rewrite dropdown unit tests

7 files changed, 1508 insertions, 1514 deletions

diff --git a/build/build-plugins.js b/build/build-plugins.js
index d60c1f53d..c071f7f28 100644
--- a/build/build-plugins.js
+++ b/build/build-plugins.js
@@ -36,7 +36,7 @@ const bsPlugins = {
   Button: path.resolve(__dirname, '../js/src/button/button.js'),
   Carousel: path.resolve(__dirname, '../js/src/carousel/carousel.js'),
   Collapse: path.resolve(__dirname, '../js/src/collapse/collapse.js'),
-  Dropdown: path.resolve(__dirname, '../js/src/dropdown.js'),
+  Dropdown: path.resolve(__dirname, '../js/src/dropdown/dropdown.js'),
   Modal: path.resolve(__dirname, '../js/src/modal.js'),
   Popover: path.resolve(__dirname, '../js/src/popover.js'),
   ScrollSpy: path.resolve(__dirname, '../js/src/scrollspy.js'),
diff --git a/js/index.esm.js b/js/index.esm.js
index bb8b7509e..28c1ecd48 100644
--- a/js/index.esm.js
+++ b/js/index.esm.js
@@ -9,7 +9,7 @@ import Alert from './src/alert/alert'
 import Button from './src/button/button'
 import Carousel from './src/carousel/carousel'
 import Collapse from './src/collapse/collapse'
-import Dropdown from './src/dropdown'
+import Dropdown from './src/dropdown/dropdown'
 import Modal from './src/modal'
 import Popover from './src/popover'
 import ScrollSpy from './src/scrollspy'
diff --git a/js/index.umd.js b/js/index.umd.js
index 56f1a32a7..5066a7531 100644
--- a/js/index.umd.js
+++ b/js/index.umd.js
@@ -9,7 +9,7 @@ import Alert from './src/alert/alert'
 import Button from './src/button/button'
 import Carousel from './src/carousel/carousel'
 import Collapse from './src/collapse/collapse'
-import Dropdown from './src/dropdown'
+import Dropdown from './src/dropdown/dropdown'
 import Modal from './src/modal'
 import Popover from './src/popover'
 import ScrollSpy from './src/scrollspy'
diff --git a/js/src/dropdown.js b/js/src/dropdown/dropdown.js
index 729b64732..8607afe7f 100644
--- a/js/src/dropdown.js
+++ b/js/src/dropdown/dropdown.js
@@ -12,12 +12,12 @@ import {
   makeArray,
   noop,
   typeCheckConfig
-} from './util/index'
-import Data from './dom/data'
-import EventHandler from './dom/event-handler'
-import Manipulator from './dom/manipulator'
+} from '../util/index'
+import Data from '../dom/data'
+import EventHandler from '../dom/event-handler'
+import Manipulator from '../dom/manipulator'
 import Popper from 'popper.js'
-import SelectorEngine from './dom/selector-engine'
+import SelectorEngine from '../dom/selector-engine'
 
 /**
  * ------------------------------------------------------------------------
@@ -289,15 +289,9 @@ class Dropdown {
   }
 
   _getMenuElement() {
-    if (!this._menu) {
-      const parent = Dropdown._getParentFromElement(this._element)
-
-      if (parent) {
-        this._menu = SelectorEngine.findOne(Selector.MENU, parent)
-      }
-    }
+    const parent = Dropdown._getParentFromElement(this._element)
 
-    return this._menu
+    return SelectorEngine.findOne(Selector.MENU, parent)
   }
 
   _getPlacement() {
@@ -545,7 +539,7 @@ EventHandler
  * ------------------------------------------------------------------------
  * add .dropdown to jQuery only if jQuery is present
  */
-
+/* istanbul ignore if */
 if (typeof $ !== 'undefined') {
   const JQUERY_NO_CONFLICT = $.fn[NAME]
   $.fn[NAME] = Dropdown._jQueryInterface
diff --git a/js/src/dropdown/dropdown.spec.js b/js/src/dropdown/dropdown.spec.js
new file mode 100644
index 000000000..692b27090
--- /dev/null
+++ b/js/src/dropdown/dropdown.spec.js
@@ -0,0 +1,1494 @@
+import Popper from 'popper.js'
+
+import Dropdown from './dropdown'
+import EventHandler from '../dom/event-handler'
+
+/** Test helpers */
+import { getFixture, clearFixture, createEvent, jQueryMock } from '../../tests/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 href="#" 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 href="#" 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 href="#" 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()
+    })
+  })
+
+  describe('toggle', () => {
+    it('should toggle a dropdown', done => {
+      fixtureEl.innerHTML = [
+        '<div class="dropdown">',
+        '  <button href="#" 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(dropdownEl.classList.contains('show')).toEqual(true)
+        expect(btnDropdown.getAttribute('aria-expanded')).toEqual('true')
+        done()
+      })
+
+      dropdown.toggle()
+    })
+
+    it('should toggle a dropdown and add/remove event listener on mobile', done => {
+      fixtureEl.innerHTML = [
+        '<div class="dropdown">',
+        '  <button href="#" 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(dropdownEl.classList.contains('show')).toEqual(true)
+        expect(btnDropdown.getAttribute('aria-expanded')).toEqual('true')
+        expect(EventHandler.on).toHaveBeenCalled()
+
+        dropdown.toggle()
+      })
+
+      dropdownEl.addEventListener('hidden.bs.dropdown', () => {
+        expect(dropdownEl.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 href="#" 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(dropdownEl.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 href="#" 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(dropupEl.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 href="#" 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(dropupEl.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 href="#" 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(droprightEl.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 href="#" 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(dropleftEl.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 href="#" 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(dropdownEl.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 href="#" 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(dropdownEl.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 href="#" 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(dropdownEl.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 href="#" 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 href="#" 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 href="#" 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 href="#" 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 href="#" 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(dropdownEl.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 href="#" 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 href="#" 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 href="#" 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 href="#" 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 href="#" 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 not hide a dropdown if the element is disabled', done => {
+      fixtureEl.innerHTML = [
+        '<div class="dropdown">',
+        '  <button disabled href="#" 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 href="#" 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 href="#" 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 href="#" 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 href="#" 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 href="#" 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 href="#" 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 href="#" 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 href="#" 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 href="#" 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 href="#" 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(dropdownEl.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(dropdownEl.classList.contains('show')).toEqual(false)
+        expect(btnDropdown.getAttribute('aria-expanded')).toEqual('false')
+        expect(hideEventTriggered).toEqual(true)
+        expect(e.relatedTarget).toEqual(btnDropdown)
+        done()
+      })
+
+      btnDropdown.click()
+    })
+
+    it('should not use popper.js in navbar', done => {
+      fixtureEl.innerHTML = [
+        '<nav class="navbar navbar-expand-md navbar-light bg-light">',
+        '  <div class="dropdown">',
+        '    <button href="#" 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>',
+        '</nav>'
+      ].join('')
+
+      const btnDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
+      const dropdownEl = fixtureEl.querySelector('.dropdown')
+      const dropdownMenu = fixtureEl.querySelector('.dropdown-menu')
+
+      dropdownEl.addEventListener('shown.bs.dropdown', () => {
+        expect(dropdownMenu.getAttribute('style')).toEqual(null, 'no inline style applied by popper.js')
+        done()
+      })
+
+      btnDropdown.click()
+    })
+
+    it('should not use popper.js if display set to static', done => {
+      fixtureEl.innerHTML = [
+        '<div class="dropdown">',
+        '  <button href="#" class="btn dropdown-toggle" data-toggle="dropdown" data-display="static">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 dropdownMenu = fixtureEl.querySelector('.dropdown-menu')
+
+      dropdownEl.addEventListener('shown.bs.dropdown', () => {
+        // popper.js add this attribute when we use it
+        expect(dropdownMenu.getAttribute('x-placement')).toEqual(null)
+        done()
+      })
+
+      btnDropdown.click()
+    })
+
+    it('should remove "show" class if tabbing outside of menu', done => {
+      fixtureEl.innerHTML = [
+        '<div class="dropdown">',
+        '  <button href="#" 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('show')).toEqual(true)
+
+        const keyUp = createEvent('keyup')
+
+        keyUp.which = 9 // Tab
+        document.dispatchEvent(keyUp)
+      })
+
+      dropdownEl.addEventListener('hidden.bs.dropdown', () => {
+        expect(dropdownEl.classList.contains('show')).toEqual(false)
