62 lines
2.6 KiB
Markdown
62 lines
2.6 KiB
Markdown
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## How does Bootstrap's test suite work?
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Bootstrap uses [QUnit](https://api.qunitjs.com/), a powerful, easy-to-use JavaScript unit test framework. Each plugin has a file dedicated to its tests in `unit/<plugin-name>.js`.
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* `unit/` contains the unit test files for each Bootstrap plugin.
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* `vendor/` contains jQuery.
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* `visual/` contains "visual" tests which are run interactively in real browsers and require manual verification by humans.
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To run our unit tests on a real web browser [Karma](https://karma-runner.github.io/2.0/index.html), run `grunt test-js` or you can
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open `index.html`.
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## How do I add a new unit test?
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1. Locate and open the file dedicated to the plugin which you need to add tests to (`unit/<plugin-name>.js`).
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2. Review the [QUnit API Documentation](https://api.qunitjs.com/) and use the existing tests as references for how to structure your new tests.
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3. Write the necessary unit test(s) for the new or revised functionality.
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4. Run `grunt test-js` to see the results of your newly-added test(s).
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**Note:** Your new unit tests should fail before your changes are applied to the plugin, and should pass after your changes are applied to the plugin.
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## What should a unit test look like?
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* Each test should have a unique name clearly stating what unit is being tested.
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* Each test should test only one unit per test, although one test can include several assertions. Create multiple tests for multiple units of functionality.
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* Each test should begin with [`assert.expect`](https://api.qunitjs.com/expect/) to ensure that the expected assertions are run.
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* Each test should follow the project's [JavaScript Code Guidelines](https://github.com/twbs/bootstrap/blob/master/CONTRIBUTING.md#js)
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### Example tests
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```javascript
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// Synchronous test
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QUnit.test('should describe the unit being tested', function (assert) {
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assert.expect(1)
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var templateHTML = '<div class="alert alert-danger fade in">'
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+ '<a class="close" href="#" data-dismiss="alert">×</a>'
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+ '<p><strong>Template necessary for the test.</p>'
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+ '</div>'
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var $alert = $(templateHTML).appendTo('#qunit-fixture').bootstrapAlert()
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$alert.find('.close').click()
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// Make assertion
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assert.strictEqual($alert.hasClass('in'), false, 'remove .in class on .close click')
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})
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// Asynchronous test
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QUnit.test('should describe the unit being tested', function (assert) {
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assert.expect(1)
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var done = assert.async()
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$('<div title="tooltip title"></div>')
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.appendTo('#qunit-fixture')
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.on('shown.bs.tooltip', function () {
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assert.ok(true, '"shown" event was fired after calling "show"')
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done()
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})
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.bootstrapTooltip('show')
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})
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```
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