cypress/system-tests/projects/remote-debugging-port-removed/cypress.config.js

const la = require('lazy-ass')

module.exports = {
  'e2e': {
    'supportFile': false,
    setupNodeEvents (on, config) {
      on('before:browser:launch', (browser = {}, options) => {
        la(browser.family === 'chromium', 'this test can only be run with a chromium-family browser')

        // remove debugging port so that the browser connection fails
        const newArgs = options.args.filter((arg) => !arg.startsWith('--remote-debugging-port='))

        la(newArgs.length === options.args.length - 1, 'exactly one argument should have been removed')

        options.args = newArgs

        return options
      })

      return config
    },
  },
}