import Collapse from '../../src/collapse'
import EventHandler from '../../src/dom/event-handler'

/** Test helpers */
import { getFixture, clearFixture, jQueryMock } from '../helpers/fixture'

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

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

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

  describe('VERSION', () => {
    it('should return plugin version', () => {
      expect(Collapse.VERSION).toEqual(jasmine.any(String))
    })
  })

  describe('Default', () => {
    it('should return plugin default config', () => {
      expect(Collapse.Default).toEqual(jasmine.any(Object))
    })
  })

  describe('constructor', () => {
    it('should allow jquery object in parent config', () => {
      fixtureEl.innerHTML = [
        '<div class="my-collapse">',
        '  <div class="item">',
        '    <a data-toggle="collapse" href="#">Toggle item</a>',
        '    <div class="collapse">Lorem ipsum</div>',
        '  </div>',
        '</div>'
      ].join('')

      const collapseEl = fixtureEl.querySelector('div.collapse')
      const myCollapseEl = fixtureEl.querySelector('.my-collapse')
      const fakejQueryObject = {
        0: myCollapseEl
      }
      const collapse = new Collapse(collapseEl, {
        parent: fakejQueryObject
      })

      expect(collapse._config.parent).toEqual(fakejQueryObject)
      expect(collapse._getParent()).toEqual(myCollapseEl)
    })

    it('should allow non jquery object in parent config', () => {
      fixtureEl.innerHTML = [
        '<div class="my-collapse">',
        '  <div class="item">',
        '    <a data-toggle="collapse" href="#">Toggle item</a>',
        '    <div class="collapse">Lorem ipsum</div>',
        '  </div>',
        '</div>'
      ].join('')

      const collapseEl = fixtureEl.querySelector('div.collapse')
      const myCollapseEl = fixtureEl.querySelector('.my-collapse')
      const collapse = new Collapse(collapseEl, {
        parent: myCollapseEl
      })

      expect(collapse._config.parent).toEqual(myCollapseEl)
    })

    it('should allow string selector in parent config', () => {
      fixtureEl.innerHTML = [
        '<div class="my-collapse">',
        '  <div class="item">',
        '    <a data-toggle="collapse" href="#">Toggle item</a>',
        '    <div class="collapse">Lorem ipsum</div>',
        '  </div>',
        '</div>'
      ].join('')

      const collapseEl = fixtureEl.querySelector('div.collapse')
      const myCollapseEl = fixtureEl.querySelector('.my-collapse')
      const collapse = new Collapse(collapseEl, {
        parent: 'div.my-collapse'
      })

      expect(collapse._config.parent).toEqual('div.my-collapse')
      expect(collapse._getParent()).toEqual(myCollapseEl)
    })
  })

  describe('toggle', () => {
    it('should call show method if show class is not present', () => {
      fixtureEl.innerHTML = '<div></div>'

      const collapseEl = fixtureEl.querySelector('div')
      const collapse = new Collapse(collapseEl)

      spyOn(collapse, 'show')

      collapse.toggle()

      expect(collapse.show).toHaveBeenCalled()
    })

    it('should call hide method if show class is present', () => {
      fixtureEl.innerHTML = '<div class="show"></div>'

      const collapseEl = fixtureEl.querySelector('.show')
      const collapse = new Collapse(collapseEl, {
        toggle: false
      })

      spyOn(collapse, 'hide')

      collapse.toggle()

      expect(collapse.hide).toHaveBeenCalled()
    })

    it('should find collapse children if they have collapse class too not only data-parent', done => {
      fixtureEl.innerHTML = [
        '<div class="my-collapse">',
        '  <div class="item">',
        '    <a data-toggle="collapse" href="#">Toggle item 1</a>',
        '    <div id="collapse1" class="collapse show">Lorem ipsum 1</div>',
        '  </div>',
        '  <div class="item">',
        '    <a id="triggerCollapse2" data-toggle="collapse" href="#">Toggle item 2</a>',
        '    <div id="collapse2" class="collapse">Lorem ipsum 2</div>',
        '  </div>',
        '</div>'
      ].join('')

      const parent = fixtureEl.querySelector('.my-collapse')
      const collapseEl1 = fixtureEl.querySelector('#collapse1')
      const collapseEl2 = fixtureEl.querySelector('#collapse2')

