Scenario config file

Grafana k6 OSS Support
2

It is supposed to, the exported script options have a higher precedence than the JSON config. In ascending of order precedence, the options are consolidated like this: defaults < JSON config < script options < environment variables < CLI flags, see the options docs.

I tested this and scenarios from a JSON config files was correctly picked up by k6:

$ cat config.json 
{
    "scenarios": {
        "foo": {
            "executor": "constant-arrival-rate",
            "rate": 10,
            "timeUnit": "1s",
            "duration": "1m",
            "preAllocatedVUs": 20
        }
    }
}

$ cat http_get.js 
import http from 'k6/http';

export default function () {
  const response = http.get("https://test-api.k6.io/");
};

$ k6 run --config config.json http_get.js 

          /\      |‾‾| /‾‾/   /‾‾/   
     /\  /  \     |  |/  /   /  /    
    /  \/    \    |     (   /   ‾‾\  
   /          \   |  |\  \ |  (‾)  | 
  / __________ \  |__| \__\ \_____/ .io

  execution: local
     script: http_get.js
     output: -

  scenarios: (100.00%) 1 scenario, 20 max VUs, 1m30s max duration (incl. graceful stop):
           * foo: 10.00 iterations/s for 1m0s (maxVUs: 20, gracefulStop: 30s)
 ...

So, I guess that your exported script options contained one of these: scenarios / duration / stages /iterations, which overwrote the scenarios from the JSON config file.

And if this config precedence doesn’t work very well for you, there’s an alternative that’s very easy to use! :slight_smile: You can open() your JSON config files in your script’s init context, use JSON.parse() to parse them, and then re-export them (or parts of them) as the exported script options. And you can use k6 environment variables to dynamically load different config files in different test runs. For example, you can have this script:

import http from "k6/http";

let myOptions = JSON.parse(open(__ENV.TEST_TYPE));

export let options = {
    scenarios: myOptions.scenarios
    // ... other options, or just re-export the whole myOptions
};

export default function () {
    // ... 
}

And then run it with k6 run --env TEST_TYPE=smoke test.js, k6 run --env TEST_TYPE=load test.js, etc.