rewrite carousel unit tests

2 files changed, 1204 insertions, 11 deletions

diff --git a/js/src/carousel.js b/js/src/carousel/carousel.js
index 7cd790f85..0e1bad14a 100644
--- a/js/src/carousel.js
+++ b/js/src/carousel/carousel.js
@@ -16,11 +16,11 @@ import {
   reflow,
   triggerTransitionEnd,
   typeCheckConfig
-} from './util/index'
-import Data from './dom/data'
-import EventHandler from './dom/event-handler'
-import Manipulator from './dom/manipulator'
-import SelectorEngine from './dom/selector-engine'
+} from '../util/index'
+import Data from '../dom/data'
+import EventHandler from '../dom/event-handler'
+import Manipulator from '../dom/manipulator'
+import SelectorEngine from '../dom/selector-engine'
 
 /**
  * ------------------------------------------------------------------------
@@ -283,16 +283,12 @@ class Carousel {
         .on(this._element, Event.MOUSELEAVE, event => this.cycle(event))
     }
 
-    if (this._config.touch) {
+    if (this._config.touch && this._touchSupported) {
       this._addTouchEventListeners()
     }
   }
 
   _addTouchEventListeners() {
-    if (!this._touchSupported) {
-      return
-    }
-
     const start = event => {
       if (this._pointerEvent && PointerType[event.pointerType.toUpperCase()]) {
         this.touchStartX = event.clientX
@@ -631,7 +627,7 @@ EventHandler.on(window, Event.LOAD_DATA_API, () => {
  * ------------------------------------------------------------------------
  * add .carousel to jQuery only if jQuery is present
  */
-
+/* istanbul ignore if */
 if (typeof $ !== 'undefined') {
   const JQUERY_NO_CONFLICT = $.fn[NAME]
   $.fn[NAME] = Carousel._jQueryInterface
diff --git a/js/src/carousel/carousel.spec.js b/js/src/carousel/carousel.spec.js
new file mode 100644
index 000000000..9f897110d
--- /dev/null
+++ b/js/src/carousel/carousel.spec.js
@@ -0,0 +1,1197 @@
+import Carousel from './carousel'
+import EventHandler from '../dom/event-handler'
+
+/** Test helpers */
+import { getFixture, clearFixture, createEvent, jQueryMock } from '../../tests/helpers/fixture'
+
+describe('Carousel', () => {
+  const { Simulator, PointerEvent, MSPointerEvent } = window
+  const originWinPointerEvent = PointerEvent || MSPointerEvent
+  const supportPointerEvent = Boolean(PointerEvent || MSPointerEvent)
+
+  window.MSPointerEvent = null
+  const cssStyleCarousel = '.carousel.pointer-event { -ms-touch-action: none; touch-action: none; }'
+
+  const stylesCarousel = document.createElement('style')
+  stylesCarousel.type = 'text/css'
+  stylesCarousel.appendChild(document.createTextNode(cssStyleCarousel))
+
+  const clearPointerEvents = () => {
+    window.PointerEvent = null
+  }
+
+  const restorePointerEvents = () => {
+    window.PointerEvent = originWinPointerEvent
+  }
+
+  let fixtureEl
+
+  beforeAll(() => {
+    fixtureEl = getFixture()
+  })
+
+  afterEach(() => {
+    clearFixture()
+  })
+
+  describe('VERSION', () => {
+    it('should return plugin version', () => {
+      expect(Carousel.VERSION).toEqual(jasmine.any(String))
+    })
+  })
+
+  describe('Default', () => {
+    it('should return plugin default config', () => {
+      expect(Carousel.Default).toEqual(jasmine.any(Object))
+    })
+  })
+
+  describe('constructor', () => {
+    it('should go to next item if right arrow key is pressed', done => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div class="carousel-item active">item 1</div>',
+        '    <div id="item2" class="carousel-item">item 2</div>',
+        '    <div class="carousel-item">item 3</div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('#myCarousel')
+      const carousel = new Carousel(carouselEl, {
+        keyboard: true
+      })
+
+      spyOn(carousel, '_keydown').and.callThrough()
+
+      carouselEl.addEventListener('slid.bs.carousel', () => {
+        expect(fixtureEl.querySelector('.active')).toEqual(fixtureEl.querySelector('#item2'))
+        expect(carousel._keydown).toHaveBeenCalled()
+        done()
+      })
+
+      const keyDown = createEvent('keydown')
+      keyDown.which = 39
+
+      carouselEl.dispatchEvent(keyDown)
+    })
+
+    it('should go to previous item if left arrow key is pressed', done => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div id="item1" class="carousel-item">item 1</div>',
+        '    <div class="carousel-item active">item 2</div>',
+        '    <div class="carousel-item">item 3</div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('#myCarousel')
+      const carousel = new Carousel(carouselEl, {
+        keyboard: true
+      })
+
+      spyOn(carousel, '_keydown').and.callThrough()
+
