This is documentation for the next version of K6. For the latest stable release, go to the latest version.
config
Chai exposes a few options to change the library configuration.
Config option | Default | Description |
---|---|---|
truncateMsgThreshold | 300 | Check message length is truncated to this value. |
truncateVariableThreshold | 100 | Variables interpolated into check message are truncated to this length. It prevents mistakes when the check name is very large, especially when aggregateChecks is false . |
aggregateChecks | true | The actual values are not interpolated into the check message. Disable for tests with 1 iteration. |
logFailures | false | When the check fails, debug messages are printed. |
import http from 'k6/http';
import chai, { describe, expect } from 'https://jslib.k6.io/k6chaijs/4.3.4.3/index.js';
// individual variables should be up to 20 chars after rendering.
chai.config.truncateVariableThreshold = 20;
// whole check() message must be below 300 chars.
chai.config.truncateMsgThreshold = 300;
// the variable values (resp.status) are inserted into the check message - useful for debugging or tests with 1 iteration
chai.config.aggregateChecks = false;
// when the check fails, WARN messages with variables are printed. Useful for debugging.
chai.config.logFailures = true;
export default function testSuite() {
describe('Testing bad assertion.', () => {
const response = http.get('https://test-api.k6.io/');
expect(response.body).to.have.lengthOf.at.least(500);
});
}
The resulting
█ Testing bad assertion.
✓ expected '<!DOCTYPE html>\n<html lang="en">\n<hea...' to have property 'length'
✓ expected '<!DOCTYPE html>\n<html lang="en">\n<hea...' to have a length at least 500 got 15714