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expect.js library is no longer maintained

expect.js library has been deprecated in favor of Chaijs.

Please migrate to the k6Chaijs library. The documentation below is retained for historical reasons.

toBeTruthy() is a comparison function that evaluates to true or false. It must be called in the chain after the t.expect(value) or .and(value).

When toBeTruthy() evaluates to false, the chain is broken, and the test is marked as failed. When the chain is broken, further checks inside of the test are omitted.


FunkFunk object


import { describe } from '';
import http from 'k6/http';
export default function testSuite() {
describe('Basic test', (t) => {
t.expect(1).toBeTruthy(); // true
t.expect('hello').toBeTruthy(); // true
t.expect(3.14).toBeTruthy(); // true
t.expect([]).toBeTruthy(); // true
t.expect({}).toBeTruthy(); // true
t.expect(true).toBeTruthy(); // true
t.expect('1').toBeTruthy(); // true
t.expect(0).toBeTruthy(); // false
t.expect(undefined).toBeTruthy(); // false
t.expect(NaN).toBeTruthy(); // false
t.expect(false).toBeTruthy(); // false
t.expect('').toBeTruthy(); // false