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fail( [err] )

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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.

err (optional)stringError message that gets printed to stderr.


Aborting the current script iteration if a check fails:

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

export default function() {
  let res = http.get("");
  if (!check(res, {
    "status code MUST be 200": (res) => res.status == 200,
  })) {
    fail("status code was *not* 200");