+      carouselEl.addEventListener('slid.bs.carousel', () => {
+        expect(fixtureEl.querySelector('.active')).toEqual(fixtureEl.querySelector('#item1'))
+        expect(carousel._keydown).toHaveBeenCalled()
+        done()
+      })
+
+      const keyDown = createEvent('keydown')
+      keyDown.which = 37
+
+      carouselEl.dispatchEvent(keyDown)
+    })
+
+    it('should not prevent keydown if key is not ARROW_LEFT or ARROW_RIGHT', done => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div class="carousel-item active">item 1</div>',
+        '    <div class="carousel-item">item 2</div>',
+        '    <div class="carousel-item">item 3</div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('#myCarousel')
+      const carousel = new Carousel(carouselEl, {
+        keyboard: true
+      })
+
+      spyOn(carousel, '_keydown').and.callThrough()
+
+      carouselEl.addEventListener('keydown', event => {
+        expect(carousel._keydown).toHaveBeenCalled()
+        expect(event.defaultPrevented).toEqual(false)
+        done()
+      })
+
+      const keyDown = createEvent('keydown')
+      keyDown.which = 40
+
+      carouselEl.dispatchEvent(keyDown)
+    })
+
+    it('should ignore keyboard events within <input>s and <textarea>s', () => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div class="carousel-item active">',
+        '      <input type="text" />',
+        '      <textarea></textarea>',
+        '    </div>',
+        '    <div class="carousel-item"></div>',
+        '    <div class="carousel-item">item 3</div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('#myCarousel')
+      const input = fixtureEl.querySelector('input')
+      const textarea = fixtureEl.querySelector('textarea')
+      const carousel = new Carousel(carouselEl, {
+        keyboard: true
+      })
+
+      const spyKeyDown = spyOn(carousel, '_keydown').and.callThrough()
+      const spyPrev = spyOn(carousel, 'prev')
+      const spyNext = spyOn(carousel, 'next')
+
+      const keyDown = createEvent('keydown', { bubbles: true, cancelable: true })
+      keyDown.which = 39
+      Object.defineProperty(keyDown, 'target', {
+        value: input,
+        writable: true,
+        configurable: true
+      })
+
+      input.dispatchEvent(keyDown)
+
+      expect(spyKeyDown).toHaveBeenCalled()
+      expect(spyPrev).not.toHaveBeenCalled()
+      expect(spyNext).not.toHaveBeenCalled()
+
+      spyKeyDown.calls.reset()
+      spyPrev.calls.reset()
+      spyNext.calls.reset()
+
+      Object.defineProperty(keyDown, 'target', {
+        value: textarea
+      })
+      textarea.dispatchEvent(keyDown)
+
+      expect(spyKeyDown).toHaveBeenCalled()
+      expect(spyPrev).not.toHaveBeenCalled()
+      expect(spyNext).not.toHaveBeenCalled()
+    })
+
+    it('should wrap around from end to start when wrap option is true', done => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div id="one" class="carousel-item active"></div>',
+        '    <div id="two" class="carousel-item"></div>',
+        '    <div id="three" class="carousel-item">item 3</div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('#myCarousel')
+      const carousel = new Carousel(carouselEl, { wrap: true })
+      const getActiveId = () => {
+        return carouselEl.querySelector('.carousel-item.active').getAttribute('id')
+      }
+
+      carouselEl.addEventListener('slid.bs.carousel', e => {
+        const activeId = getActiveId()
+
+        if (activeId === 'two') {
+          carousel.next()
+          return
+        }
+
+        if (activeId === 'three') {
+          carousel.next()
+          return
+        }
+
+        if (activeId === 'one') {
+          // carousel wrapped around and slid from 3rd to 1st slide
+          expect(activeId).toEqual('one')
+          expect(e.from + 1).toEqual(3)
+          done()
+        }
+      })
+
+      carousel.next()
+    })
+
+    it('should stay at the start when the prev method is called and wrap is false', done => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div id="one" class="carousel-item active"></div>',
+        '    <div id="two" class="carousel-item"></div>',
+        '    <div id="three" class="carousel-item">item 3</div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('#myCarousel')
+      const firstElement = fixtureEl.querySelector('#one')
+      const carousel = new Carousel(carouselEl, { wrap: false })
+
+      carouselEl.addEventListener('slid.bs.carousel', () => {
+        throw new Error('carousel slid when it should not have slid')
+      })
+
+      carousel.prev()
+
+      setTimeout(() => {
