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toBeFalsy()

The toBeFalsy() method asserts that a value is falsy in JavaScript. A value is falsy if it converts to false when evaluated in a boolean context.

Syntax

JavaScript 
expect(actual).toBeFalsy();
expect(actual).not.toBeFalsy();

Returns

TypeDescription
voidNo return value

Description

The toBeFalsy() method checks if a value is falsy. In JavaScript, the following values are falsy:

  • false
  • 0
  • -0
  • 0n (BigInt)
  • "" (empty string)
  • null
  • undefined
  • NaN

All other values are truthy.

Usage

JavaScript 
import { expect } from 'https://jslib.k6.io/k6-testing/0.5.0/index.js';

export default function () {
  expect(false).toBeFalsy();
  expect(0).toBeFalsy();
  expect(-0).toBeFalsy();
  expect(0n).toBeFalsy();
  expect('').toBeFalsy();
  expect(null).toBeFalsy();
  expect(undefined).toBeFalsy();
  expect(NaN).toBeFalsy();
}