dropdown.spec.js

import Popper from 'popper.js'

import Dropdown from '../../src/dropdown'
import EventHandler from '../../src/dom/event-handler'

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

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

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

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

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

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

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

  describe('constructor', () => {
    it('should create offset modifier correctly when offset option is a function', () => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const getOffset = offsets => offsets
      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdown = new Dropdown(btnDropdown, {
        offset: getOffset
      })

      const offset = dropdown._getOffset()

      expect(offset.offset).toBeUndefined()
      expect(typeof offset.fn).toEqual('function')
    })

    it('should create offset modifier correctly when offset option is not a function', () => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const myOffset = 7
      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdown = new Dropdown(btnDropdown, {
        offset: myOffset
      })

      const offset = dropdown._getOffset()

      expect(offset.offset).toEqual(myOffset)
      expect(offset.fn).toBeUndefined()
    })

    it('should add a listener on trigger which do not have data-toggle="dropdown"', () => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('.btn')
      const dropdown = new Dropdown(btnDropdown)

      spyOn(dropdown, 'toggle')

      btnDropdown.click()

      expect(dropdown.toggle).toHaveBeenCalled()
    })

    it('should allow to pass config to popper.js with `popperConfig`', () => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdown = new Dropdown(btnDropdown, {
        popperConfig: {
          placement: 'left'
        }
      })

      const popperConfig = dropdown._getPopperConfig()

      expect(popperConfig.placement).toEqual('left')
    })
  })

  describe('toggle', () => {
    it('should toggle a dropdown', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown" aria-expanded="false">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')
      const dropdown = new Dropdown(btnDropdown)

      dropdownEl.addEventListener('shown.bs.dropdown', () => {
        expect(btnDropdown.classList.contains('show')).toEqual(true)
        expect(btnDropdown.getAttribute('aria-expanded')).toEqual('true')
        done()
      })

      dropdown.toggle()
    })

    it('should destroy old popper references on toggle', done => {
      fixtureEl.innerHTML = [
        '<div class="first dropdown">',
        '  <button class="firstBtn btn" data-toggle="dropdown" aria-expanded="false">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>',
        '<div class="second dropdown">',
        '  <button class="secondBtn btn" data-toggle="dropdown" aria-expanded="false">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown1 = fixtureEl.querySelector('.firstBtn')
      const btnDropdown2 = fixtureEl.querySelector('.secondBtn')
      const firstDropdownEl = fixtureEl.querySelector('.first')
      const secondDropdownEl = fixtureEl.querySelector('.second')
      const dropdown1 = new Dropdown(btnDropdown1)
      const dropdown2 = new Dropdown(btnDropdown2)

      firstDropdownEl.addEventListener('shown.bs.dropdown', () => {
        expect(btnDropdown1.classList.contains('show')).toEqual(true)
        spyOn(dropdown1._popper, 'destroy')
        dropdown2.toggle()
      })

      secondDropdownEl.addEventListener('shown.bs.dropdown', () => {
        expect(dropdown1._popper.destroy).toHaveBeenCalled()
        done()
      })

      dropdown1.toggle()
    })

    it('should toggle a dropdown and add/remove event listener on mobile', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown" aria-expanded="false">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const defaultValueOnTouchStart = document.documentElement.ontouchstart
      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')
      const dropdown = new Dropdown(btnDropdown)

      document.documentElement.ontouchstart = () => {}
      spyOn(EventHandler, 'on')
      spyOn(EventHandler, 'off')

      dropdownEl.addEventListener('shown.bs.dropdown', () => {
        expect(btnDropdown.classList.contains('show')).toEqual(true)
        expect(btnDropdown.getAttribute('aria-expanded')).toEqual('true')
        expect(EventHandler.on).toHaveBeenCalled()

        dropdown.toggle()
      })

      dropdownEl.addEventListener('hidden.bs.dropdown', () => {
        expect(btnDropdown.classList.contains('show')).toEqual(false)
        expect(btnDropdown.getAttribute('aria-expanded')).toEqual('false')
        expect(EventHandler.off).toHaveBeenCalled()

        document.documentElement.ontouchstart = defaultValueOnTouchStart
        done()
      })

      dropdown.toggle()
    })

    it('should toggle a dropdown at the right', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown" aria-expanded="false">Dropdown</button>',
        '  <div class="dropdown-menu dropdown-menu-right">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')
      const dropdown = new Dropdown(btnDropdown)