+        done()
+      })
+
+      btnDropdown.click()
+    })
+
+    it('should remove "show" class if body is clicked, with multiple dropdowns', done => {
+      fixtureEl.innerHTML = [
+        '<div class="nav">',
+        '  <div class="dropdown" id="testmenu">',
+        '    <a class="dropdown-toggle" data-toggle="dropdown" href="#testmenu">Test menu <span class="caret"/></a>',
+        '    <div class="dropdown-menu">',
+        '      <a class="dropdown-item" href="#sub1">Submenu 1</a>',
+        '    </div>',
+        '  </div>',
+        '</div>',
+        '<div class="btn-group">',
+        '  <button class="btn">Actions</button>',
+        '  <button class="btn dropdown-toggle" data-toggle="dropdown"></button>',
+        '  <div class="dropdown-menu">',
+        '    <a class="dropdown-item" href="#">Action 1</a>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const triggerDropdownList = fixtureEl.querySelectorAll('[data-toggle="dropdown"]')
+
+      expect(triggerDropdownList.length).toEqual(2)
+
+      const first = triggerDropdownList[0]
+      const last = triggerDropdownList[1]
+      const dropdownTestMenu = first.parentNode
+      const btnGroup = last.parentNode
+
+      dropdownTestMenu.addEventListener('shown.bs.dropdown', () => {
+        expect(dropdownTestMenu.classList.contains('show')).toEqual(true)
+        expect(fixtureEl.querySelectorAll('.dropdown-menu.show').length).toEqual(1)
+        document.body.click()
+      })
+
+      dropdownTestMenu.addEventListener('hidden.bs.dropdown', () => {
+        expect(fixtureEl.querySelectorAll('.dropdown-menu.show').length).toEqual(0)
+        last.click()
+      })
+
+      btnGroup.addEventListener('shown.bs.dropdown', () => {
+        expect(btnGroup.classList.contains('show')).toEqual(true)
+        expect(fixtureEl.querySelectorAll('.dropdown-menu.show').length).toEqual(1)
+        document.body.click()
+      })
+
+      btnGroup.addEventListener('hidden.bs.dropdown', () => {
+        expect(fixtureEl.querySelectorAll('.dropdown-menu.show').length).toEqual(0)
+        done()
+      })
+
+      first.click()
+    })
+
+    it('should remove "show" class if body if tabbing outside of menu, with multiple dropdowns', done => {
+      fixtureEl.innerHTML = [
+        '<div class="dropdown">',
+        '  <a class="dropdown-toggle" data-toggle="dropdown" href="#testmenu">Test menu</a>',
+        '  <div class="dropdown-menu">',
+        '    <a class="dropdown-item" href="#sub1">Submenu 1</a>',
+        '  </div>',
+        '</div>',
+        '<div class="btn-group">',
+        '  <button class="btn">Actions</button>',
+        '  <button class="btn dropdown-toggle" data-toggle="dropdown"></button>',
+        '  <div class="dropdown-menu">',
+        '    <a class="dropdown-item" href="#">Action 1</a>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const triggerDropdownList = fixtureEl.querySelectorAll('[data-toggle="dropdown"]')
+
+      expect(triggerDropdownList.length).toEqual(2)
+
+      const first = triggerDropdownList[0]
+      const last = triggerDropdownList[1]
+      const dropdownTestMenu = first.parentNode
+      const btnGroup = last.parentNode
+
+      dropdownTestMenu.addEventListener('shown.bs.dropdown', () => {
+        expect(dropdownTestMenu.classList.contains('show')).toEqual(true, '"show" class added on click')
+        expect(fixtureEl.querySelectorAll('.dropdown-menu.show').length).toEqual(1, 'only one dropdown is shown')
+
+        const keyUp = createEvent('keyup')
+        keyUp.which = 9 // Tab
+
+        document.dispatchEvent(keyUp)
+      })
+
+      dropdownTestMenu.addEventListener('hidden.bs.dropdown', () => {
+        expect(fixtureEl.querySelectorAll('.dropdown-menu.show').length).toEqual(0, '"show" class removed')
+        last.click()
+      })
+
+      btnGroup.addEventListener('shown.bs.dropdown', () => {
+        expect(btnGroup.classList.contains('show')).toEqual(true, '"show" class added on click')
+        expect(fixtureEl.querySelectorAll('.dropdown-menu.show').length).toEqual(1, 'only one dropdown is shown')
+
+        const keyUp = createEvent('keyup')
+        keyUp.which = 9 // Tab
+
+        document.dispatchEvent(keyUp)
+      })
+
+      btnGroup.addEventListener('hidden.bs.dropdown', () => {
+        expect(fixtureEl.querySelectorAll('.dropdown-menu.show').length).toEqual(0, '"show" class removed')
+        done()
+      })
+
+      first.click()
+    })
+
+    it('should fire hide and hidden event without a clickEvent if event type is not click', done => {
+      fixtureEl.innerHTML = [
+        '<div class="dropdown">',
+        '  <button href="#" class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
+        '  <div class="dropdown-menu">',
+        '    <a class="dropdown-item" href="#sub1">Submenu 1</a>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const triggerDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
+      const dropdown = fixtureEl.querySelector('.dropdown')
+
+      dropdown.addEventListener('hide.bs.dropdown', e => {
+        expect(e.clickEvent).toBeUndefined()
+      })
+
+      dropdown.addEventListener('hidden.bs.dropdown', e => {
+        expect(e.clickEvent).toBeUndefined()
+        done()
+      })
+
+      dropdown.addEventListener('shown.bs.dropdown', () => {
+        const keyDown = createEvent('keydown')
+
+        keyDown.which = 27
+        triggerDropdown.dispatchEvent(keyDown)
+      })
+
+      triggerDropdown.click()
+    })
+
+    it('should ignore keyboard events within <input>s and <textarea>s', done => {
+      fixtureEl.innerHTML = [
+        '<div class="dropdown">',
+        '  <button href="#" class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
+        '  <div class="dropdown-menu">',
+        '    <a class="dropdown-item" href="#sub1">Submenu 1</a>',
+        '    <input type="text" />',
+        '    <textarea></textarea>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      // the element must be displayed, without that activeElement won't change
+      fixtureEl.style.display = 'block'
+
+      const triggerDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
+      const dropdown = fixtureEl.querySelector('.dropdown')
+      const input = fixtureEl.querySelector('input')
+      const textarea = fixtureEl.querySelector('textarea')
+
+      dropdown.addEventListener('shown.bs.dropdown', () => {
+        input.focus()
+        const keyDown = createEvent('keydown')
+
+        keyDown.which = 38
+        input.dispatchEvent(keyDown)
+
+        expect(document.activeElement).toEqual(input, 'input still focused')
+
+        textarea.focus()
+        textarea.dispatchEvent(keyDown)
+
+        expect(document.activeElement).toEqual(textarea, 'textarea still focused')
+        fixtureEl.style.display = 'none'
+        done()
+      })
+
+      triggerDropdown.click()
+    })
+
+    it('should skip disabled element when using keyboard navigation', done => {
+      fixtureEl.innerHTML = [
+        '<div class="dropdown">',
+        '  <button href="#" class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
+        '  <div class="dropdown-menu">',
+        '    <a class="dropdown-item disabled" href="#sub1">Submenu 1</a>',
+        '    <button class="dropdown-item" type="button" disabled>Disabled button</button>',
+        '    <a id="item1" class="dropdown-item" href="#">Another link</a>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const triggerDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
+      const dropdown = fixtureEl.querySelector('.dropdown')
+
+      // the element must be displayed, without that activeElement won't change
+      fixtureEl.style.display = 'block'
+
+      dropdown.addEventListener('shown.bs.dropdown', () => {
+        const keyDown = createEvent('keydown')
+        keyDown.which = 40
+
+        triggerDropdown.dispatchEvent(keyDown)
+        triggerDropdown.dispatchEvent(keyDown)
+
+        expect(document.activeElement.classList.contains('disabled')).toEqual(false, '.disabled not focused')
+        expect(document.activeElement.hasAttribute('disabled')).toEqual(false, ':disabled not focused')
+        fixtureEl.style.display = 'none'
+        done()
+      })
+
+      triggerDropdown.click()
+    })
+
+    it('should focus next/previous element when using keyboard navigation', done => {
+      fixtureEl.innerHTML = [
+        '<div class="dropdown">',
+        '  <button href="#" class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
+        '  <div class="dropdown-menu">',
+        '    <a id="item1" class="dropdown-item" href="#">A link</a>',
+        '    <a id="item2" class="dropdown-item" href="#">Another link</a>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const triggerDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
+      const dropdown = fixtureEl.querySelector('.dropdown')
+      const item1 = fixtureEl.querySelector('#item1')
+      const item2 = fixtureEl.querySelector('#item2')
+
+      // the element must be displayed, without that activeElement won't change
+      fixtureEl.style.display = 'block'
+
+      dropdown.addEventListener('shown.bs.dropdown', () => {
+        const keyDown40 = createEvent('keydown')
+        keyDown40.which = 40
+
+        triggerDropdown.dispatchEvent(keyDown40)
+        expect(document.activeElement).toEqual(item1, 'item1 is focused')
+
+        document.activeElement.dispatchEvent(keyDown40)
+        expect(document.activeElement).toEqual(item2, 'item2 is focused')
+
+        const keyDown38 = createEvent('keydown')
+        keyDown38.which = 38
+
+        document.activeElement.dispatchEvent(keyDown38)
+        expect(document.activeElement).toEqual(item1, 'item1 is focused')
+
