fail( [err] )

Immediately throw an error, aborting the current script iteration.

fail() is a simple convenience wrapper on top of JavaScript's throw(), because the latter cannot be used as [expr] || throw, which is a convenient way to write k6 test code.

Example

Aborting the current script iteration if a check fails:

import http from 'k6/http';
import { check, fail } from 'k6';

export default function () {
  const res = http.get('https://k6.io');
  if (
    !check(res, {
      'status code MUST be 200': (res) => res.status == 200,
    })
  ) {
    fail('status code was *not* 200');
  }
}