      dropdownEl.addEventListener('shown.bs.dropdown', () => {
        expect(btnDropdown.classList.contains('show')).toEqual(true)
        expect(btnDropdown.getAttribute('aria-expanded')).toEqual('true')
        done()
      })

      dropdown.toggle()
    })

    it('should toggle a dropup', done => {
      fixtureEl.innerHTML = [
        '<div class="dropup">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown" aria-expanded="false">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropupEl = fixtureEl.querySelector('.dropup')
      const dropdown = new Dropdown(btnDropdown)

      dropupEl.addEventListener('shown.bs.dropdown', () => {
        expect(btnDropdown.classList.contains('show')).toEqual(true)
        expect(btnDropdown.getAttribute('aria-expanded')).toEqual('true')
        done()
      })

      dropdown.toggle()
    })

    it('should toggle a dropup at the right', done => {
      fixtureEl.innerHTML = [
        '<div class="dropup">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown" aria-expanded="false">Dropdown</button>',
        '  <div class="dropdown-menu dropdown-menu-right">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropupEl = fixtureEl.querySelector('.dropup')
      const dropdown = new Dropdown(btnDropdown)

      dropupEl.addEventListener('shown.bs.dropdown', () => {
        expect(btnDropdown.classList.contains('show')).toEqual(true)
        expect(btnDropdown.getAttribute('aria-expanded')).toEqual('true')
        done()
      })

      dropdown.toggle()
    })

    it('should toggle a dropright', done => {
      fixtureEl.innerHTML = [
        '<div class="dropright">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown" aria-expanded="false">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const droprightEl = fixtureEl.querySelector('.dropright')
      const dropdown = new Dropdown(btnDropdown)

      droprightEl.addEventListener('shown.bs.dropdown', () => {
        expect(btnDropdown.classList.contains('show')).toEqual(true)
        expect(btnDropdown.getAttribute('aria-expanded')).toEqual('true')
        done()
      })

      dropdown.toggle()
    })

    it('should toggle a dropleft', done => {
      fixtureEl.innerHTML = [
        '<div class="dropleft">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown" aria-expanded="false">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropleftEl = fixtureEl.querySelector('.dropleft')
      const dropdown = new Dropdown(btnDropdown)

      dropleftEl.addEventListener('shown.bs.dropdown', () => {
        expect(btnDropdown.classList.contains('show')).toEqual(true)
        expect(btnDropdown.getAttribute('aria-expanded')).toEqual('true')
        done()
      })

      dropdown.toggle()
    })

    it('should toggle a dropdown with parent reference', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown" aria-expanded="false">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')
      const dropdown = new Dropdown(btnDropdown, {
        reference: 'parent'
      })

      dropdownEl.addEventListener('shown.bs.dropdown', () => {
        expect(btnDropdown.classList.contains('show')).toEqual(true)
        expect(btnDropdown.getAttribute('aria-expanded')).toEqual('true')
        done()
      })

      dropdown.toggle()
    })

    it('should toggle a dropdown with a dom node reference', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown" aria-expanded="false">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')
      const dropdown = new Dropdown(btnDropdown, {
        reference: fixtureEl
      })

      dropdownEl.addEventListener('shown.bs.dropdown', () => {
        expect(btnDropdown.classList.contains('show')).toEqual(true)
        expect(btnDropdown.getAttribute('aria-expanded')).toEqual('true')
        done()
      })

      dropdown.toggle()
    })

    it('should toggle a dropdown with a jquery object reference', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown" aria-expanded="false">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')
      const dropdown = new Dropdown(btnDropdown, {
        reference: { 0: fixtureEl, jquery: 'jQuery' }
      })

      dropdownEl.addEventListener('shown.bs.dropdown', () => {
        expect(btnDropdown.classList.contains('show')).toEqual(true)
        expect(btnDropdown.getAttribute('aria-expanded')).toEqual('true')
        done()
      })

      dropdown.toggle()
    })

    it('should not toggle a dropdown if the element is disabled', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button disabled class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')
      const dropdown = new Dropdown(btnDropdown)

      dropdownEl.addEventListener('shown.bs.dropdown', () => {
        throw new Error('should not throw shown.bs.dropdown event')
      })

      dropdown.toggle()

      setTimeout(() => {
        expect().nothing()
        done()
      })
    })

    it('should not toggle a dropdown if the element contains .disabled', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle disabled" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')
      const dropdown = new Dropdown(btnDropdown)

      dropdownEl.addEventListener('shown.bs.dropdown', () => {
        throw new Error('should not throw shown.bs.dropdown event')
      })

      dropdown.toggle()