+        fixtureEl.style.display = 'none'
+        done()
+      })
+
+      triggerDropdown.click()
+    })
+
+    it('should not close the dropdown if the user clicks on a text field', done => {
+      fixtureEl.innerHTML = [
+        '<div class="dropdown">',
+        '  <button href="#" class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
+        '  <div class="dropdown-menu">',
+        '    <input type="text" />',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const triggerDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
+      const dropdown = fixtureEl.querySelector('.dropdown')
+      const input = fixtureEl.querySelector('input')
+
+      input.addEventListener('click', () => {
+        expect(dropdown.classList.contains('show')).toEqual(true, 'dropdown menu is shown')
+        done()
+      })
+
+      dropdown.addEventListener('shown.bs.dropdown', () => {
+        expect(dropdown.classList.contains('show')).toEqual(true, 'dropdown menu is shown')
+        input.dispatchEvent(createEvent('click'))
+      })
+
+      triggerDropdown.click()
+    })
+
+    it('should not close the dropdown if the user clicks on a textarea', done => {
+      fixtureEl.innerHTML = [
+        '<div class="dropdown">',
+        '  <button href="#" class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
+        '  <div class="dropdown-menu">',
+        '    <textarea></textarea>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const triggerDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
+      const dropdown = fixtureEl.querySelector('.dropdown')
+      const textarea = fixtureEl.querySelector('textarea')
+
+      textarea.addEventListener('click', () => {
+        expect(dropdown.classList.contains('show')).toEqual(true, 'dropdown menu is shown')
+        done()
+      })
+
+      dropdown.addEventListener('shown.bs.dropdown', () => {
+        expect(dropdown.classList.contains('show')).toEqual(true, 'dropdown menu is shown')
+        textarea.dispatchEvent(createEvent('click'))
+      })
+
+      triggerDropdown.click()
+    })
+
+    it('should ignore keyboard events for <input>s and <textarea>s within dropdown-menu, except for escape key', done => {
+      fixtureEl.innerHTML = [
+        '<div class="dropdown">',
+        '  <button href="#" class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
+        '  <div class="dropdown-menu">',
+        '    <a class="dropdown-item" href="#sub1">Submenu 1</a>',
+        '    <input type="text" />',
+        '    <textarea></textarea>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      // the element must be displayed, without that activeElement won't change
+      fixtureEl.style.display = 'block'
+
+      const triggerDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
+      const dropdown = fixtureEl.querySelector('.dropdown')
+      const input = fixtureEl.querySelector('input')
+      const textarea = fixtureEl.querySelector('textarea')
+
+      // Space key
+      const keyDownSpace = createEvent('keydown')
+      keyDownSpace.which = 32
+
+      // Key up
+      const keyDownUp = createEvent('keydown')
+      keyDownSpace.which = 38
+
+      // Key down
+      const keyDown = createEvent('keydown')
+      keyDownSpace.which = 40
+
+      // Key escape
+      const keyDownEscape = createEvent('keydown')
+      keyDownEscape.which = 27
+
+      dropdown.addEventListener('shown.bs.dropdown', () => {
+        // Space key
+        input.focus()
+        input.dispatchEvent(keyDownSpace)
+
+        expect(document.activeElement).toEqual(input, 'input still focused')
+
+        textarea.focus()
+        textarea.dispatchEvent(keyDownSpace)
+
+        expect(document.activeElement).toEqual(textarea, 'textarea still focused')
+
+        // Key up
+        input.focus()
+        input.dispatchEvent(keyDownUp)
+
+        expect(document.activeElement).toEqual(input, 'input still focused')
+
+        textarea.focus()
+        textarea.dispatchEvent(keyDownUp)
+
+        expect(document.activeElement).toEqual(textarea, 'textarea still focused')
+
+        // Key down
+        input.focus()
+        input.dispatchEvent(keyDown)
+
+        expect(document.activeElement).toEqual(input, 'input still focused')
+
+        textarea.focus()
+        textarea.dispatchEvent(keyDown)
+
+        expect(document.activeElement).toEqual(textarea, 'textarea still focused')
+
+        // Key escape
+        input.focus()
+        input.dispatchEvent(keyDownEscape)
+
+        expect(dropdown.classList.contains('show')).toEqual(false, 'dropdown menu is not shown')
+        fixtureEl.style.display = 'none'
+        done()
+      })
+
+      triggerDropdown.click()
+    })
+
+    it('should not open dropdown if escape key was pressed on the toggle', done => {
+      fixtureEl.innerHTML = [
+        '<div class="tabs">',
+        '  <div class="dropdown">',
+        '    <button disabled href="#" class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>',
+        '    <div class="dropdown-menu">',
+        '      <a class="dropdown-item" href="#">Secondary link</a>',
+        '      <a class="dropdown-item" href="#">Something else here</a>',
+        '      <div class="divider"/>',
+        '     <a class="dropdown-item" href="#">Another link</a>',
+        '   </div>',
+        '  </div>',
+        '</div>'
+      ]
+
+      const triggerDropdown = fixtureEl.querySelector('[data-toggle="dropdown"]')
+      const dropdown = new Dropdown(triggerDropdown)
+      const button = fixtureEl.querySelector('button[data-toggle="dropdown"]')
+
+      spyOn(dropdown, 'toggle')
+
+      // Key escape
+      button.focus()
+      // Key escape
+      const keyDownEscape = createEvent('keydown')
+      keyDownEscape.which = 27
+      button.dispatchEvent(keyDownEscape)
+
+      setTimeout(() => {
+        expect(dropdown.toggle).not.toHaveBeenCalled()
+        expect(triggerDropdown.parentNode.classList.contains('show')).toEqual(false)
+        done()
+      }, 20)
+    })
+  })
+
+  describe('_jQueryInterface', () => {
+    it('should create a dropdown', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+
+      jQueryMock.fn.dropdown = Dropdown._jQueryInterface
+      jQueryMock.elements = [div]
+
+      jQueryMock.fn.dropdown.call(jQueryMock)
+
+      expect(Dropdown._getInstance(div)).toBeDefined()
+    })
+
+    it('should not re create a dropdown', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+      const dropdown = new Dropdown(div)
+
+      jQueryMock.fn.dropdown = Dropdown._jQueryInterface
+      jQueryMock.elements = [div]
+
+      jQueryMock.fn.dropdown.call(jQueryMock)
+
+      expect(Dropdown._getInstance(div)).toEqual(dropdown)
+    })
+
+    it('should throw error on undefined method', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+      const action = 'undefinedMethod'
+
+      jQueryMock.fn.dropdown = Dropdown._jQueryInterface
+      jQueryMock.elements = [div]
+
+      try {
+        jQueryMock.fn.dropdown.call(jQueryMock, action)
+      } catch (error) {
+        expect(error.message).toEqual(`No method named "${action}"`)
+      }
+    })
+  })
+
+  describe('_getInstance', () => {
+    it('should return dropdown instance', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+      const dropdown = new Dropdown(div)
+
+      expect(Dropdown._getInstance(div)).toEqual(dropdown)
+    })
+
+    it('should return null when there is no dropdown instance', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+
+      expect(Dropdown._getInstance(div)).toEqual(null)
+    })
+  })
+})
diff --git a/js/tests/karma.conf.js b/js/tests/karma.conf.js
index 00bf5d8d3..5d4b6ed1d 100644
--- a/js/tests/karma.conf.js
+++ b/js/tests/karma.conf.js
@@ -9,6 +9,7 @@ const {
 } = require('./browsers')
 const babel = require('rollup-plugin-babel')
 const istanbul = require('rollup-plugin-istanbul')
+const resolve = require('rollup-plugin-node-resolve')
 
 const { env } = process
 const browserStack = env.BROWSER === 'true'
@@ -65,7 +66,8 @@ const rollupPreprocessor = {
       plugins: [
         '@babel/plugin-proposal-object-rest-spread'
       ]
-    })
+    }),
+    resolve()
   ],
   output: {
     format: 'iife',
diff --git a/js/tests/unit/dropdown.js b/js/tests/unit/dropdown.js
deleted file mode 100644
index f4327959b..000000000
--- a/js/tests/unit/dropdown.js
+++ /dev/null
@@ -1,1496 +0,0 @@
-$(function () {
-  'use strict'
-
-  var Dropdown = typeof window.bootstrap === 'undefined' ? window.Dropdown : window.bootstrap.Dropdown
-
-  QUnit.module('dropdowns plugin')
-
-  QUnit.test('should be defined on jquery object', function (assert) {
-    assert.expect(1)
-    assert.ok($(document.body).dropdown, 'dropdown method is defined')
-  })
-
-  QUnit.module('dropdowns', {
-    beforeEach: function () {
-      // Run all tests in noConflict mode -- it's the only way to ensure that the plugin works in noConflict mode
-      $.fn.bootstrapDropdown = $.fn.dropdown.noConflict()
-    },
-    afterEach: function () {
-      $.fn.dropdown = $.fn.bootstrapDropdown
-      delete $.fn.bootstrapDropdown
-      $('#qunit-fixture').html('')
-    }
-  })
-
-  QUnit.test('should provide no conflict', function (assert) {
-    assert.expect(1)
-    assert.strictEqual(typeof $.fn.dropdown, 'undefined', 'dropdown was set back to undefined (org value)')
-  })
-
-  QUnit.test('should throw explicit error on undefined method', function (assert) {
-    assert.expect(1)
-    var $el = $('<div/>')
-    $el.appendTo('#qunit-fixture')
-    $el.bootstrapDropdown()
-    try {
-      $el.bootstrapDropdown('noMethod')
-    } catch (error) {
-      assert.strictEqual(error.message, 'No method named "noMethod"')
-    }
-  })
-
-  QUnit.test('should return jquery collection containing the element', function (assert) {