+        expect(firstElement.classList.contains('active')).toEqual(true)
+        done()
+      }, 10)
+    })
+
+    it('should not add touch event listeners if touch = false', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const carouselEl = fixtureEl.querySelector('div')
+
+      spyOn(Carousel.prototype, '_addTouchEventListeners')
+
+      const carousel = new Carousel(carouselEl, {
+        touch: false
+      })
+
+      expect(carousel._addTouchEventListeners).not.toHaveBeenCalled()
+    })
+
+    it('should not add touch event listeners if touch supported = false', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const carouselEl = fixtureEl.querySelector('div')
+
+      const carousel = new Carousel(carouselEl)
+
+      EventHandler.off(carouselEl, '.bs-carousel')
+      carousel._touchSupported = false
+
+      spyOn(carousel, '_addTouchEventListeners')
+
+      carousel._addEventListeners()
+
+      expect(carousel._addTouchEventListeners).not.toHaveBeenCalled()
+    })
+
+    it('should add touch event listeners by default', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const carouselEl = fixtureEl.querySelector('div')
+
+      spyOn(Carousel.prototype, '_addTouchEventListeners')
+
+      document.documentElement.ontouchstart = () => {}
+      const carousel = new Carousel(carouselEl)
+
+      expect(carousel._addTouchEventListeners).toHaveBeenCalled()
+    })
+
+    it('should allow swiperight and call prev with pointer events', done => {
+      if (!supportPointerEvent) {
+        expect().nothing()
+        done()
+        return
+      }
+
+      document.documentElement.ontouchstart = () => {}
+      document.head.appendChild(stylesCarousel)
+      Simulator.setType('pointer')
+
+      fixtureEl.innerHTML = [
+        '<div class="carousel" data-interval="false">',
+        '  <div class="carousel-inner">',
+        '    <div id="item" class="carousel-item">',
+        '      <img alt="">',
+        '    </div>',
+        '    <div class="carousel-item active">',
+        '      <img alt="">',
+        '    </div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('.carousel')
+      const item = fixtureEl.querySelector('#item')
+      const carousel = new Carousel(carouselEl)
+
+      spyOn(carousel, 'prev').and.callThrough()
+
+      carouselEl.addEventListener('slid.bs.carousel', () => {
+        expect(item.classList.contains('active')).toEqual(true)
+        expect(carousel.prev).toHaveBeenCalled()
+        document.head.removeChild(stylesCarousel)
+        delete document.documentElement.ontouchstart
+        done()
+      })
+
+      Simulator.gestures.swipe(carouselEl, {
+        deltaX: 300,
+        deltaY: 0
+      })
+    })
+
+    it('should allow swipeleft and call next with pointer events', done => {
+      if (!supportPointerEvent) {
+        expect().nothing()
+        done()
+        return
+      }
+
+      document.documentElement.ontouchstart = () => {}
+      document.head.appendChild(stylesCarousel)
+      Simulator.setType('pointer')
+
+      fixtureEl.innerHTML = [
+        '<div class="carousel" data-interval="false">',
+        '  <div class="carousel-inner">',
+        '    <div id="item" class="carousel-item active">',
+        '      <img alt="">',
+        '    </div>',
+        '    <div class="carousel-item">',
+        '      <img alt="">',
+        '    </div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('.carousel')
+      const item = fixtureEl.querySelector('#item')
+      const carousel = new Carousel(carouselEl)
+
+      spyOn(carousel, 'next').and.callThrough()
+
+      carouselEl.addEventListener('slid.bs.carousel', () => {
+        expect(item.classList.contains('active')).toEqual(false)
+        expect(carousel.next).toHaveBeenCalled()
+        document.head.removeChild(stylesCarousel)
+        delete document.documentElement.ontouchstart
+        done()
+      })
+
+      Simulator.gestures.swipe(carouselEl, {
+        pos: [300, 10],
+        deltaX: -300,
+        deltaY: 0
+      })
+    })
+
+    it('should allow swiperight and call prev with touch events', done => {
+      Simulator.setType('touch')
+      clearPointerEvents()
+      document.documentElement.ontouchstart = () => {}
+
+      fixtureEl.innerHTML = [
+        '<div class="carousel" data-interval="false">',
+        '  <div class="carousel-inner">',
+        '    <div id="item" class="carousel-item">',
+        '      <img alt="">',
+        '    </div>',
+        '    <div class="carousel-item active">',
+        '      <img alt="">',
+        '    </div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('.carousel')