      setTimeout(() => {
        expect().nothing()
        done()
      })
    })

    it('should not toggle a dropdown if the menu is shown', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu show">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')
      const dropdown = new Dropdown(btnDropdown)

      dropdownEl.addEventListener('shown.bs.dropdown', () => {
        throw new Error('should not throw shown.bs.dropdown event')
      })

      dropdown.toggle()

      setTimeout(() => {
        expect().nothing()
        done()
      })
    })

    it('should not toggle a dropdown if show event is prevented', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')
      const dropdown = new Dropdown(btnDropdown)

      dropdownEl.addEventListener('show.bs.dropdown', e => {
        e.preventDefault()
      })

      dropdownEl.addEventListener('shown.bs.dropdown', () => {
        throw new Error('should not throw shown.bs.dropdown event')
      })

      dropdown.toggle()

      setTimeout(() => {
        expect().nothing()
        done()
      })
    })
  })

  describe('show', () => {
    it('should show a dropdown', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')
      const dropdown = new Dropdown(btnDropdown)

      dropdownEl.addEventListener('shown.bs.dropdown', () => {
        expect(btnDropdown.classList.contains('show')).toEqual(true)
        done()
      })

      dropdown.show()
    })

    it('should not show a dropdown if the element is disabled', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button disabled class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')
      const dropdown = new Dropdown(btnDropdown)

      dropdownEl.addEventListener('shown.bs.dropdown', () => {
        throw new Error('should not throw shown.bs.dropdown event')
      })

      dropdown.show()

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

    it('should not show a dropdown if the element contains .disabled', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle disabled" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')
      const dropdown = new Dropdown(btnDropdown)

      dropdownEl.addEventListener('shown.bs.dropdown', () => {
        throw new Error('should not throw shown.bs.dropdown event')
      })

      dropdown.show()

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

    it('should not show a dropdown if the menu is shown', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu show">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')
      const dropdown = new Dropdown(btnDropdown)

      dropdownEl.addEventListener('shown.bs.dropdown', () => {
        throw new Error('should not throw shown.bs.dropdown event')
      })

      dropdown.show()

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

    it('should not show a dropdown if show event is prevented', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')
      const dropdown = new Dropdown(btnDropdown)

      dropdownEl.addEventListener('show.bs.dropdown', e => {
        e.preventDefault()
      })

      dropdownEl.addEventListener('shown.bs.dropdown', () => {
        throw new Error('should not throw shown.bs.dropdown event')
      })

      dropdown.show()

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

  describe('hide', () => {
    it('should hide a dropdown', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu show">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')
      const dropdownMenu = fixtureEl.querySelector('.dropdown-menu')
      const dropdown = new Dropdown(btnDropdown)

      dropdownEl.addEventListener('hidden.bs.dropdown', () => {
        expect(dropdownMenu.classList.contains('show')).toEqual(false)
        done()
      })

      dropdown.hide()
    })

    it('should hide a dropdown and destroy popper', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')
      const dropdown = new Dropdown(btnDropdown)

      dropdownEl.addEventListener('shown.bs.dropdown', () => {
        spyOn(dropdown._popper, 'destroy')
        dropdown.hide()
      })

      dropdownEl.addEventListener('hidden.bs.dropdown', () => {
        expect(dropdown._popper.destroy).toHaveBeenCalled()
        done()
      })

      dropdown.show()
    })

    it('should not hide a dropdown if the element is disabled', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button disabled class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu show">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')
      const dropdownMenu = fixtureEl.querySelector('.dropdown-menu')
      const dropdown = new Dropdown(btnDropdown)

      dropdownEl.addEventListener('hidden.bs.dropdown', () => {
        throw new Error('should not throw hidden.bs.dropdown event')
      })

      dropdown.hide()

      setTimeout(() => {
        expect(dropdownMenu.classList.contains('show')).toEqual(true)
        done()
      }, 10)
    })

    it('should not hide a dropdown if the element contains .disabled', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle disabled" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu show">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')
      const dropdownMenu = fixtureEl.querySelector('.dropdown-menu')
      const dropdown = new Dropdown(btnDropdown)

      dropdownEl.addEventListener('hidden.bs.dropdown', () => {
        throw new Error('should not throw hidden.bs.dropdown event')
      })

      dropdown.hide()

      setTimeout(() => {
        expect(dropdownMenu.classList.contains('show')).toEqual(true)
        done()
      }, 10)
    })

    it('should not hide a dropdown if the menu is not shown', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')
      const dropdown = new Dropdown(btnDropdown)

      dropdownEl.addEventListener('hidden.bs.dropdown', () => {
        throw new Error('should not throw hidden.bs.dropdown event')
      })

      dropdown.hide()