-    assert.expect(2)
-    var $el = $('<div/>')
-    $el.appendTo('#qunit-fixture')
-    var $dropdown = $el.bootstrapDropdown()
-    assert.ok($dropdown instanceof $, 'returns jquery collection')
-    assert.strictEqual($dropdown[0], $el[0], 'collection contains element')
-  })
-
-  QUnit.test('should not open dropdown if target is disabled via attribute', function (assert) {
-    assert.expect(1)
-    var done = assert.async()
-    var dropdownHTML = '<div class="tabs">' +
-        '<div class="dropdown">' +
-        '<button disabled href="#" class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item" href="#">Secondary link</a>' +
-        '<a class="dropdown-item" href="#">Something else here</a>' +
-        '<div class="divider"/>' +
-        '<a class="dropdown-item" href="#">Another link</a>' +
-        '</div>' +
-        '</div>' +
-        '</div>'
-    $(dropdownHTML).appendTo('#qunit-fixture')
-    var $dropdown = $('#qunit-fixture').find('[data-toggle="dropdown"]').bootstrapDropdown()
-    $dropdown.on('click', function () {
-      assert.ok(!$dropdown.parent('.dropdown').hasClass('show'))
-      done()
-    })
-    $dropdown.trigger($.Event('click'))
-  })
-
-  QUnit.test('should not open dropdown if escape key was pressed on the toggle', function (assert) {
-    assert.expect(1)
-    var done = assert.async()
-    var dropdownHTML = '<div class="tabs">' +
-        '<div class="dropdown">' +
-        '<button disabled href="#" class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item" href="#">Secondary link</a>' +
-        '<a class="dropdown-item" href="#">Something else here</a>' +
-        '<div class="divider"/>' +
-        '<a class="dropdown-item" href="#">Another link</a>' +
-        '</div>' +
-        '</div>' +
-        '</div>'
-    $(dropdownHTML).appendTo('#qunit-fixture')
-    var $dropdown = $('#qunit-fixture').find('[data-toggle="dropdown"]').bootstrapDropdown()
-    var $button = $('button[data-toggle="dropdown"]')
-    $button[0].focus()
-    // Key escape
-    var keydown = new Event('keydown')
-    keydown.which = 27
-    $button[0].dispatchEvent(keydown)
-    assert.ok(!$dropdown.parent('.dropdown').hasClass('show'), 'dropdown menu is not shown after escape pressed')
-    done()
-  })
-
-  QUnit.test('should not add class position-static to dropdown if boundary not set', function (assert) {
-    assert.expect(1)
-    var done = assert.async()
-    var dropdownHTML = '<div class="tabs">' +
-        '<div class="dropdown">' +
-        '<a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item" href="#">Secondary link</a>' +
-        '<a class="dropdown-item" href="#">Something else here</a>' +
-        '</div>' +
-        '</div>' +
-        '</div>'
-    var $dropdown = $(dropdownHTML).find('[data-toggle="dropdown"]').bootstrapDropdown()
-    $dropdown
-      .parent('.dropdown')
-      .on('shown.bs.dropdown', function () {
-        assert.ok(!$dropdown.parent('.dropdown').hasClass('position-static'), '"position-static" class not added')
-        done()
-      })
-    $dropdown[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should add class position-static to dropdown if boundary not scrollParent', function (assert) {
-    assert.expect(1)
-    var done = assert.async()
-    var dropdownHTML = '<div class="tabs">' +
-        '<div class="dropdown">' +
-        '<a href="#" class="dropdown-toggle" data-toggle="dropdown" data-boundary="viewport">Dropdown</a>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item" href="#">Secondary link</a>' +
-        '<a class="dropdown-item" href="#">Something else here</a>' +
-        '</div>' +
-        '</div>' +
-        '</div>'
-    var $dropdown = $(dropdownHTML).find('[data-toggle="dropdown"]').bootstrapDropdown()
-    $dropdown
-      .parent('.dropdown')
-      .on('shown.bs.dropdown', function () {
-        assert.ok($dropdown.parent('.dropdown').hasClass('position-static'), '"position-static" class added')
-        done()
-      })
-    $dropdown[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should set aria-expanded="true" on target when dropdown menu is shown', function (assert) {
-    assert.expect(1)
-    var done = assert.async()
-    var dropdownHTML = '<div class="tabs">' +
-        '<div class="dropdown">' +
-        '<a href="#" class="dropdown-toggle" data-toggle="dropdown" aria-expanded="false">Dropdown</a>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item" href="#">Secondary link</a>' +
-        '<a class="dropdown-item" href="#">Something else here</a>' +
-        '<div class="divider"/>' +
-        '<a class="dropdown-item" href="#">Another link</a>' +
-        '</div>' +
-        '</div>' +
-        '</div>'
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    var dropdownParent = $dropdown.parent('.dropdown')[0]
-
-    dropdownParent.addEventListener('shown.bs.dropdown', function () {
-      assert.strictEqual($dropdown.attr('aria-expanded'), 'true', 'aria-expanded is set to string "true" on click')
-      done()
-    })
-    $dropdown[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should set aria-expanded="false" on target when dropdown menu is hidden', function (assert) {
-    assert.expect(1)
-    var done = assert.async()
-    var dropdownHTML = '<div class="tabs">' +
-        '<div class="dropdown">' +
-        '<a href="#" class="dropdown-toggle" aria-expanded="false" data-toggle="dropdown">Dropdown</a>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item" href="#">Secondary link</a>' +
-        '<a class="dropdown-item" href="#">Something else here</a>' +
-        '<div class="divider"/>' +
-        '<a class="dropdown-item" href="#">Another link</a>' +
-        '</div>' +
-        '</div>' +
-        '</div>'
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    var dropdownParent = $dropdown.parent('.dropdown')[0]
-
-    dropdownParent.addEventListener('hidden.bs.dropdown', function () {
-      assert.strictEqual($dropdown.attr('aria-expanded'), 'false', 'aria-expanded is set to string "false" on hide')
-      done()
-    })
-
-    $dropdown[0].dispatchEvent(new Event('click'))
-    document.body.click()
-  })
-
-  QUnit.test('should not open dropdown if target is disabled via class', function (assert) {
-    assert.expect(1)
-    var done = assert.async()
-    var dropdownHTML = '<div class="tabs">' +
-        '<div class="dropdown">' +
-        '<button href="#" class="btn dropdown-toggle disabled" data-toggle="dropdown">Dropdown</button>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item" href="#">Secondary link</a>' +
-        '<a class="dropdown-item" href="#">Something else here</a>' +
-        '<div class="divider"/>' +
-        '<a class="dropdown-item" href="#">Another link</a>' +
-        '</div>' +
-        '</div>' +
-        '</div>'
-
-    $(dropdownHTML).appendTo('#qunit-fixture')
-    var $dropdown = $('#qunit-fixture').find('[data-toggle="dropdown"]').bootstrapDropdown()
-    $dropdown.on('click', function () {
-      assert.ok(!$dropdown.parent('.dropdown').hasClass('show'))
-      done()
-    })
-    $dropdown.trigger($.Event('click'))
-  })
-
-  QUnit.test('should add class show to menu if clicked', function (assert) {
-    assert.expect(1)
-    var done = assert.async()
-    var dropdownHTML = '<div class="tabs">' +
-        '<div class="dropdown">' +
-        '  <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-        '  <div class="dropdown-menu">' +
-        '    <a class="dropdown-item" href="#">Secondary link</a>' +
-        '    <a class="dropdown-item" href="#">Something else here</a>' +
-        '    <div class="divider"/>' +
-        '      <a class="dropdown-item" href="#">Another link</a>' +
-        '    </div>' +
-        '  </div>' +
-        '</div>'
-
-    $(dropdownHTML).appendTo('#qunit-fixture')
-    var $dropdown = $('#qunit-fixture').find('[data-toggle="dropdown"]').bootstrapDropdown()
-
-    $dropdown
-      .parent('.dropdown')
-      .on('shown.bs.dropdown', function () {
-        assert.ok($dropdown.parent('.dropdown').hasClass('show'), '"show" class added on click')
-        done()
-      })
-    $dropdown[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should remove "show" class if body is clicked', function (assert) {
-    assert.expect(2)
-    var done = assert.async()
-    var dropdownHTML = '<div class="tabs">' +
-        '<div class="dropdown">' +
-        '<a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item" href="#">Secondary link</a>' +
-        '<a class="dropdown-item" href="#">Something else here</a>' +
-        '<div class="divider"/>' +
-        '<a class="dropdown-item" href="#">Another link</a>' +
-        '</div>' +
-        '</div>' +
-        '</div>'
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    $dropdown
-      .parent('.dropdown')
-      .on('shown.bs.dropdown', function () {
-        assert.ok($dropdown.parent('.dropdown').hasClass('show'), '"show" class added on click')
-        $(document.body).trigger('click')
-      }).on('hidden.bs.dropdown', function () {
-        assert.ok(!$dropdown.parent('.dropdown').hasClass('show'), '"show" class removed')
-        done()
-      })
-
-    $dropdown[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should remove "show" class if tabbing outside of menu', function (assert) {
-    assert.expect(2)
-    var done = assert.async()
-    var dropdownHTML = '<div class="tabs">' +
-        '<div class="dropdown">' +
-        '<a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item" href="#">Secondary link</a>' +
-        '<a class="dropdown-item" href="#">Something else here</a>' +
-        '<div class="dropdown-divider"/>' +
-        '<a class="dropdown-item" href="#">Another link</a>' +
-        '</div>' +
-        '</div>' +
-        '</div>'
