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Validating jQuery Plugin Integration and Event Handling in Bootstrap

This test suite validates the jQuery integration with Bootstrap components, ensuring proper plugin registration and event handling functionality. It verifies that all Bootstrap components are correctly registered as jQuery plugins and maintain compatibility with jQuery’s event system.

Test Coverage Overview

The test suite provides comprehensive coverage of Bootstrap’s jQuery plugin integration, focusing on component registration and event handling.

Tests plugin registration for 12 core Bootstrap components
Verifies jQuery interface mapping for each component
Validates event system compatibility using Alert component
Tests dynamic DOM manipulation through jQuery methods

Implementation Analysis

The testing approach utilizes Jest’s asynchronous testing capabilities with Promise-based assertions to verify jQuery event handling.

The implementation employs fixture-based testing patterns, with setup and teardown procedures to maintain test isolation. The tests leverage jQuery’s API for DOM manipulation and event triggering, ensuring compatibility between Bootstrap’s components and jQuery’s methods.

Technical Details

Testing Framework: Jest
jQuery Environment Configuration
Fixture Helpers: getFixture() and clearFixture()
Component Imports: Alert, Button, Carousel, etc.
Async Testing: Promise-based assertions
DOM Manipulation: jQuery selectors and methods

Best Practices Demonstrated

The test suite exemplifies high-quality testing practices by maintaining clear separation of concerns and proper test isolation.

Consistent beforeAll/afterEach hooks for test setup/cleanup
Isolated component testing
Async event handling verification
Comprehensive interface validation
Clean fixture management

twbs/bootstrap

js/tests/unit/jquery.spec.js

            
/* eslint-env jquery */

import Alert from '../../src/alert.js'
import Button from '../../src/button.js'
import Carousel from '../../src/carousel.js'
import Collapse from '../../src/collapse.js'
import Dropdown from '../../src/dropdown.js'
import Modal from '../../src/modal.js'
import Offcanvas from '../../src/offcanvas.js'
import Popover from '../../src/popover.js'
import ScrollSpy from '../../src/scrollspy.js'
import Tab from '../../src/tab.js'
import Toast from '../../src/toast.js'
import Tooltip from '../../src/tooltip.js'
import { clearFixture, getFixture } from '../helpers/fixture.js'

describe('jQuery', () => {
  let fixtureEl

  beforeAll(() => {
    fixtureEl = getFixture()
  })

  afterEach(() => {
    clearFixture()
  })

  it('should add all plugins in jQuery', () => {
    expect(Alert.jQueryInterface).toEqual(jQuery.fn.alert)
    expect(Button.jQueryInterface).toEqual(jQuery.fn.button)
    expect(Carousel.jQueryInterface).toEqual(jQuery.fn.carousel)
    expect(Collapse.jQueryInterface).toEqual(jQuery.fn.collapse)
    expect(Dropdown.jQueryInterface).toEqual(jQuery.fn.dropdown)
    expect(Modal.jQueryInterface).toEqual(jQuery.fn.modal)
    expect(Offcanvas.jQueryInterface).toEqual(jQuery.fn.offcanvas)
    expect(Popover.jQueryInterface).toEqual(jQuery.fn.popover)
    expect(ScrollSpy.jQueryInterface).toEqual(jQuery.fn.scrollspy)
    expect(Tab.jQueryInterface).toEqual(jQuery.fn.tab)
    expect(Toast.jQueryInterface).toEqual(jQuery.fn.toast)
    expect(Tooltip.jQueryInterface).toEqual(jQuery.fn.tooltip)
  })

  it('should use jQuery event system', () => {
    return new Promise(resolve => {
      fixtureEl.innerHTML = [
        '<div class="alert">',
        '  <button type="button" data-bs-dismiss="alert">x</button>',
        '</div>'
      ].join('')

      $(fixtureEl).find('.alert')
        .one('closed.bs.alert', () => {
          expect($(fixtureEl).find('.alert')).toHaveSize(0)
          resolve()
        })

      $(fixtureEl).find('button').trigger('click')
    })
  })
})