+      const item = fixtureEl.querySelector('#item')
+      const carousel = new Carousel(carouselEl)
+
+      spyOn(carousel, 'prev').and.callThrough()
+
+      carouselEl.addEventListener('slid.bs.carousel', () => {
+        expect(item.classList.contains('active')).toEqual(true)
+        expect(carousel.prev).toHaveBeenCalled()
+        delete document.documentElement.ontouchstart
+        restorePointerEvents()
+        done()
+      })
+
+      Simulator.gestures.swipe(carouselEl, {
+        deltaX: 300,
+        deltaY: 0
+      })
+    })
+
+    it('should allow swipeleft and call next with touch events', done => {
+      Simulator.setType('touch')
+      clearPointerEvents()
+      document.documentElement.ontouchstart = () => {}
+
+      fixtureEl.innerHTML = [
+        '<div class="carousel" data-interval="false">',
+        '  <div class="carousel-inner">',
+        '    <div id="item" class="carousel-item active">',
+        '      <img alt="">',
+        '    </div>',
+        '    <div class="carousel-item">',
+        '      <img alt="">',
+        '    </div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('.carousel')
+      const item = fixtureEl.querySelector('#item')
+      const carousel = new Carousel(carouselEl)
+
+      spyOn(carousel, 'next').and.callThrough()
+
+      carouselEl.addEventListener('slid.bs.carousel', () => {
+        expect(item.classList.contains('active')).toEqual(false)
+        expect(carousel.next).toHaveBeenCalled()
+        delete document.documentElement.ontouchstart
+        restorePointerEvents()
+        done()
+      })
+
+      Simulator.gestures.swipe(carouselEl, {
+        pos: [300, 10],
+        deltaX: -300,
+        deltaY: 0
+      })
+    })
+
+    it('should not allow pinch with touch events', done => {
+      Simulator.setType('touch')
+      clearPointerEvents()
+      document.documentElement.ontouchstart = () => {}
+
+      fixtureEl.innerHTML = '<div class="carousel" data-interval="false"></div>'
+
+      const carouselEl = fixtureEl.querySelector('.carousel')
+      const carousel = new Carousel(carouselEl)
+
+      Simulator.gestures.swipe(carouselEl, {
+        pos: [300, 10],
+        deltaX: -300,
+        deltaY: 0,
+        touches: 2
+      }, () => {
+        restorePointerEvents()
+        delete document.documentElement.ontouchstart
+        expect(carousel.touchDeltaX).toEqual(0)
+        done()
+      })
+    })
+
+    it('should call pause method on mouse over with pause equal to hover', done => {
+      fixtureEl.innerHTML = '<div class="carousel"></div>'
+
+      const carouselEl = fixtureEl.querySelector('.carousel')
+      const carousel = new Carousel(carouselEl)
+
+      spyOn(carousel, 'pause')
+
+      const mouseOverEvent = createEvent('mouseover')
+      carouselEl.dispatchEvent(mouseOverEvent)
+
+      setTimeout(() => {
+        expect(carousel.pause).toHaveBeenCalled()
+        done()
+      }, 10)
+    })
+
+    it('should call cycle on mouse out with pause equal to hover', done => {
+      fixtureEl.innerHTML = '<div class="carousel"></div>'
+
+      const carouselEl = fixtureEl.querySelector('.carousel')
+      const carousel = new Carousel(carouselEl)
+
+      spyOn(carousel, 'cycle')
+
+      const mouseOutEvent = createEvent('mouseout')
+      carouselEl.dispatchEvent(mouseOutEvent)
+
+      setTimeout(() => {
+        expect(carousel.cycle).toHaveBeenCalled()
+        done()
+      }, 10)
+    })
+  })
+
+  describe('next', () => {
+    it('should not slide if the carousel is sliding', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const carouselEl = fixtureEl.querySelector('div')
+      const carousel = new Carousel(carouselEl, {})
+
+      spyOn(carousel, '_slide')
+
+      carousel._isSliding = true
+      carousel.next()
+
+      expect(carousel._slide).not.toHaveBeenCalled()
+    })
+
+    it('should not fire slid when slide is prevented', done => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const carouselEl = fixtureEl.querySelector('div')
+      const carousel = new Carousel(carouselEl, {})
+      let slidEvent = false
+
+      const doneTest = () => {
+        setTimeout(() => {
+          expect(slidEvent).toEqual(false)
+          done()
+        }, 20)
+      }
+
+      carouselEl.addEventListener('slide.bs.carousel', e => {
+        e.preventDefault()
+        doneTest()
+      })
+
+      carouselEl.addEventListener('slid.bs.carousel', () => {
+        slidEvent = true
+      })
+
+      carousel.next()
+    })
+
+    it('should fire slide event with: direction, relatedTarget, from and to', done => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div class="carousel-item active">item 1</div>',
