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().


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');