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-    $dropdown
-      .parent('.dropdown')
-      .on('shown.bs.dropdown', function () {
-        assert.ok($dropdown.parent('.dropdown').hasClass('show'), '"show" class added on click')
-
-        var keyup9 = new Event('keyup')
-        keyup9.which = 9 // Tab
-        document.dispatchEvent(keyup9)
-      })
-      .on('hidden.bs.dropdown', function () {
-        assert.ok(!$dropdown.parent('.dropdown').hasClass('show'), '"show" class removed')
-        done()
-      })
-
-    $dropdown[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should remove "show" class if body is clicked, with multiple dropdowns', function (assert) {
-    assert.expect(7)
-    var done = assert.async()
-    var dropdownHTML = '<div class="nav">' +
-        '<div class="dropdown" id="testmenu">' +
-        '<a class="dropdown-toggle" data-toggle="dropdown" href="#testmenu">Test menu <span class="caret"/></a>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item" href="#sub1">Submenu 1</a>' +
-        '</div>' +
-        '</div>' +
-        '</div>' +
-        '<div class="btn-group">' +
-        '<button class="btn">Actions</button>' +
-        '<button class="btn dropdown-toggle" data-toggle="dropdown"></button>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item" href="#">Action 1</a>' +
-        '</div>' +
-        '</div>'
-    var $dropdowns = $(dropdownHTML).appendTo('#qunit-fixture').find('[data-toggle="dropdown"]')
-    var $first = $dropdowns.first()
-    var $last = $dropdowns.last()
-
-    assert.strictEqual($dropdowns.length, 2, 'two dropdowns')
-
-    $first.parent('.dropdown')
-      .on('shown.bs.dropdown', function () {
-        assert.strictEqual($first.parents('.show').length, 1, '"show" class added on click')
-        assert.strictEqual($('#qunit-fixture .dropdown-menu.show').length, 1, 'only one dropdown is shown')
-        $(document.body).trigger('click')
-      }).on('hidden.bs.dropdown', function () {
-        assert.strictEqual($('#qunit-fixture .dropdown-menu.show').length, 0, '"show" class removed')
-        $last[0].dispatchEvent(new Event('click'))
-      })
-
-    $last.parent('.btn-group')
-      .on('shown.bs.dropdown', function () {
-        assert.strictEqual($last.parent('.show').length, 1, '"show" class added on click')
-        assert.strictEqual($('#qunit-fixture .dropdown-menu.show').length, 1, 'only one dropdown is shown')
-        $(document.body).trigger('click')
-      }).on('hidden.bs.dropdown', function () {
-        assert.strictEqual($('#qunit-fixture .dropdown-menu.show').length, 0, '"show" class removed')
-        done()
-      })
-    $first[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should remove "show" class if body if tabbing outside of menu, with multiple dropdowns', function (assert) {
-    assert.expect(7)
-    var done = assert.async()
-    var dropdownHTML = '<div class="nav">' +
-        '<div class="dropdown" id="testmenu">' +
-        '<a class="dropdown-toggle" data-toggle="dropdown" href="#testmenu">Test menu <span class="caret"/></a>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item" href="#sub1">Submenu 1</a>' +
-        '</div>' +
-        '</div>' +
-        '</div>' +
-        '<div class="btn-group">' +
-        '<button class="btn">Actions</button>' +
-        '<button class="btn dropdown-toggle" data-toggle="dropdown"><span class="caret"/></button>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item" href="#">Action 1</a>' +
-        '</div>' +
-        '</div>'
-    var $dropdowns = $(dropdownHTML).appendTo('#qunit-fixture').find('[data-toggle="dropdown"]')
-    var $first = $dropdowns.first()
-    var $last = $dropdowns.last()
-
-    assert.strictEqual($dropdowns.length, 2, 'two dropdowns')
-
-    $first.parent('.dropdown')
-      .on('shown.bs.dropdown', function () {
-        assert.strictEqual($first.parents('.show').length, 1, '"show" class added on click')
-        assert.strictEqual($('#qunit-fixture .dropdown-menu.show').length, 1, 'only one dropdown is shown')
-        var keyup = new Event('keyup')
-        keyup.which = 9 // Tab
-        document.dispatchEvent(keyup)
-      }).on('hidden.bs.dropdown', function () {
-        assert.strictEqual($('#qunit-fixture .dropdown-menu.show').length, 0, '"show" class removed')
-        $last[0].dispatchEvent(new Event('click'))
-      })
-
-    $last.parent('.btn-group')
-      .on('shown.bs.dropdown', function () {
-        assert.strictEqual($last.parent('.show').length, 1, '"show" class added on click')
-        assert.strictEqual($('#qunit-fixture .dropdown-menu.show').length, 1, 'only one dropdown is shown')
-        var keyup = new Event('keyup')
-        keyup.which = 9 // Tab
-        document.dispatchEvent(keyup)
-      }).on('hidden.bs.dropdown', function () {
-        assert.strictEqual($('#qunit-fixture .dropdown-menu.show').length, 0, '"show" class removed')
-        done()
-      })
-    $first[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should fire show and hide event', function (assert) {
-    assert.expect(2)
-    var dropdownHTML = '<div class="tabs">' +
-        '<div class="dropdown">' +
-        '<a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item" href="#">Secondary link</a>' +
-        '<a class="dropdown-item" href="#">Something else here</a>' +
-        '<div class="divider"/>' +
-        '<a class="dropdown-item" href="#">Another link</a>' +
-        '</div>' +
-        '</div>' +
-        '</div>'
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    var done = assert.async()
-
-    $dropdown
-      .parent('.dropdown')
-      .on('show.bs.dropdown', function () {
-        assert.ok(true, 'show was fired')
-      })
-      .on('hide.bs.dropdown', function () {
-        assert.ok(true, 'hide was fired')
-        done()
-      })
-
-    $dropdown[0].dispatchEvent(new Event('click'))
-    document.body.click()
-  })
-
-  QUnit.test('should fire shown and hidden event', function (assert) {
-    assert.expect(2)
-    var dropdownHTML = '<div class="tabs">' +
-        '<div class="dropdown">' +
-        '<a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item" href="#">Secondary link</a>' +
-        '<a class="dropdown-item" href="#">Something else here</a>' +
-        '<div class="divider"/>' +
-        '<a class="dropdown-item" href="#">Another link</a>' +
-        '</div>' +
-        '</div>' +
-        '</div>'
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    var done = assert.async()
-
-    $dropdown
-      .parent('.dropdown')
-      .on('shown.bs.dropdown', function () {
-        assert.ok(true, 'shown was fired')
-      })
-      .on('hidden.bs.dropdown', function () {
-        assert.ok(true, 'hidden was fired')
-        done()
-      })
-
-    $dropdown[0].dispatchEvent(new Event('click'))
-    document.body.click()
-  })
-
-  QUnit.test('should fire shown and hidden event with a relatedTarget', function (assert) {
-    assert.expect(2)
-    var dropdownHTML = '<div class="tabs">' +
-        '<div class="dropdown">' +
-        '<a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item" href="#">Secondary link</a>' +
-        '<a class="dropdown-item" href="#">Something else here</a>' +
-        '<div class="divider"/>' +
-        '<a class="dropdown-item" href="#">Another link</a>' +
-        '</div>' +
-        '</div>' +
-        '</div>'
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-    var done = assert.async()
-
-    $dropdown.parent('.dropdown')
-      .on('hidden.bs.dropdown', function (e) {
-        assert.strictEqual(e.relatedTarget, $dropdown[0])
-        done()
-      })
-      .on('shown.bs.dropdown', function (e) {
-        assert.strictEqual(e.relatedTarget, $dropdown[0])
-        $(document.body).trigger('click')
-      })
-
-    $dropdown[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should fire hide and hidden event with a clickEvent', function (assert) {
-    assert.expect(3)
-    var dropdownHTML = '<div class="tabs">' +
-        '<div class="dropdown">' +
-        '<a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item" href="#">Secondary link</a>' +
-        '<a class="dropdown-item" href="#">Something else here</a>' +
-        '<div class="divider"/>' +
-        '<a class="dropdown-item" href="#">Another link</a>' +
-        '</div>' +
-        '</div>' +
-        '</div>'
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    $dropdown.parent('.dropdown')
-      .on('hide.bs.dropdown', function (e) {
-        assert.ok(e.clickEvent)
-      })
-      .on('hidden.bs.dropdown', function (e) {
-        assert.ok(e.clickEvent)
-      })
-      .on('shown.bs.dropdown', function () {
-        assert.ok(true, 'shown was fired')
-        $(document.body).trigger('click')
-      })
-
-    $dropdown[0].click()
-  })
-
-  QUnit.test('should fire hide and hidden event without a clickEvent if event type is not click', function (assert) {
-    assert.expect(3)
-    var dropdownHTML = '<div class="tabs">' +
-        '<div class="dropdown">' +
-        '<a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item" href="#">Secondary link</a>' +
-        '<a class="dropdown-item" href="#">Something else here</a>' +
-        '<div class="divider"/>' +
-        '<a class="dropdown-item" href="#">Another link</a>' +
-        '</div>' +
-        '</div>' +
-        '</div>'
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    $dropdown.parent('.dropdown')
-      .on('hide.bs.dropdown', function (e) {
-        assert.notOk(e.clickEvent)
-      })
-      .on('hidden.bs.dropdown', function (e) {
-        assert.notOk(e.clickEvent)
-      })
-      .on('shown.bs.dropdown', function () {
-        assert.ok(true, 'shown was fired')
-
