@revoloo/cypress6/packages/server/test/e2e/5_screenshot_viewport_capture_spec.js

Cypress.io end to end testing tool

const e2e = require('../support/helpers/e2e').default

const onServer = (app) => {
  return app.get('/viewport', e2e.sendHtml(`\
<div class="black-me-out" style="position: fixed; left: 10px; top: 10px; width: 10px; height: 10px;"></div>
<div class="black-me-out" style="position: absolute; left: 30px; top: 10px; width: 10px; height: 10px;"></div>\
`))
}

describe('e2e screenshot viewport capture', () => {
  e2e.setup({
    servers: {
      port: 3322,
      onServer,
    },
  })

  // this tests that consistent screenshots are taken for app
  // captures (namely that the runner UI is hidden)
  e2e.it('passes', {
    spec: 'screenshot_viewport_capture_spec.js',
    snapshot: true,
  })
})