.BASE_URL}`, JSON.stringify({ query }), params)

  // define the tests
  const testResults = [
    check(response, {
      'is status 200': (r) => r.status === 200,
    }),
    check(JSON.parse(response.body), {
      // there can be multiple tests here, e.g.
      //"contains topics object": (r) => typeof r.data.topics != null,
      'contains totalResults count': (r) => typeof r.data.topics.totalResults == 'number',
    }),
  ]

  // fail on any unmet expectations. We need to do this explicitly, because k6 is a load testing tool
  if (testResults.includes(false)) {
    exec.test.abort('smoke test failed')
  }
}