-        var keyDown = new Event('keydown')
-        keyDown.which = 27
-        $dropdown[0].dispatchEvent(keyDown)
-      })
-
-    $dropdown[0].click()
-  })
-
-  QUnit.test('should ignore keyboard events within <input>s and <textarea>s', function (assert) {
-    assert.expect(3)
-    var done = assert.async()
-
-    var dropdownHTML = '<div class="tabs">' +
-        '<div class="dropdown">' +
-        '<a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item" href="#">Secondary link</a>' +
-        '<a class="dropdown-item" href="#">Something else here</a>' +
-        '<div class="divider"/>' +
-        '<a class="dropdown-item" href="#">Another link</a>' +
-        '<input type="text" id="input">' +
-        '<textarea id="textarea"/>' +
-        '</div>' +
-        '</div>' +
-        '</div>'
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    var $input = $('#input')
-    var $textarea = $('#textarea')
-
-    $dropdown
-      .parent('.dropdown')
-      .on('shown.bs.dropdown', function () {
-        assert.ok(true, 'shown was fired')
-
-        $input.trigger('focus').trigger($.Event('keydown', {
-          which: 38
-        }))
-        assert.ok($(document.activeElement).is($input), 'input still focused')
-
-        $textarea.trigger('focus').trigger($.Event('keydown', {
-          which: 38
-        }))
-        assert.ok($(document.activeElement).is($textarea), 'textarea still focused')
-
-        done()
-      })
-
-    $dropdown[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should skip disabled element when using keyboard navigation', function (assert) {
-    assert.expect(3)
-    var done = assert.async()
-    var dropdownHTML = '<div class="tabs">' +
-        '<div class="dropdown">' +
-        '<a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item disabled" href="#">Disabled link</a>' +
-        '<button class="dropdown-item" type="button" disabled>Disabled button</button>' +
-        '<a id="item1" class="dropdown-item" href="#">Another link</a>' +
-        '</div>' +
-        '</div>' +
-        '</div>'
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    $dropdown
-      .parent('.dropdown')
-      .on('shown.bs.dropdown', function () {
-        assert.ok(true, 'shown was fired')
-        $dropdown.trigger($.Event('keydown', {
-          which: 40
-        }))
-        $dropdown.trigger($.Event('keydown', {
-          which: 40
-        }))
-        assert.ok(!$(document.activeElement).is('.disabled'), '.disabled is not focused')
-        assert.ok(!$(document.activeElement).is(':disabled'), ':disabled is not focused')
-        done()
-      })
-    $dropdown[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should focus next/previous element when using keyboard navigation', function (assert) {
-    assert.expect(4)
-    var done = assert.async()
-    var dropdownHTML = '<div class="tabs">' +
-        '<div class="dropdown">' +
-        '<a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-        '<div class="dropdown-menu">' +
-        '<a id="item1" class="dropdown-item" href="#">A link</a>' +
-        '<a id="item2" class="dropdown-item" href="#">Another link</a>' +
-        '</div>' +
-        '</div>' +
-        '</div>'
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    $dropdown
-      .parent('.dropdown')
-      .on('shown.bs.dropdown', function () {
-        assert.ok(true, 'shown was fired')
-
-        var keydown40 = new Event('keydown')
-        keydown40.which = 40
-        $dropdown[0].dispatchEvent(keydown40)
-        assert.ok($(document.activeElement).is($('#item1')), 'item1 is focused')
-
-        keydown40 = new Event('keydown')
-        keydown40.which = 40
-        document.activeElement.dispatchEvent(keydown40)
-        assert.ok($(document.activeElement).is($('#item2')), 'item2 is focused')
-
-        var keydown38 = new Event('keydown')
-        keydown38.which = 38
-        document.activeElement.dispatchEvent(keydown38)
-        assert.ok($(document.activeElement).is($('#item1')), 'item1 is focused')
-        done()
-      })
-    $dropdown[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should not close the dropdown if the user clicks on a text field', function (assert) {
-    assert.expect(2)
-    var done = assert.async()
-    var dropdownHTML = '<div class="dropdown">' +
-        '<button type="button" data-toggle="dropdown">Dropdown</button>' +
-        '<div class="dropdown-menu">' +
-        '<input id="textField" type="text" />' +
-        '</div>' +
-        '</div>'
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    var $textfield = $('#textField')
-    $textfield.on('click', function () {
-      assert.ok($dropdown.parent('.dropdown').hasClass('show'), 'dropdown menu is shown')
-      done()
-    })
-
-    $dropdown
-      .parent('.dropdown')
-      .on('shown.bs.dropdown', function () {
-        assert.ok($dropdown.parent('.dropdown').hasClass('show'), 'dropdown menu is shown')
-        $textfield[0].dispatchEvent(new Event('click'))
-      })
-    $dropdown[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should not close the dropdown if the user clicks on a textarea', function (assert) {
-    assert.expect(2)
-    var done = assert.async()
-    var dropdownHTML = '<div class="dropdown">' +
-        '<button type="button" data-toggle="dropdown">Dropdown</button>' +
-        '<div class="dropdown-menu">' +
-        '<textarea id="textArea"></textarea>' +
-        '</div>' +
-        '</div>'
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    var $textarea = $('#textArea')
-    $textarea.on('click', function () {
-      assert.ok($dropdown.parent('.dropdown').hasClass('show'), 'dropdown menu is shown')
-      done()
-    })
-
-    $dropdown
-      .parent('.dropdown')
-      .on('shown.bs.dropdown', function () {
-        assert.ok($dropdown.parent('.dropdown').hasClass('show'), 'dropdown menu is shown')
-        $textarea[0].dispatchEvent(new Event('click'))
-      })
-    $dropdown[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('Dropdown should not use Popper.js in navbar', function (assert) {
-    assert.expect(1)
-    var done = assert.async()
-    var html = '<nav class="navbar navbar-expand-md navbar-light bg-light">' +
-        '<div class="dropdown">' +
-        '  <a class="nav-link dropdown-toggle" href="#" id="dropdown" data-toggle="dropdown" aria-expanded="false">Dropdown</a>' +
-        '  <div class="dropdown-menu" aria-labelledby="dropdown">' +
-        '    <a class="dropdown-item" href="#">Action</a>' +
-        '    <a class="dropdown-item" href="#">Another action</a>' +
-        '    <a class="dropdown-item" href="#">Something else here</a>' +
-        '  </div>' +
-        '</div>' +
-        '</nav>'
-
-    $(html).appendTo('#qunit-fixture')
-    var $triggerDropdown = $('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-    var $dropdownMenu = $triggerDropdown.next()
-
-    $triggerDropdown
-      .parent('.dropdown')
-      .on('shown.bs.dropdown', function () {
-        assert.ok(typeof $dropdownMenu.attr('style') === 'undefined', 'No inline style applied by Popper.js')
-        done()
-      })
-    $triggerDropdown[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should close dropdown and set focus back to toggle when escape is pressed while focused on a dropdown item', function (assert) {
-    assert.expect(3)
-    var done = assert.async()
-
-    var dropdownHTML = '<div class="tabs">' +
-        '<div class="dropdown">' +
-        '<a href="#" class="dropdown-toggle" id="toggle" data-toggle="dropdown">Dropdown</a>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item" id="item" href="#">Menu item</a>' +
-        '</div>' +
-        '</div>'
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    var $item = $('#item')
-    var $toggle = $('#toggle')
-
-    $dropdown
-      .parent('.dropdown')
-      .on('shown.bs.dropdown', function () {
-        // Forcibly focus first item
-        $item.focus()
-        assert.ok($(document.activeElement)[0] === $item[0], 'menu item initial focus set')
-
-        // Key escape
-        var keydown = new Event('keydown')
-        keydown.which = 27
-        $item[0].dispatchEvent(keydown)
-
-        assert.ok(!$dropdown.parent('.dropdown').hasClass('show'), 'dropdown menu was closed after escape')
-        assert.ok($(document.activeElement)[0] === $toggle[0], 'toggle has focus again once menu was closed after escape')
-        done()
-      })
-
-    $dropdown[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should ignore keyboard events for <input>s and <textarea>s within dropdown-menu, except for escape key', function (assert) {
-    assert.expect(7)
-    var done = assert.async()
-
-    var dropdownHTML = '<div class="tabs">' +
-        '<div class="dropdown">' +
-        '<a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item" href="#">Secondary link</a>' +
-        '<a class="dropdown-item" href="#">Something else here</a>' +
-        '<div class="divider"/>' +
-        '<a class="dropdown-item" href="#">Another link</a>' +
-        '<input type="text" id="input">' +
-        '<textarea id="textarea"/>' +
-        '</div>' +
-        '</div>' +
-        '</div>'
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    var $input = $('#input')
-    var $textarea = $('#textarea')
-
-    $dropdown
-      .parent('.dropdown')
-      .on('shown.bs.dropdown', function () {
-        // Space key
-        $input.trigger('focus').trigger($.Event('keydown', {
-          which: 32
-        }))
-        assert.ok($(document.activeElement)[0] === $input[0], 'input still focused')
-        $textarea.trigger('focus').trigger($.Event('keydown', {
-          which: 32
-        }))
-        assert.ok($(document.activeElement)[0] === $textarea[0], 'textarea still focused')