+        '    <div class="carousel-item">item 2</div>',
+        '    <div class="carousel-item">item 3</div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('#myCarousel')
+      const carousel = new Carousel(carouselEl, {})
+
+      const onSlide = e => {
+        expect(e.direction).toEqual('left')
+        expect(e.relatedTarget.classList.contains('carousel-item')).toEqual(true)
+        expect(e.from).toEqual(0)
+        expect(e.to).toEqual(1)
+
+        carouselEl.removeEventListener('slide.bs.carousel', onSlide)
+        carouselEl.addEventListener('slide.bs.carousel', onSlide2)
+
+        carousel.prev()
+      }
+
+      const onSlide2 = e => {
+        expect(e.direction).toEqual('right')
+        done()
+      }
+
+      carouselEl.addEventListener('slide.bs.carousel', onSlide)
+      carousel.next()
+    })
+
+    it('should fire slid event with: direction, relatedTarget, from and to', done => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div class="carousel-item active">item 1</div>',
+        '    <div class="carousel-item">item 2</div>',
+        '    <div class="carousel-item">item 3</div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('#myCarousel')
+      const carousel = new Carousel(carouselEl, {})
+
+      const onSlid = e => {
+        expect(e.direction).toEqual('left')
+        expect(e.relatedTarget.classList.contains('carousel-item')).toEqual(true)
+        expect(e.from).toEqual(0)
+        expect(e.to).toEqual(1)
+
+        carouselEl.removeEventListener('slid.bs.carousel', onSlid)
+        carouselEl.addEventListener('slid.bs.carousel', onSlid2)
+
+        carousel.prev()
+      }
+
+      const onSlid2 = e => {
+        expect(e.direction).toEqual('right')
+        done()
+      }
+
+      carouselEl.addEventListener('slid.bs.carousel', onSlid)
+      carousel.next()
+    })
+
+    it('should get interval from data attribute in individual item', () => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div class="carousel-item active">item 1</div>',
+        '    <div class="carousel-item" data-interval="7">item 2</div>',
+        '    <div class="carousel-item">item 3</div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('#myCarousel')
+      const carousel = new Carousel(carouselEl, {
+        interval: 1814
+      })
+
+      expect(carousel._config.interval).toEqual(1814)
+
+      carousel.next()
+
+      expect(carousel._config.interval).toEqual(7)
+    })
+
+    it('should update indicators if present', done => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <ol class="carousel-indicators">',
+        '    <li data-target="#myCarousel" data-slide-to="0" class="active"></li>',
+        '    <li id="secondIndicator" data-target="#myCarousel" data-slide-to="1"></li>',
+        '    <li data-target="#myCarousel" data-slide-to="2"></li>',
+        '  </ol>',
+        '  <div class="carousel-inner">',
+        '    <div class="carousel-item active">item 1</div>',
+        '    <div class="carousel-item" data-interval="7">item 2</div>',
+        '    <div class="carousel-item">item 3</div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('#myCarousel')
+      const secondIndicator = fixtureEl.querySelector('#secondIndicator')
+      const carousel = new Carousel(carouselEl)
+
+      carouselEl.addEventListener('slid.bs.carousel', () => {
+        expect(secondIndicator.classList.contains('active')).toEqual(true)
+        done()
+      })
+
+      carousel.next()
+    })
+  })
+
+  describe('nextWhenVisible', () => {
+    it('should not call next when the page is not visible', () => {
+      fixtureEl.innerHTML = '<div class="carousel" data-interval="false"></div>'
+
+      const carouselEl = fixtureEl.querySelector('div')
+      const carousel = new Carousel(carouselEl)
+
+      spyOn(carousel, 'next')
+
+      carousel.nextWhenVisible()
+
+      expect(carousel.next).not.toHaveBeenCalled()
+    })
+  })
+
+  describe('prev', () => {
+    it('should not slide if the carousel is sliding', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const carouselEl = fixtureEl.querySelector('div')
+      const carousel = new Carousel(carouselEl, {})
+
+      spyOn(carousel, '_slide')
+
+      carousel._isSliding = true
+      carousel.prev()
+
+      expect(carousel._slide).not.toHaveBeenCalled()
+    })
+  })
+
+  describe('pause', () => {
+    it('should call cycle if the carousel have carousel-item-next and carousel-item-prev class', () => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div class="carousel-item active">item 1</div>',