      const collapseList = [].concat(...fixtureEl.querySelectorAll('.collapse'))
        .map(el => new Collapse(el, {
          parent,
          toggle: false
        }))

      collapseEl2.addEventListener('shown.bs.collapse', () => {
        expect(collapseEl2.classList.contains('show')).toEqual(true)
        expect(collapseEl1.classList.contains('show')).toEqual(false)
        done()
      })

      collapseList[1].toggle()
    })
  })

  describe('show', () => {
    it('should do nothing if is transitioning', () => {
      fixtureEl.innerHTML = '<div></div>'

      spyOn(EventHandler, 'trigger')

      const collapseEl = fixtureEl.querySelector('div')
      const collapse = new Collapse(collapseEl, {
        toggle: false
      })

      collapse._isTransitioning = true
      collapse.show()

      expect(EventHandler.trigger).not.toHaveBeenCalled()
    })

    it('should do nothing if already shown', () => {
      fixtureEl.innerHTML = '<div class="show"></div>'

      spyOn(EventHandler, 'trigger')

      const collapseEl = fixtureEl.querySelector('div')
      const collapse = new Collapse(collapseEl, {
        toggle: false
      })

      collapse.show()

      expect(EventHandler.trigger).not.toHaveBeenCalled()
    })

    it('should show a collapsed element', done => {
      fixtureEl.innerHTML = '<div class="collapse" style="height: 0px;"></div>'

      const collapseEl = fixtureEl.querySelector('div')
      const collapse = new Collapse(collapseEl, {
        toggle: false
      })

      collapseEl.addEventListener('show.bs.collapse', () => {
        expect(collapseEl.style.height).toEqual('0px')
      })
      collapseEl.addEventListener('shown.bs.collapse', () => {
        expect(collapseEl.classList.contains('show')).toEqual(true)
        expect(collapseEl.style.height).toEqual('')
        done()
      })

      collapse.show()
    })

    it('should show a collapsed element on width', done => {
      fixtureEl.innerHTML = '<div class="collapse width" style="width: 0px;"></div>'

      const collapseEl = fixtureEl.querySelector('div')
      const collapse = new Collapse(collapseEl, {
        toggle: false
      })

      collapseEl.addEventListener('show.bs.collapse', () => {
        expect(collapseEl.style.width).toEqual('0px')
      })
      collapseEl.addEventListener('shown.bs.collapse', () => {
        expect(collapseEl.classList.contains('show')).toEqual(true)
        expect(collapseEl.style.width).toEqual('')
        done()
      })

      collapse.show()
    })

    it('should collapse only the first collapse', done => {
      fixtureEl.innerHTML = [
        '<div class="card" id="accordion1">',
        '  <div id="collapse1" class="collapse"></div>',
        '</div>',
        '<div class="card" id="accordion2">',
        '  <div id="collapse2" class="collapse show"></div>',
        '</div>'
      ].join('')

      const el1 = fixtureEl.querySelector('#collapse1')
      const el2 = fixtureEl.querySelector('#collapse2')
      const collapse = new Collapse(el1, {
        toggle: false
      })

      el1.addEventListener('shown.bs.collapse', () => {
        expect(el1.classList.contains('show')).toEqual(true)
        expect(el2.classList.contains('show')).toEqual(true)
        done()
      })

      collapse.show()
    })

    it('should not fire shown when show is prevented', done => {
      fixtureEl.innerHTML = '<div class="collapse"></div>'

      const collapseEl = fixtureEl.querySelector('div')
      const collapse = new Collapse(collapseEl, {
        toggle: false
      })

      const expectEnd = () => {
        setTimeout(() => {
          expect().nothing()
          done()
        }, 10)
      }

      collapseEl.addEventListener('show.bs.collapse', e => {
        e.preventDefault()
        expectEnd()
      })

      collapseEl.addEventListener('shown.bs.collapse', () => {
        throw new Error('should not fire shown event')
      })

      collapse.show()
    })
  })

  describe('hide', () => {
    it('should do nothing if is transitioning', () => {
      fixtureEl.innerHTML = '<div></div>'

      spyOn(EventHandler, 'trigger')

