notOk.md

layout	page-api
title	assert.notOk()
excerpt	Check if the first argument is falsy.
groups	assert
redirect_from	/assert/notOk/ /notOk/
version_added	1.18.0

notOk( state, message = "" )

A boolean check that passes when the first argument is falsy.

name	description
state	Expression being tested
message (string)	Short description

This assertion requires only one argument. If the argument evaluates to false, the assertion passes; otherwise, it fails.

To strictly compare against boolean false, use assert.false().

Examples

QUnit.test('example', assert => {
  // success
  assert.notOk(false, 'boolean false');
  assert.notOk('', 'empty string');
  assert.notOk(0, 'number zero');
  assert.notOk(NaN, 'NaN value');
  assert.notOk(null, 'null value');
  assert.notOk(undefined, 'undefined value');

  // failure
  assert.notOk('foo', 'non-empty string');
  assert.notOk(true, 'boolean true');
  assert.notOk(1, 'number one');
});