+        '    <div class="carousel-item carousel-item-next">item 2</div>',
+        '    <div class="carousel-item">item 3</div>',
+        '  </div>',
+        '  <div class="carousel-control-prev"></div>',
+        '  <div class="carousel-control-next"></div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('#myCarousel')
+      const carousel = new Carousel(carouselEl)
+
+      spyOn(carousel, 'cycle')
+      spyOn(window, 'clearInterval')
+
+      carousel.pause()
+
+      expect(carousel.cycle).toHaveBeenCalledWith(true)
+      expect(window.clearInterval).toHaveBeenCalled()
+      expect(carousel._isPaused).toEqual(true)
+    })
+
+    it('should not call cycle if nothing is in transition', () => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div class="carousel-item active">item 1</div>',
+        '    <div class="carousel-item">item 2</div>',
+        '    <div class="carousel-item">item 3</div>',
+        '  </div>',
+        '  <div class="carousel-control-prev"></div>',
+        '  <div class="carousel-control-next"></div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('#myCarousel')
+      const carousel = new Carousel(carouselEl)
+
+      spyOn(carousel, 'cycle')
+      spyOn(window, 'clearInterval')
+
+      carousel.pause()
+
+      expect(carousel.cycle).not.toHaveBeenCalled()
+      expect(window.clearInterval).toHaveBeenCalled()
+      expect(carousel._isPaused).toEqual(true)
+    })
+
+    it('should not set is paused at true if an event is passed', () => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div class="carousel-item active">item 1</div>',
+        '    <div class="carousel-item">item 2</div>',
+        '    <div class="carousel-item">item 3</div>',
+        '  </div>',
+        '  <div class="carousel-control-prev"></div>',
+        '  <div class="carousel-control-next"></div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('#myCarousel')
+      const carousel = new Carousel(carouselEl)
+      const event = createEvent('mouseenter')
+
+      spyOn(window, 'clearInterval')
+
+      carousel.pause(event)
+
+      expect(window.clearInterval).toHaveBeenCalled()
+      expect(carousel._isPaused).toEqual(false)
+    })
+  })
+
+  describe('cycle', () => {
+    it('should set an interval', () => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div class="carousel-item active">item 1</div>',
+        '    <div class="carousel-item">item 2</div>',
+        '    <div class="carousel-item">item 3</div>',
+        '  </div>',
+        '  <div class="carousel-control-prev"></div>',
+        '  <div class="carousel-control-next"></div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('#myCarousel')
+      const carousel = new Carousel(carouselEl)
+
+      spyOn(window, 'setInterval').and.callThrough()
+
+      carousel.cycle()
+
+      expect(window.setInterval).toHaveBeenCalled()
+    })
+
+    it('should not set interval if the carousel is paused', () => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div class="carousel-item active">item 1</div>',
+        '    <div class="carousel-item">item 2</div>',
+        '    <div class="carousel-item">item 3</div>',
+        '  </div>',
+        '  <div class="carousel-control-prev"></div>',
+        '  <div class="carousel-control-next"></div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('#myCarousel')
+      const carousel = new Carousel(carouselEl)
+
+      spyOn(window, 'setInterval').and.callThrough()
+
+      carousel._isPaused = true
+      carousel.cycle(true)
+
+      expect(window.setInterval).not.toHaveBeenCalled()
+    })
+
+    it('should clear interval if there is one', () => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div class="carousel-item active">item 1</div>',
+        '    <div class="carousel-item">item 2</div>',
+        '    <div class="carousel-item">item 3</div>',
+        '  </div>',
+        '  <div class="carousel-control-prev"></div>',
+        '  <div class="carousel-control-next"></div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('#myCarousel')
+      const carousel = new Carousel(carouselEl)
+
+      carousel._interval = setInterval(() => {}, 10)
+
+      spyOn(window, 'setInterval').and.callThrough()
+      spyOn(window, 'clearInterval').and.callThrough()
+
+      carousel.cycle()
+
+      expect(window.setInterval).toHaveBeenCalled()
+      expect(window.clearInterval).toHaveBeenCalled()
+    })
+  })
+
+  describe('to', () => {
+    it('should go directement to the provided index', done => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div id="item1" class="carousel-item active">item 1</div>',