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

    it('should not hide a dropdown if hide event is prevented', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu show">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')
      const dropdownMenu = fixtureEl.querySelector('.dropdown-menu')
      const dropdown = new Dropdown(btnDropdown)

      dropdownEl.addEventListener('hide.bs.dropdown', e => {
        e.preventDefault()
      })

      dropdownEl.addEventListener('hidden.bs.dropdown', () => {
        throw new Error('should not throw hidden.bs.dropdown event')
      })

      dropdown.hide()

      setTimeout(() => {
        expect(dropdownMenu.classList.contains('show')).toEqual(true)
        done()
      })
    })
  })

  describe('dispose', () => {
    it('should dispose dropdown', () => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdown = new Dropdown(btnDropdown)

      expect(dropdown._popper).toBeNull()
      expect(dropdown._menu).toBeDefined()
      expect(dropdown._element).toBeDefined()

      dropdown.dispose()

      expect(dropdown._menu).toBeNull()
      expect(dropdown._element).toBeNull()
    })

    it('should dispose dropdown with popper.js', () => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdown = new Dropdown(btnDropdown)

      dropdown.toggle()

      expect(dropdown._popper).toBeDefined()
      expect(dropdown._menu).toBeDefined()
      expect(dropdown._element).toBeDefined()

      spyOn(Popper.prototype, 'destroy')

      dropdown.dispose()

      expect(dropdown._popper).toBeNull()
      expect(dropdown._menu).toBeNull()
      expect(dropdown._element).toBeNull()
      expect(Popper.prototype.destroy).toHaveBeenCalled()
    })
  })

  describe('update', () => {
    it('should call popper.js and detect navbar on update', () => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdown = new Dropdown(btnDropdown)

      dropdown.toggle()

      expect(dropdown._popper).toBeDefined()

      spyOn(dropdown._popper, 'scheduleUpdate')
      spyOn(dropdown, '_detectNavbar')

      dropdown.update()

      expect(dropdown._popper.scheduleUpdate).toHaveBeenCalled()
      expect(dropdown._detectNavbar).toHaveBeenCalled()
    })

    it('should just detect navbar on update', () => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdown = new Dropdown(btnDropdown)

      spyOn(dropdown, '_detectNavbar')

      dropdown.update()

      expect(dropdown._popper).toBeNull()
      expect(dropdown._detectNavbar).toHaveBeenCalled()
    })
  })

  describe('data-api', () => {
    it('should not add class position-static to dropdown if boundary not set', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')

      dropdownEl.addEventListener('shown.bs.dropdown', () => {
        expect(dropdownEl.classList.contains('position-static')).toEqual(false)
        done()
      })

      btnDropdown.click()
    })

    it('should add class position-static to dropdown if boundary not scrollParent', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown" data-boundary="viewport">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')

      dropdownEl.addEventListener('shown.bs.dropdown', () => {
        expect(dropdownEl.classList.contains('position-static')).toEqual(true)
        done()
      })

      btnDropdown.click()
    })

    it('should show and hide a dropdown', done => {
      fixtureEl.innerHTML = [
        '<div class="dropdown">',
        '  <button class="btn dropdown-toggle" data-toggle="dropdown" aria-expanded="false">Dropdown</button>',
        '  <div class="dropdown-menu">',
        '    <a class="dropdown-item" href="#">Secondary link</a>',
        '  </div>',
        '</div>'
      ].join('')

      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
      const dropdownEl = fixtureEl.querySelector('.dropdown')
      let showEventTriggered = false
      let hideEventTriggered = false

      dropdownEl.addEventListener('show.bs.dropdown', () => {
        showEventTriggered = true
      })

      dropdownEl.addEventListener('shown.bs.dropdown', e => {
        expect(btnDropdown.classList.contains('show')).toEqual(true)
        expect(btnDropdown.getAttribute('aria-expanded')).toEqual('true')
        expect(showEventTriggered).toEqual(true)
        expect(e.relatedTarget).toEqual(btnDropdown)
        document.body.click()
      })

      dropdownEl.addEventListener('hide.bs.dropdown', () => {
        hideEventTriggered = true
      })

      dropdownEl.addEventListener('hidden.bs.dropdown', e => {
        expect(btnDropdown.classList.contains('show')).toEqual(false)
        expect(btnDropdown.getAttribute('aria-expanded')).toEqual('false')
        expect(hideEventTriggered).toEqual(true)