      const collapseEl = fixtureEl.querySelector('div')
      const collapse = new Collapse(collapseEl, {
        toggle: false
      })

      collapse._isTransitioning = true
      collapse.hide()

      expect(EventHandler.trigger).not.toHaveBeenCalled()
    })

    it('should do nothing if already shown', () => {
      fixtureEl.innerHTML = '<div></div>'

      spyOn(EventHandler, 'trigger')

      const collapseEl = fixtureEl.querySelector('div')
      const collapse = new Collapse(collapseEl, {
        toggle: false
      })

      collapse.hide()

      expect(EventHandler.trigger).not.toHaveBeenCalled()
    })

    it('should hide a collapsed element', done => {
      fixtureEl.innerHTML = '<div class="collapse show"></div>'

      const collapseEl = fixtureEl.querySelector('div')
      const collapse = new Collapse(collapseEl, {
        toggle: false
      })

      collapseEl.addEventListener('hidden.bs.collapse', () => {
        expect(collapseEl.classList.contains('show')).toEqual(false)
        expect(collapseEl.style.height).toEqual('')
        done()
      })

      collapse.hide()
    })

    it('should not fire hidden when hide is prevented', done => {
      fixtureEl.innerHTML = '<div class="collapse show"></div>'

      const collapseEl = fixtureEl.querySelector('div')
      const collapse = new Collapse(collapseEl, {
        toggle: false
      })

      const expectEnd = () => {
        setTimeout(() => {
          expect().nothing()
          done()
        }, 10)
      }

      collapseEl.addEventListener('hide.bs.collapse', e => {
        e.preventDefault()
        expectEnd()
      })

      collapseEl.addEventListener('hidden.bs.collapse', () => {
        throw new Error('should not fire hidden event')
      })

      collapse.hide()
    })
  })

  describe('dispose', () => {
    it('should destroy a collapse', () => {
      fixtureEl.innerHTML = '<div class="collapse show"></div>'

      const collapseEl = fixtureEl.querySelector('div')
      const collapse = new Collapse(collapseEl, {
        toggle: false
      })

      expect(Collapse.getInstance(collapseEl)).toEqual(collapse)

      collapse.dispose()

      expect(Collapse.getInstance(collapseEl)).toEqual(null)
    })
  })

  describe('data-api', () => {
    it('should show multiple collapsed elements', done => {
      fixtureEl.innerHTML = [
        '<a role="button" data-toggle="collapse" class="collapsed" href=".multi"></a>',
        '<div id="collapse1" class="collapse multi"></div>',
        '<div id="collapse2" class="collapse multi"></div>'
      ].join('')

      const trigger = fixtureEl.querySelector('a')
      const collapse1 = fixtureEl.querySelector('#collapse1')
      const collapse2 = fixtureEl.querySelector('#collapse2')

      collapse2.addEventListener('shown.bs.collapse', () => {
        expect(trigger.getAttribute('aria-expanded')).toEqual('true')
        expect(trigger.classList.contains('collapsed')).toEqual(false)
        expect(collapse1.classList.contains('show')).toEqual(true)
        expect(collapse1.classList.contains('show')).toEqual(true)
        done()
      })

      trigger.click()
    })

    it('should hide multiple collapsed elements', done => {
      fixtureEl.innerHTML = [
        '<a role="button" data-toggle="collapse" href=".multi"></a>',
        '<div id="collapse1" class="collapse multi show"></div>',
        '<div id="collapse2" class="collapse multi show"></div>'
      ].join('')

      const trigger = fixtureEl.querySelector('a')
      const collapse1 = fixtureEl.querySelector('#collapse1')
      const collapse2 = fixtureEl.querySelector('#collapse2')

      collapse2.addEventListener('hidden.bs.collapse', () => {
        expect(trigger.getAttribute('aria-expanded')).toEqual('false')
        expect(trigger.classList.contains('collapsed')).toEqual(true)
        expect(collapse1.classList.contains('show')).toEqual(false)
        expect(collapse1.classList.contains('show')).toEqual(false)
        done()
      })

      trigger.click()
    })

