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72 lines
3.0 KiB
Markdown
72 lines
3.0 KiB
Markdown
## How does Bootstrap's test suite work?
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Bootstrap uses [Jasmine](https://jasmine.github.io/). Each plugin has a file dedicated to its tests in `tests/unit/<plugin-name>.spec.js`.
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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 the unit test suite via [Karma](https://karma-runner.github.io/), run `npm run js-test`.
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To run the unit test suite via [Karma](https://karma-runner.github.io/) and debug, run `npm run js-debug`.
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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 (`tests/unit/<plugin-name>.spec.js`).
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2. Review the [Jasmine API Documentation](https://jasmine.github.io/pages/docs_home.html) 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 `npm run js-test` 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 be in the corresponding `describe`.
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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 use [`expect`](https://jasmine.github.io/api/edge/matchers.html) to ensure something is expected.
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- Each test should follow the project's [JavaScript Code Guidelines](https://github.com/twbs/bootstrap/blob/main/.github/CONTRIBUTING.md#js)
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## Code coverage
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Currently we're aiming for at least 90% test coverage for our code. To ensure your changes meet or exceed this limit, run `npm run js-test-karma` and open the file in `js/coverage/lcov-report/index.html` to see the code coverage for each plugin. See more details when you select a plugin and ensure your change is fully covered by unit tests.
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### Example tests
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```js
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// Synchronous test
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describe('getInstance', () => {
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it('should return null if there is no instance', () => {
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// Make assertion
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expect(Tab.getInstance(fixtureEl)).toBeNull()
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})
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it('should return this instance', () => {
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fixtureEl.innerHTML = '<div></div>'
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const divEl = fixtureEl.querySelector('div')
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const tab = new Tab(divEl)
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// Make assertion
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expect(Tab.getInstance(divEl)).toEqual(tab)
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})
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})
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// Asynchronous test
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it('should show a tooltip without the animation', done => {
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fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
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const tooltipEl = fixtureEl.querySelector('a')
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const tooltip = new Tooltip(tooltipEl, {
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animation: false
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})
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tooltipEl.addEventListener('shown.bs.tooltip', () => {
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const tip = document.querySelector('.tooltip')
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expect(tip).not.toBeNull()
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expect(tip.classList.contains('fade')).toEqual(false)
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done()
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})
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tooltip.show()
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})
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```
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