--- title: "config | Grafana k6 documentation" description: "Global configuration options for k6Chaijs" --- > For a curated documentation index, see [llms.txt](/llms.txt). For the complete documentation index, see [llms-full.txt](/llms-full.txt). # config Chai exposes a few options to change the library configuration. Expand table | 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. | JavaScript ![Copy code to clipboard](/media/images/icons/icon-copy-small-2.svg) Copy ```javascript 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://quickpizza.grafana.com'); expect(response.body).to.have.lengthOf.at.least(100); }); } ``` Resulting in: Bash ![Copy code to clipboard](/media/images/icons/icon-copy-small-2.svg) Copy ```bash █ Testing bad assertion. ✓ expected '\n\n\n\n