    it('should remove "collapsed" class from target when collapse is shown', done => {
      fixtureEl.innerHTML = [
        '<a id="link1" role="button" data-toggle="collapse" class="collapsed" href="#" data-target="#test1"></a>',
        '<a id="link2" role="button" data-toggle="collapse" class="collapsed" href="#" data-target="#test1"></a>',
        '<div id="test1"></div>'
      ].join('')

      const link1 = fixtureEl.querySelector('#link1')
      const link2 = fixtureEl.querySelector('#link2')
      const collapseTest1 = fixtureEl.querySelector('#test1')

      collapseTest1.addEventListener('shown.bs.collapse', () => {
        expect(link1.getAttribute('aria-expanded')).toEqual('true')
        expect(link2.getAttribute('aria-expanded')).toEqual('true')
        expect(link1.classList.contains('collapsed')).toEqual(false)
        expect(link2.classList.contains('collapsed')).toEqual(false)
        done()
      })

      link1.click()
    })

    it('should add "collapsed" class to target when collapse is hidden', done => {
      fixtureEl.innerHTML = [
        '<a id="link1" role="button" data-toggle="collapse" href="#" data-target="#test1"></a>',
        '<a id="link2" role="button" data-toggle="collapse" href="#" data-target="#test1"></a>',
        '<div id="test1" class="show"></div>'
      ].join('')

      const link1 = fixtureEl.querySelector('#link1')
      const link2 = fixtureEl.querySelector('#link2')
      const collapseTest1 = fixtureEl.querySelector('#test1')

      collapseTest1.addEventListener('hidden.bs.collapse', () => {
        expect(link1.getAttribute('aria-expanded')).toEqual('false')
        expect(link2.getAttribute('aria-expanded')).toEqual('false')
        expect(link1.classList.contains('collapsed')).toEqual(true)
        expect(link2.classList.contains('collapsed')).toEqual(true)
        done()
      })

      link1.click()
    })

    it('should allow accordion to use children other than card', done => {
      fixtureEl.innerHTML = [
        '<div id="accordion">',
        '  <div class="item">',
        '    <a id="linkTrigger" data-toggle="collapse" href="#collapseOne" aria-expanded="false" aria-controls="collapseOne"></a>',
        '    <div id="collapseOne" class="collapse" role="tabpanel" aria-labelledby="headingThree" data-parent="#accordion"></div>',
        '  </div>',
        '  <div class="item">',
        '    <a id="linkTriggerTwo" data-toggle="collapse" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo"></a>',
        '    <div id="collapseTwo" class="collapse show" role="tabpanel" aria-labelledby="headingTwo" data-parent="#accordion"></div>',
        '  </div>',
        '</div>'
      ].join('')

      const trigger = fixtureEl.querySelector('#linkTrigger')
      const triggerTwo = fixtureEl.querySelector('#linkTriggerTwo')
      const collapseOne = fixtureEl.querySelector('#collapseOne')
      const collapseTwo = fixtureEl.querySelector('#collapseTwo')

      collapseOne.addEventListener('shown.bs.collapse', () => {
        expect(collapseOne.classList.contains('show')).toEqual(true)
        expect(collapseTwo.classList.contains('show')).toEqual(false)

        collapseTwo.addEventListener('shown.bs.collapse', () => {
          expect(collapseOne.classList.contains('show')).toEqual(false)
          expect(collapseTwo.classList.contains('show')).toEqual(true)
          done()
        })

        triggerTwo.click()
      })

      trigger.click()
    })

    it('should not prevent event for input', done => {
      fixtureEl.innerHTML = [
        '<input type="checkbox" data-toggle="collapse" data-target="#collapsediv1">',
        '<div id="collapsediv1"></div>'
      ].join('')

      const target = fixtureEl.querySelector('input')
      const collapseEl = fixtureEl.querySelector('#collapsediv1')

      collapseEl.addEventListener('shown.bs.collapse', () => {
        expect(collapseEl.classList.contains('show')).toEqual(true)
        expect(target.checked).toEqual(true)
        done()
      })

      target.click()
    })