+        '    <div class="carousel-item">item 2</div>',
+        '    <div id="item3" class="carousel-item">item 3</div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('#myCarousel')
+      const carousel = new Carousel(carouselEl, {})
+
+      expect(fixtureEl.querySelector('.active')).toEqual(fixtureEl.querySelector('#item1'))
+
+      carousel.to(2)
+
+      carouselEl.addEventListener('slid.bs.carousel', () => {
+        expect(fixtureEl.querySelector('.active')).toEqual(fixtureEl.querySelector('#item3'))
+        done()
+      })
+    })
+
+    it('should return to a previous slide if the provided index is lower than the current', done => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div class="carousel-item">item 1</div>',
+        '    <div id="item2" class="carousel-item">item 2</div>',
+        '    <div id="item3" class="carousel-item active">item 3</div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('#myCarousel')
+      const carousel = new Carousel(carouselEl, {})
+
+      expect(fixtureEl.querySelector('.active')).toEqual(fixtureEl.querySelector('#item3'))
+
+      carousel.to(1)
+
+      carouselEl.addEventListener('slid.bs.carousel', () => {
+        expect(fixtureEl.querySelector('.active')).toEqual(fixtureEl.querySelector('#item2'))
+        done()
+      })
+    })
+
+    it('should do nothing if a wrong index is provided', () => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div class="carousel-item active">item 1</div>',
+        '    <div class="carousel-item" data-interval="7">item 2</div>',
+        '    <div class="carousel-item">item 3</div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('#myCarousel')
+      const carousel = new Carousel(carouselEl, {})
+
+      const spy = spyOn(carousel, '_slide')
+
+      carousel.to(25)
+
+      expect(spy).not.toHaveBeenCalled()
+
+      spy.calls.reset()
+
+      carousel.to(-5)
+
+      expect(spy).not.toHaveBeenCalled()
+    })
+
+    it('should call pause and cycle is the provided is the same compare to the current one', () => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div class="carousel-item active">item 1</div>',
+        '    <div class="carousel-item" data-interval="7">item 2</div>',
+        '    <div class="carousel-item">item 3</div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('#myCarousel')
+      const carousel = new Carousel(carouselEl, {})
+
+      spyOn(carousel, '_slide')
+      spyOn(carousel, 'pause')
+      spyOn(carousel, 'cycle')
+
+      carousel.to(0)
+
+      expect(carousel._slide).not.toHaveBeenCalled()
+      expect(carousel.pause).toHaveBeenCalled()
+      expect(carousel.cycle).toHaveBeenCalled()
+    })
+
+    it('should wait before performing to if a slide is sliding', done => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div class="carousel-item active">item 1</div>',
+        '    <div class="carousel-item" data-interval="7">item 2</div>',
+        '    <div class="carousel-item">item 3</div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('#myCarousel')
+      const carousel = new Carousel(carouselEl, {})
+
+      spyOn(EventHandler, 'one').and.callThrough()
+      spyOn(carousel, '_slide')
+
+      carousel._isSliding = true
+      carousel.to(1)
+
+      expect(carousel._slide).not.toHaveBeenCalled()
+      expect(EventHandler.one).toHaveBeenCalled()
+
+      spyOn(carousel, 'to')
+
+      EventHandler.trigger(carouselEl, 'slid.bs.carousel')
+
+      setTimeout(() => {
+        expect(carousel.to).toHaveBeenCalledWith(1)
+        done()
+      })
+    })
+  })
+
+  describe('dispose', () => {
+    it('should destroy a carousel', () => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div class="carousel-item active">item 1</div>',
+        '    <div class="carousel-item" data-interval="7">item 2</div>',
+        '    <div class="carousel-item">item 3</div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const carouselEl = fixtureEl.querySelector('#myCarousel')
+      const carousel = new Carousel(carouselEl)
+
+      spyOn(EventHandler, 'off').and.callThrough()
+
+      carousel.dispose()
+
+      expect(EventHandler.off).toHaveBeenCalled()
+    })
+  })
+
+  describe('_jQueryInterface', () => {
+    it('should create a carousel', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+
+      jQueryMock.fn.carousel = Carousel._jQueryInterface
+      jQueryMock.elements = [div]
+
+      jQueryMock.fn.carousel.call(jQueryMock)
+
+      expect(Carousel._getInstance(div)).toBeDefined()
+    })
+
+    it('should not re create a carousel', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+      const carousel = new Carousel(div)
