false.md

layout	page-api
title	assert.false()
excerpt	A strict boolean false comparison.
groups	assert
redirect_from	/assert/false/
version_added	2.11.0

false( actual, message = "" )

A strict comparison that passes if the first argument is boolean false.

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

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

This method is similar to the assertFalse() method found in xUnit-style frameworks.

assert.true() can be used to explicitly test for a true value.

Examples

QUnit.test('example', assert => {
  // success
  assert.false(false, 'boolean false');

  // failure
  assert.false('foo', 'non-empty string');
  assert.false('', 'empty string');
  assert.false(0, 'number zero');
  assert.false(true, 'boolean true');
  assert.false(NaN, 'NaN value');
  assert.false(null, 'null value');
  assert.false(undefined, 'undefined value');
});