    it('should allow accordion to contain nested elements', done => {
      fixtureEl.innerHTML = [
        '<div id="accordion">',
        '  <div class="row">',
        '    <div class="col-lg-6">',
        '      <div class="item">',
        '        <a id="linkTrigger" data-toggle="collapse" href="#collapseOne" aria-expanded="false" aria-controls="collapseOne"></a>',
        '        <div id="collapseOne" class="collapse" role="tabpanel" aria-labelledby="headingThree" data-parent="#accordion"></div>',
        '      </div>',
        '    </div>',
        '    <div class="col-lg-6">',
        '      <div class="item">',
        '        <a id="linkTriggerTwo" data-toggle="collapse" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo"></a>',
        '        <div id="collapseTwo" class="collapse show" role="tabpanel" aria-labelledby="headingTwo" data-parent="#accordion"></div>',
        '      </div>',
        '    </div>',
        '  </div>',
        '</div>'
      ].join('')

      const triggerEl = fixtureEl.querySelector('#linkTrigger')
      const triggerTwoEl = fixtureEl.querySelector('#linkTriggerTwo')
      const collapseOneEl = fixtureEl.querySelector('#collapseOne')
      const collapseTwoEl = fixtureEl.querySelector('#collapseTwo')

      collapseOneEl.addEventListener('shown.bs.collapse', () => {
        expect(collapseOneEl.classList.contains('show')).toEqual(true)
        expect(triggerEl.classList.contains('collapsed')).toEqual(false)
        expect(triggerEl.getAttribute('aria-expanded')).toEqual('true')

        expect(collapseTwoEl.classList.contains('show')).toEqual(false)
        expect(triggerTwoEl.classList.contains('collapsed')).toEqual(true)
        expect(triggerTwoEl.getAttribute('aria-expanded')).toEqual('false')

        collapseTwoEl.addEventListener('shown.bs.collapse', () => {
          expect(collapseOneEl.classList.contains('show')).toEqual(false)
          expect(triggerEl.classList.contains('collapsed')).toEqual(true)
          expect(triggerEl.getAttribute('aria-expanded')).toEqual('false')

          expect(collapseTwoEl.classList.contains('show')).toEqual(true)
          expect(triggerTwoEl.classList.contains('collapsed')).toEqual(false)
          expect(triggerTwoEl.getAttribute('aria-expanded')).toEqual('true')
          done()
        })

        triggerTwoEl.click()
      })

      triggerEl.click()
    })

    it('should allow accordion to target multiple elements', done => {
      fixtureEl.innerHTML = [
        '<div id="accordion">',
        '  <a id="linkTriggerOne" data-toggle="collapse" data-target=".collapseOne" href="#" aria-expanded="false" aria-controls="collapseOne"></a>',
        '  <a id="linkTriggerTwo" data-toggle="collapse" data-target=".collapseTwo" href="#" aria-expanded="false" aria-controls="collapseTwo"></a>',
        '  <div id="collapseOneOne" class="collapse collapseOne" role="tabpanel" data-parent="#accordion"></div>',
        '  <div id="collapseOneTwo" class="collapse collapseOne" role="tabpanel" data-parent="#accordion"></div>',
        '  <div id="collapseTwoOne" class="collapse collapseTwo" role="tabpanel" data-parent="#accordion"></div>',
        '  <div id="collapseTwoTwo" class="collapse collapseTwo" role="tabpanel" data-parent="#accordion"></div>',
        '</div>'
      ].join('')

      const trigger = fixtureEl.querySelector('#linkTriggerOne')
      const triggerTwo = fixtureEl.querySelector('#linkTriggerTwo')
      const collapseOneOne = fixtureEl.querySelector('#collapseOneOne')
      const collapseOneTwo = fixtureEl.querySelector('#collapseOneTwo')
      const collapseTwoOne = fixtureEl.querySelector('#collapseTwoOne')
      const collapseTwoTwo = fixtureEl.querySelector('#collapseTwoTwo')
      const collapsedElements = {
        one: false,
        two: false
      }

      function firstTest() {
        expect(collapseOneOne.classList.contains('show')).toEqual(true)
        expect(collapseOneTwo.classList.contains('show')).toEqual(true)

        expect(collapseTwoOne.classList.contains('show')).toEqual(false)
        expect(collapseTwoTwo.classList.contains('show')).toEqual(false)

        triggerTwo.click()
      }

      function secondTest() {
        expect(collapseOneOne.classList.contains('show')).toEqual(false)
        expect(collapseOneTwo.classList.contains('show')).toEqual(false)