-
-        // Key up
-        $input.trigger('focus').trigger($.Event('keydown', {
-          which: 38
-        }))
-        assert.ok($(document.activeElement)[0] === $input[0], 'input still focused')
-        $textarea.trigger('focus').trigger($.Event('keydown', {
-          which: 38
-        }))
-        assert.ok($(document.activeElement)[0] === $textarea[0], 'textarea still focused')
-
-        // Key down
-        $input.trigger('focus').trigger($.Event('keydown', {
-          which: 40
-        }))
-        assert.ok($(document.activeElement)[0] === $input[0], 'input still focused')
-        $textarea.trigger('focus').trigger($.Event('keydown', {
-          which: 40
-        }))
-        assert.ok($(document.activeElement)[0] === $textarea[0], 'textarea still focused')
-
-        // Key escape
-        $input.trigger('focus')
-        var keydown = new Event('keydown')
-        keydown.which = 27
-        $input[0].dispatchEvent(keydown)
-
-        assert.ok(!$dropdown.parent('.dropdown').hasClass('show'), 'dropdown menu is not shown')
-        done()
-      })
-
-    $dropdown[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should ignore space key events for <input>s within dropdown, and accept up, down and escape', function (assert) {
-    assert.expect(7)
-    var done = assert.async()
-
-    var dropdownHTML =
-        '<ul class="nav tabs">' +
-        '  <li class="dropdown">' +
-        '    <input type="text" id="input" data-toggle="dropdown">' +
-        '    <div class="dropdown-menu" role="menu">' +
-        '      <a id="item1" class="dropdown-item" href="#">Secondary link</a>' +
-        '      <a id="item2" class="dropdown-item" href="#">Something else here</a>' +
-        '      <div class="divider"></div>' +
-        '      <a class="dropdown-item" href="#">Another link</a>' +
-        '    </div>' +
-        '  </li>' +
-        '</ul>'
-
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    var $input = $('#input')
-
-    $dropdown
-      .parent('.dropdown')
-      .one('shown.bs.dropdown', function () {
-        assert.ok(true, 'shown was fired')
-
-        // Key space
-        $input.trigger('focus').trigger($.Event('keydown', {
-          which: 32
-        }))
-        assert.ok($dropdown.parent('.dropdown').hasClass('show'), 'dropdown menu is shown')
-        assert.ok($(document.activeElement).is($input), 'input is still focused')
-
-        // Key escape
-        $input.trigger('focus')
-        var keydown = new Event('keydown')
-        keydown.which = 27
-        $input[0].dispatchEvent(keydown)
-        assert.ok(!$dropdown.parent('.dropdown').hasClass('show'), 'dropdown menu is not shown')
-
-        $dropdown
-          .parent('.dropdown')
-          .one('shown.bs.dropdown', function () {
-            assert.ok(true, 'shown was fired')
-
-            // Key down
-            $input.trigger('focus')
-            var keydown40 = new Event('keydown')
-            keydown40.which = 40
-            $input[0].dispatchEvent(keydown40)
-            assert.ok(document.activeElement === $('#item1')[0], 'item1 is focused')
-
-            $dropdown
-              .parent('.dropdown')
-              .one('shown.bs.dropdown', function () {
-                // Key up
-                $input.trigger('focus')
-                var keydown38 = new Event('keydown')
-                keydown38.which = 38
-                $input[0].dispatchEvent(keydown38)
-
-                assert.ok(document.activeElement === $('#item1')[0], 'item1 is focused')
-                done()
-              })
-              .bootstrapDropdown('toggle')
-
-            $input.bootstrapDropdown('toggle')
-          })
-
-        $input.bootstrapDropdown('toggle')
-      })
-
-    $input[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should ignore space key events for <textarea>s within dropdown, and accept up, down and escape', function (assert) {
-    assert.expect(7)
-    var done = assert.async()
-
-    var dropdownHTML =
-        '<ul class="nav tabs">' +
-        '  <li class="dropdown">' +
-        '    <textarea id="textarea" data-toggle="dropdown"></textarea>' +
-        '    <div class="dropdown-menu" role="menu">' +
-        '      <a id="item1" class="dropdown-item" href="#">Secondary link</a>' +
-        '      <a id="item2" class="dropdown-item" href="#">Something else here</a>' +
-        '      <div class="divider"></div>' +
-        '      <a class="dropdown-item" href="#">Another link</a>' +
-        '    </div>' +
-        '  </li>' +
-        '</ul>'
-
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    var $textarea = $('#textarea')
-
-    $dropdown
-      .parent('.dropdown')
-      .one('shown.bs.dropdown', function () {
-        assert.ok(true, 'shown was fired')
-
-        // Key space
-        $textarea.trigger('focus').trigger($.Event('keydown', {
-          which: 32
-        }))
-        assert.ok($dropdown.parent('.dropdown').hasClass('show'), 'dropdown menu is shown')
-        assert.ok($(document.activeElement).is($textarea), 'textarea is still focused')
-
-        // Key escape
-        $textarea.trigger('focus')
-        var keydown27 = new Event('keydown')
-        keydown27.which = 27
-        $textarea[0].dispatchEvent(keydown27)
-        assert.ok(!$dropdown.parent('.dropdown').hasClass('show'), 'dropdown menu is not shown')
-
-        $dropdown
-          .parent('.dropdown')
-          .one('shown.bs.dropdown', function () {
-            assert.ok(true, 'shown was fired')
-
-            // Key down
-            $textarea.trigger('focus')
-            var keydown40 = new Event('keydown')
-            keydown40.which = 40
-            $textarea[0].dispatchEvent(keydown40)
-            assert.ok(document.activeElement === $('#item1')[0], 'item1 is focused')
-
-            $dropdown
-              .parent('.dropdown')
-              .one('shown.bs.dropdown', function () {
-                // Key up
-                $textarea.trigger('focus')
-                var keydown38 = new Event('keydown')
-                keydown38.which = 38
-                $textarea[0].dispatchEvent(keydown38)
-
-                assert.ok(document.activeElement === $('#item1')[0], 'item1 is focused')
-                done()
-              })
-              .bootstrapDropdown('toggle')
-
-            $textarea.bootstrapDropdown('toggle')
-          })
-
-        $textarea.bootstrapDropdown('toggle')
-      })
-    $textarea[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should not use Popper.js if display set to static', function (assert) {
-    assert.expect(1)
-    var dropdownHTML =
-        '<div class="dropdown">' +
-        '<a href="#" class="dropdown-toggle" data-toggle="dropdown" data-display="static">Dropdown</a>' +
-        '<div class="dropdown-menu">' +
-        '<a class="dropdown-item" href="#">Secondary link</a>' +
-        '<a class="dropdown-item" href="#">Something else here</a>' +
-        '<div class="divider"/>' +
-        '<a class="dropdown-item" href="#">Another link</a>' +
-        '</div>' +
-        '</div>'
-
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-    var done = assert.async()
-    var dropdownMenu = $dropdown.next()[0]
-
-    $dropdown.parent('.dropdown')
-      .on('shown.bs.dropdown', function () {
-        // Popper.js add this attribute when we use it
-        assert.strictEqual(dropdownMenu.getAttribute('x-placement'), null)
-        done()
-      })
-
-    $dropdown[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should call Popper.js and detect navbar on update', function (assert) {
-    assert.expect(3)
-
-    var dropdownHTML =
-      '<div class="dropdown">' +
-      '  <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-      '  <div class="dropdown-menu">' +
-      '    <a class="dropdown-item" href="#">Another link</a>' +
-      '  </div>' +
-      '</div>'
-
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    var dropdown = Dropdown._getInstance($dropdown[0])
-    dropdown.toggle()
-    assert.ok(dropdown._popper)
-
-    var spyPopper = sinon.spy(dropdown._popper, 'scheduleUpdate')
-    var spyDetectNavbar = sinon.spy(dropdown, '_detectNavbar')
-    dropdown.update()
-
-    assert.ok(spyPopper.called)
-    assert.ok(spyDetectNavbar.called)
-  })
-
-  QUnit.test('should just detect navbar on update', function (assert) {
-    assert.expect(2)
-
-    var dropdownHTML =
-      '<div class="dropdown">' +
-      '  <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-      '  <div class="dropdown-menu">' +
-      '    <a class="dropdown-item" href="#">Another link</a>' +
-      '  </div>' +
-      '</div>'
-
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    var dropdown = Dropdown._getInstance($dropdown[0])
-    var spyDetectNavbar = sinon.spy(dropdown, '_detectNavbar')
-
-    dropdown.update()
-
-    assert.notOk(dropdown._popper)
-    assert.ok(spyDetectNavbar.called)
-  })
-
-  QUnit.test('should dispose dropdown with Popper', function (assert) {
-    assert.expect(6)
-
-    var dropdownHTML =
-      '<div class="dropdown">' +
-      '  <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-      '  <div class="dropdown-menu">' +
-      '    <a class="dropdown-item" href="#">Another link</a>' +
-      '  </div>' +
-      '</div>'
-
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    var dropdown = Dropdown._getInstance($dropdown[0])
-    dropdown.toggle()
-
-    assert.ok(dropdown._popper)
-    assert.ok(dropdown._menu !== null)
-    assert.ok(dropdown._element !== null)
-    var spyDestroy = sinon.spy(dropdown._popper, 'destroy')
-
-    dropdown.dispose()
-
-    assert.ok(spyDestroy.called)
-    assert.ok(dropdown._menu === null)
-    assert.ok(dropdown._element === null)
-  })
-
