version added: 1.20

QUnit.test.only( name, callback )
QUnit.only( name, callback )

Add a test that is exclusively run, preventing other tests from running unless they are defined this way.

parameter description
name (string) Title of unit being tested
callback (function) Function to close over assertions

Callback parameters: callback( assert ):

parameter description
assert (object) A new instance object with the assertion methods


Use this method to focus your test suite on specific tests. QUnit.only will cause any other tests in your suite to be ignored.

This method is an alternative to re-running individual tests from the HTML reporter interface, and can be especially useful as it can be done upfront without first running the test suite, e.g. in a codebase with many long-running tests.

It can also be used instead of the --filter CLI option, e.g. if you’re already having the test open in your text editor. Similar to how one might use the debugger keyword.

When debugging a larger area of code, you may want to only run all tests within a given module. You can also useQUnit.module.only() to automatically mark all tests in a module as “only” tests.

QUnit 2.12 The QUnit.only() method was renamed to QUnit.test.only().
Use of QUnit.only() remains supported as an alias.
QUnit 1.20 The QUnit.only() method was introduced.


How to use QUnit.test.only to filter which tests are run.

QUnit.module( "robot", hooks => {
  let robot;
  hooks.beforeEach( () => {
    robot = new Robot();

  QUnit.test( "say()", assert => {
    assert.true( robot.say( "Hello" ) );

  // Run only this test
  // For example, you are working on changing this method.
  QUnit.test.only( "laser()", assert => {
    assert.true( robot.laser() );

  QUnit.test( "take()", assert => {
    assert.true( robot.take( 5 ) );