        expect(collapseTwoOne.classList.contains('show')).toEqual(true)
        expect(collapseTwoTwo.classList.contains('show')).toEqual(true)
        done()
      }

      collapseOneOne.addEventListener('shown.bs.collapse', () => {
        if (collapsedElements.one) {
          firstTest()
        } else {
          collapsedElements.one = true
        }
      })

      collapseOneTwo.addEventListener('shown.bs.collapse', () => {
        if (collapsedElements.one) {
          firstTest()
        } else {
          collapsedElements.one = true
        }
      })

      collapseTwoOne.addEventListener('shown.bs.collapse', () => {
        if (collapsedElements.two) {
          secondTest()
        } else {
          collapsedElements.two = true
        }
      })

      collapseTwoTwo.addEventListener('shown.bs.collapse', () => {
        if (collapsedElements.two) {
          secondTest()
        } else {
          collapsedElements.two = true
        }
      })

      trigger.click()
    })

    it('should collapse accordion children but not nested accordion children', done => {
      fixtureEl.innerHTML = [
        '<div id="accordion">',
        '  <div class="item">',
        '    <a id="linkTrigger" data-toggle="collapse" href="#collapseOne" aria-expanded="false" aria-controls="collapseOne"></a>',
        '    <div id="collapseOne" data-parent="#accordion" class="collapse" role="tabpanel" aria-labelledby="headingThree">',
        '      <div id="nestedAccordion">',
        '        <div class="item">',
        '          <a id="nestedLinkTrigger" data-toggle="collapse" href="#nestedCollapseOne" aria-expanded="false" aria-controls="nestedCollapseOne"></a>',
        '          <div id="nestedCollapseOne" data-parent="#nestedAccordion" class="collapse" role="tabpanel" aria-labelledby="headingThree"></div>',
        '        </div>',
        '      </div>',
        '    </div>',
        '  </div>',
        '  <div class="item">',
        '    <a id="linkTriggerTwo" data-toggle="collapse" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo"></a>',
        '    <div id="collapseTwo" data-parent="#accordion" class="collapse show" role="tabpanel" aria-labelledby="headingTwo"></div>',
        '  </div>',
        '</div>'
      ].join('')

      const trigger = fixtureEl.querySelector('#linkTrigger')
      const triggerTwo = fixtureEl.querySelector('#linkTriggerTwo')
      const nestedTrigger = fixtureEl.querySelector('#nestedLinkTrigger')
      const collapseOne = fixtureEl.querySelector('#collapseOne')
      const collapseTwo = fixtureEl.querySelector('#collapseTwo')
      const nestedCollapseOne = fixtureEl.querySelector('#nestedCollapseOne')

      function handlerCollapseOne() {
        expect(collapseOne.classList.contains('show')).toEqual(true)
        expect(collapseTwo.classList.contains('show')).toEqual(false)
        expect(nestedCollapseOne.classList.contains('show')).toEqual(false)

        nestedCollapseOne.addEventListener('shown.bs.collapse', handlerNestedCollapseOne)
        nestedTrigger.click()
        collapseOne.removeEventListener('shown.bs.collapse', handlerCollapseOne)
      }

      function handlerNestedCollapseOne() {
        expect(collapseOne.classList.contains('show')).toEqual(true)
        expect(collapseTwo.classList.contains('show')).toEqual(false)
        expect(nestedCollapseOne.classList.contains('show')).toEqual(true)

        collapseTwo.addEventListener('shown.bs.collapse', () => {
          expect(collapseOne.classList.contains('show')).toEqual(false)
          expect(collapseTwo.classList.contains('show')).toEqual(true)
          expect(nestedCollapseOne.classList.contains('show')).toEqual(true)
          done()
        })

        triggerTwo.click()
        nestedCollapseOne.removeEventListener('shown.bs.collapse', handlerNestedCollapseOne)
      }

      collapseOne.addEventListener('shown.bs.collapse', handlerCollapseOne)
      trigger.click()
    })