+
+      jQueryMock.fn.carousel = Carousel._jQueryInterface
+      jQueryMock.elements = [div]
+
+      jQueryMock.fn.carousel.call(jQueryMock)
+
+      expect(Carousel._getInstance(div)).toEqual(carousel)
+    })
+
+    it('should call to if the config is a number', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+      const carousel = new Carousel(div)
+      const slideTo = 2
+
+      spyOn(carousel, 'to')
+
+      jQueryMock.fn.carousel = Carousel._jQueryInterface
+      jQueryMock.elements = [div]
+
+      jQueryMock.fn.carousel.call(jQueryMock, slideTo)
+
+      expect(carousel.to).toHaveBeenCalledWith(slideTo)
+    })
+
+    it('should throw error on undefined method', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+      const action = 'undefinedMethod'
+
+      jQueryMock.fn.carousel = Carousel._jQueryInterface
+      jQueryMock.elements = [div]
+
+      try {
+        jQueryMock.fn.carousel.call(jQueryMock, action)
+      } catch (error) {
+        expect(error.message).toEqual(`No method named "${action}"`)
+      }
+    })
+  })
+
+  describe('data-api', () => {
+    it('should init carousels with data-ride="carousel" on load', () => {
+      fixtureEl.innerHTML = '<div data-ride="carousel"></div>'
+
+      const carouselEl = fixtureEl.querySelector('div')
+      const loadEvent = createEvent('load')
+
+      window.dispatchEvent(loadEvent)
+
+      expect(Carousel._getInstance(carouselEl)).toBeDefined()
+    })
+
+    it('should create carousel and go to the next slide on click', done => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div class="carousel-item active">item 1</div>',
+        '    <div id="item2" class="carousel-item">item 2</div>',
+        '    <div class="carousel-item">item 3</div>',
+        '  </div>',
+        '  <div class="carousel-control-prev" data-target="#myCarousel" role="button" data-slide="prev"></div>',
+        '  <div id="next" class="carousel-control-next" data-target="#myCarousel" role="button" data-slide="next"></div>',
+        '</div>'
+      ].join('')
+
+      const next = fixtureEl.querySelector('#next')
+      const item2 = fixtureEl.querySelector('#item2')
+
+      next.click()
+
+      setTimeout(() => {
+        expect(item2.classList.contains('active')).toEqual(true)
+        done()
+      }, 10)
+    })
+
+    it('should create carousel and go to the next slide on click with data-slide-to', done => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div class="carousel-item active">item 1</div>',
+        '    <div id="item2" class="carousel-item">item 2</div>',
+        '    <div class="carousel-item">item 3</div>',
+        '  </div>',
+        '  <div id="next" data-target="#myCarousel" data-slide-to="1"></div>',
+        '</div>'
+      ].join('')
+
+      const next = fixtureEl.querySelector('#next')
+      const item2 = fixtureEl.querySelector('#item2')
+
+      next.click()
+
+      setTimeout(() => {
+        expect(item2.classList.contains('active')).toEqual(true)
+        done()
+      }, 10)
+    })
+
+    it('should do nothing if no selector on click on arrows', () => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="carousel slide">',
+        '  <div class="carousel-inner">',
+        '    <div class="carousel-item active">item 1</div>',
+        '    <div class="carousel-item">item 2</div>',
+        '    <div class="carousel-item">item 3</div>',
+        '  </div>',
+        '  <div class="carousel-control-prev" data-target="#myCarousel" role="button" data-slide="prev"></div>',
+        '  <div id="next" class="carousel-control-next" role="button" data-slide="next"></div>',
+        '</div>'
+      ].join('')
+
+      const next = fixtureEl.querySelector('#next')
+
+      next.click()
+
+      expect().nothing()
+    })
+
+    it('should do nothing if no carousel class on click on arrows', () => {
+      fixtureEl.innerHTML = [
+        '<div id="myCarousel" class="slide">',
+        '  <div class="carousel-inner">',
+        '    <div class="carousel-item active">item 1</div>',
+        '    <div id="item2" class="carousel-item">item 2</div>',
+        '    <div class="carousel-item">item 3</div>',
+        '  </div>',
+        '  <div class="carousel-control-prev" data-target="#myCarousel" role="button" data-slide="prev"></div>',
+        '  <div id="next" class="carousel-control-next" data-target="#myCarousel" role="button" data-slide="next"></div>',
+        '</div>'
+      ].join('')
+
+      const next = fixtureEl.querySelector('#next')
+
+      next.click()
+
+      expect().nothing()
+    })
+  })
+})