rewrite dropdown unit tests

2 files changed, 1502 insertions, 14 deletions

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)
+    })
+  })
+})