    it('should add "collapsed" class and set aria-expanded to triggers only when all the targeted collapse are hidden', done => {
      fixtureEl.innerHTML = [
        '<a id="trigger1" role="button" data-toggle="collapse" href="#test1"></a>',
        '<a id="trigger2" role="button" data-toggle="collapse" href="#test2"></a>',
        '<a id="trigger3" role="button" data-toggle="collapse" href=".multi"></a>',
        '<div id="test1" class="multi"></div>',
        '<div id="test2" class="multi"></div>'
      ].join('')

      const trigger1 = fixtureEl.querySelector('#trigger1')
      const trigger2 = fixtureEl.querySelector('#trigger2')
      const trigger3 = fixtureEl.querySelector('#trigger3')
      const target1 = fixtureEl.querySelector('#test1')
      const target2 = fixtureEl.querySelector('#test2')

      const target2Shown = () => {
        expect(trigger1.classList.contains('collapsed')).toEqual(false)
        expect(trigger1.getAttribute('aria-expanded')).toEqual('true')

        expect(trigger2.classList.contains('collapsed')).toEqual(false)
        expect(trigger2.getAttribute('aria-expanded')).toEqual('true')

        expect(trigger3.classList.contains('collapsed')).toEqual(false)
        expect(trigger3.getAttribute('aria-expanded')).toEqual('true')

        target2.addEventListener('hidden.bs.collapse', () => {
          expect(trigger1.classList.contains('collapsed')).toEqual(false)
          expect(trigger1.getAttribute('aria-expanded')).toEqual('true')

          expect(trigger2.classList.contains('collapsed')).toEqual(true)
          expect(trigger2.getAttribute('aria-expanded')).toEqual('false')

          expect(trigger3.classList.contains('collapsed')).toEqual(false)
          expect(trigger3.getAttribute('aria-expanded')).toEqual('true')

          target1.addEventListener('hidden.bs.collapse', () => {
            expect(trigger1.classList.contains('collapsed')).toEqual(true)
            expect(trigger1.getAttribute('aria-expanded')).toEqual('false')

            expect(trigger2.classList.contains('collapsed')).toEqual(true)
            expect(trigger2.getAttribute('aria-expanded')).toEqual('false')

            expect(trigger3.classList.contains('collapsed')).toEqual(true)
            expect(trigger3.getAttribute('aria-expanded')).toEqual('false')
            done()
          })

          trigger1.click()
        })

        trigger2.click()
      }

      target2.addEventListener('shown.bs.collapse', target2Shown)
      trigger3.click()
    })
  })

  describe('jQueryInterface', () => {
    it('should create a collapse', () => {
      fixtureEl.innerHTML = '<div></div>'

      const div = fixtureEl.querySelector('div')

      jQueryMock.fn.collapse = Collapse.jQueryInterface
      jQueryMock.elements = [div]

      jQueryMock.fn.collapse.call(jQueryMock)

      expect(Collapse.getInstance(div)).toBeDefined()
    })

    it('should not re create a collapse', () => {
      fixtureEl.innerHTML = '<div></div>'

      const div = fixtureEl.querySelector('div')
      const collapse = new Collapse(div)

      jQueryMock.fn.collapse = Collapse.jQueryInterface
      jQueryMock.elements = [div]

      jQueryMock.fn.collapse.call(jQueryMock)

      expect(Collapse.getInstance(div)).toEqual(collapse)
    })

    it('should throw error on undefined method', () => {
      fixtureEl.innerHTML = '<div></div>'

      const div = fixtureEl.querySelector('div')
      const action = 'undefinedMethod'

      jQueryMock.fn.collapse = Collapse.jQueryInterface
      jQueryMock.elements = [div]

      try {
        jQueryMock.fn.collapse.call(jQueryMock, action)
      } catch (error) {
        expect(error.message).toEqual(`No method named "${action}"`)
      }
    })
  })

  describe('getInstance', () => {
    it('should return collapse instance', () => {
      fixtureEl.innerHTML = '<div></div>'

      const div = fixtureEl.querySelector('div')
      const collapse = new Collapse(div)

      expect(Collapse.getInstance(div)).toEqual(collapse)
    })

    it('should return null when there is no collapse instance', () => {
      fixtureEl.innerHTML = '<div></div>'

      const div = fixtureEl.querySelector('div')

      expect(Collapse.getInstance(div)).toEqual(null)
    })
  })
})