-  QUnit.test('should dispose dropdown', function (assert) {
-    assert.expect(5)
-
-    var dropdownHTML =
-      '<div class="dropdown">' +
-      '  <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-      '  <div class="dropdown-menu">' +
-      '    <a class="dropdown-item" href="#">Another link</a>' +
-      '  </div>' +
-      '</div>'
-
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    var dropdown = Dropdown._getInstance($dropdown[0])
-
-    assert.notOk(dropdown._popper)
-    assert.ok(dropdown._menu !== null)
-    assert.ok(dropdown._element !== null)
-
-    dropdown.dispose()
-
-    assert.ok(dropdown._menu === null)
-    assert.ok(dropdown._element === null)
-  })
-
-  QUnit.test('should hide dropdown', function (assert) {
-    assert.expect(2)
-
-    var dropdownHTML =
-      '<div class="dropdown">' +
-      '  <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-      '  <div class="dropdown-menu">' +
-      '    <a class="dropdown-item" href="#">Another link</a>' +
-      '  </div>' +
-      '</div>'
-
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    var dropdown = Dropdown._getInstance($dropdown[0])
-    var done = assert.async()
-
-    $dropdown
-      .parent('.dropdown')
-      .on('shown.bs.dropdown', function () {
-        dropdown.hide()
-      })
-      .on('hide.bs.dropdown', function () {
-        assert.ok(true, 'hide was fired')
-      })
-      .on('hidden.bs.dropdown', function () {
-        assert.ok(!$dropdown.parent('.dropdown').hasClass('show'), 'dropdown menu is hidden')
-        done()
-      })
-
-    dropdown.show()
-  })
-
-  QUnit.test('should not hide dropdown', function (assert) {
-    assert.expect(1)
-
-    var dropdownHTML =
-      '<div class="dropdown">' +
-      '  <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-      '  <div class="dropdown-menu">' +
-      '    <a class="dropdown-item" href="#">Another link</a>' +
-      '  </div>' +
-      '</div>'
-
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    var dropdown = Dropdown._getInstance($dropdown[0])
-    $dropdown.trigger('click')
-    dropdown.show()
-
-    assert.ok($dropdown.parent('.dropdown').hasClass('show'), 'dropdown menu is still shown')
-  })
-
-  QUnit.test('should not show dropdown', function (assert) {
-    assert.expect(1)
-
-    var dropdownHTML =
-      '<div class="dropdown">' +
-      '  <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-      '  <div class="dropdown-menu">' +
-      '    <a class="dropdown-item" href="#">Another link</a>' +
-      '  </div>' +
-      '</div>'
-
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    var dropdown = Dropdown._getInstance($dropdown[0])
-    dropdown.hide()
-    assert.ok(!$dropdown.parent('.dropdown').hasClass('show'), 'dropdown menu is still hidden')
-  })
-
-  QUnit.test('should show dropdown', function (assert) {
-    assert.expect(2)
-
-    var dropdownHTML =
-      '<div class="dropdown">' +
-      '  <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-      '  <div class="dropdown-menu">' +
-      '    <a class="dropdown-item" href="#">Another link</a>' +
-      '  </div>' +
-      '</div>'
-
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    var dropdown = Dropdown._getInstance($dropdown[0])
-    var done = assert.async()
-
-    $dropdown
-      .parent('.dropdown')
-      .on('show.bs.dropdown', function () {
-        assert.ok(true, 'show was fired')
-      })
-      .on('shown.bs.dropdown', function () {
-        assert.ok($dropdown.parent('.dropdown').hasClass('show'), 'dropdown menu is shown')
-        done()
-      })
-
-    dropdown.show()
-  })
-
-  QUnit.test('should prevent default event on show method call', function (assert) {
-    assert.expect(1)
-
-    var dropdownHTML =
-      '<div class="dropdown">' +
-      '  <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-      '  <div class="dropdown-menu">' +
-      '    <a class="dropdown-item" href="#">Another link</a>' +
-      '  </div>' +
-      '</div>'
-
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    var dropdown = Dropdown._getInstance($dropdown[0])
-    var done = assert.async()
-
-    $dropdown
-      .parent('.dropdown')
-      .on('show.bs.dropdown', function (event) {
-        event.preventDefault()
-        done()
-      })
-
-    dropdown.show()
-    assert.ok(!$dropdown.parent('.dropdown').hasClass('show'), 'dropdown menu is hidden')
-  })
-
-  QUnit.test('should prevent default event on hide method call', function (assert) {
-    assert.expect(1)
-
-    var dropdownHTML =
-      '<div class="dropdown">' +
-      '  <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-      '  <div class="dropdown-menu">' +
-      '    <a class="dropdown-item" href="#">Another link</a>' +
-      '  </div>' +
-      '</div>'
-
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown()
-
-    var dropdown = Dropdown._getInstance($dropdown[0])
-    var done = assert.async()
-
-    $dropdown
-      .parent('.dropdown')
-      .on('shown.bs.dropdown', function () {
-        dropdown.hide()
-      })
-      .on('hide.bs.dropdown', function (event) {
-        event.preventDefault()
-        assert.ok($dropdown.parent('.dropdown').hasClass('show'), 'dropdown menu is shown')
-        done()
-      })
-
-    dropdown.show()
-  })
-
-  QUnit.test('should not open dropdown via show method if target is disabled via attribute', function (assert) {
-    assert.expect(1)
-    var dropdownHTML =
-        '<div class="dropdown">' +
-        '  <button disabled href="#" class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>' +
-        '  <div class="dropdown-menu">' +
-        '    <a class="dropdown-item" href="#">Another link</a>' +
-        '  </div>' +
-        '</div>'
-    $(dropdownHTML).appendTo('#qunit-fixture')
-    var $dropdown = $('#qunit-fixture').find('[data-toggle="dropdown"]').bootstrapDropdown()
-    $dropdown.show()
-    assert.ok(!$dropdown.parent('.dropdown').hasClass('show'))
-  })
-
-  QUnit.test('should not open dropdown via show method if target is disabled via class', function (assert) {
-    assert.expect(1)
-    var dropdownHTML =
-        '<div class="dropdown">' +
-        '  <button href="#" class="btn dropdown-toggle disabled" data-toggle="dropdown">Dropdown</button>' +
-        '  <div class="dropdown-menu">' +
-        '    <a class="dropdown-item" href="#">Another link</a>' +
-        '  </div>' +
-        '</div>'
-
-    $(dropdownHTML).appendTo('#qunit-fixture')
-    var $dropdown = $('#qunit-fixture').find('[data-toggle="dropdown"]').bootstrapDropdown()
-    $dropdown.show()
-    assert.ok(!$dropdown.parent('.dropdown').hasClass('show'))
-  })
-
-  QUnit.test('should not hide dropdown via hide method if target is disabled via attribute', function (assert) {
-    assert.expect(1)
-    var dropdownHTML =
-        '<div class="dropdown show">' +
-        '  <button disabled href="#" class="btn dropdown-toggle" data-toggle="dropdown">Dropdown</button>' +
-        '  <div class="dropdown-menu">' +
-        '    <a class="dropdown-item" href="#">Another link</a>' +
-        '  </div>' +
-        '</div>'
-    $(dropdownHTML).appendTo('#qunit-fixture')
-    var $dropdown = $('#qunit-fixture').find('[data-toggle="dropdown"]').bootstrapDropdown()
-    $dropdown.hide()
-    assert.ok($dropdown.parent('.dropdown').hasClass('show'))
-  })
-
-  QUnit.test('should not hide dropdown via hide method if target is disabled via class', function (assert) {
-    assert.expect(1)
-    var dropdownHTML =
-        '<div class="dropdown show">' +
-        '  <button href="#" class="btn dropdown-toggle disabled" data-toggle="dropdown">Dropdown</button>' +
-        '  <div class="dropdown-menu">' +
-        '    <a class="dropdown-item" href="#">Another link</a>' +
-        '  </div>' +
-        '</div>'
-
-    $(dropdownHTML).appendTo('#qunit-fixture')
-    var $dropdown = $('#qunit-fixture').find('[data-toggle="dropdown"]').bootstrapDropdown()
-    $dropdown.hide()
-    assert.ok($dropdown.parent('.dropdown').hasClass('show'))
-  })
-
-  QUnit.test('should create offset modifier correctly when offset option is a function', function (assert) {
-    assert.expect(2)
-
-    var getOffset = function (offsets) {
-      return offsets
-    }
-
-    var dropdownHTML =
-      '<div class="dropdown">' +
-      '  <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-      '  <div class="dropdown-menu">' +
-      '    <a class="dropdown-item" href="#">Another link</a>' +
-      '  </div>' +
-      '</div>'
-
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown({
-        offset: getOffset
-      })
-
-    var dropdown = Dropdown._getInstance($dropdown[0])
-    var offset = dropdown._getOffset()
-
-    assert.ok(typeof offset.offset === 'undefined')
-    assert.ok(typeof offset.fn === 'function')
-  })
-
-  QUnit.test('should create offset modifier correctly when offset option is not a function', function (assert) {
-    assert.expect(2)
-
-    var dropdownHTML =
-      '<div class="dropdown">' +
-      '  <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>' +
-      '  <div class="dropdown-menu">' +
-      '    <a class="dropdown-item" href="#">Another link</a>' +
-      '  </div>' +
-      '</div>'
-
-    var myOffset = 42
-    var $dropdown = $(dropdownHTML)
-      .appendTo('#qunit-fixture')
-      .find('[data-toggle="dropdown"]')
-      .bootstrapDropdown({
-        offset: myOffset
-      })
-
-    var dropdown = Dropdown._getInstance($dropdown[0])
-    var offset = dropdown._getOffset()
-
-    assert.strictEqual(offset.offset, myOffset)
-    assert.ok(typeof offset.fn === 'undefined')
-  })
-
-  QUnit.test('should return the version', function (assert) {
-    assert.expect(1)
-    assert.strictEqual(typeof Dropdown.VERSION, 'string')
-  })
-})