diff --git a/build/build-plugins.js b/build/build-plugins.js
index f380d77dc1..d60c1f53d4 100644
--- a/build/build-plugins.js
+++ b/build/build-plugins.js
@@ -35,7 +35,7 @@ const bsPlugins = {
   Alert: path.resolve(__dirname, '../js/src/alert/alert.js'),
   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.js'),
+  Collapse: path.resolve(__dirname, '../js/src/collapse/collapse.js'),
   Dropdown: path.resolve(__dirname, '../js/src/dropdown.js'),
   Modal: path.resolve(__dirname, '../js/src/modal.js'),
   Popover: path.resolve(__dirname, '../js/src/popover.js'),
diff --git a/js/index.esm.js b/js/index.esm.js
index 4f5058560d..bb8b7509e6 100644
--- a/js/index.esm.js
+++ b/js/index.esm.js
@@ -8,7 +8,7 @@
 import Alert from './src/alert/alert'
 import Button from './src/button/button'
 import Carousel from './src/carousel/carousel'
-import Collapse from './src/collapse'
+import Collapse from './src/collapse/collapse'
 import Dropdown from './src/dropdown'
 import Modal from './src/modal'
 import Popover from './src/popover'
diff --git a/js/index.umd.js b/js/index.umd.js
index f3b81377e5..56f1a32a7d 100644
--- a/js/index.umd.js
+++ b/js/index.umd.js
@@ -8,7 +8,7 @@
 import Alert from './src/alert/alert'
 import Button from './src/button/button'
 import Carousel from './src/carousel/carousel'
-import Collapse from './src/collapse'
+import Collapse from './src/collapse/collapse'
 import Dropdown from './src/dropdown'
 import Modal from './src/modal'
 import Popover from './src/popover'
diff --git a/js/src/collapse.js b/js/src/collapse/collapse.js
similarity index 96%
rename from js/src/collapse.js
rename to js/src/collapse/collapse.js
index 208e64c648..671dc3b6cd 100644
--- a/js/src/collapse.js
+++ b/js/src/collapse/collapse.js
@@ -15,11 +15,11 @@ import {
   makeArray,
   reflow,
   typeCheckConfig
-} from './util/index'
-import Data from './dom/data'
-import EventHandler from './dom/event-handler'
-import Manipulator from './dom/manipulator'
-import SelectorEngine from './dom/selector-engine'
+} from '../util/index'
+import Data from '../dom/data'
+import EventHandler from '../dom/event-handler'
+import Manipulator from '../dom/manipulator'
+import SelectorEngine from '../dom/selector-engine'
 
 /**
  * ------------------------------------------------------------------------
@@ -320,8 +320,11 @@ class Collapse {
 
     makeArray(SelectorEngine.find(selector, parent))
       .forEach(element => {
+        const selector = getSelectorFromElement(element)
+        const selected = selector ? SelectorEngine.findOne(selector) : null
+
         this._addAriaAndCollapsedClass(
-          Collapse._getTargetFromElement(element),
+          selected,
           [element]
         )
       })
@@ -349,11 +352,6 @@ class Collapse {
 
   // Static
 
-  static _getTargetFromElement(element) {
-    const selector = getSelectorFromElement(element)
-    return selector ? SelectorEngine.findOne(selector) : null
-  }
-
   static _collapseInterface(element, config) {
     let data = Data.getData(element, DATA_KEY)
     const _config = {
@@ -431,7 +429,7 @@ EventHandler.on(document, Event.CLICK_DATA_API, Selector.DATA_TOGGLE, function (
  * ------------------------------------------------------------------------
  * add .collapse to jQuery only if jQuery is present
  */
-
+/* istanbul ignore if */
 if (typeof $ !== 'undefined') {
   const JQUERY_NO_CONFLICT = $.fn[NAME]
   $.fn[NAME] = Collapse._jQueryInterface
diff --git a/js/src/collapse/collapse.spec.js b/js/src/collapse/collapse.spec.js
new file mode 100644
index 0000000000..731b4a25f8
--- /dev/null
+++ b/js/src/collapse/collapse.spec.js
@@ -0,0 +1,826 @@
+import Collapse from './collapse'
+import EventHandler from '../dom/event-handler'
+import { makeArray } from '../util/index'
+
+/** Test helpers */
+import { getFixture, clearFixture, jQueryMock } from '../../tests/helpers/fixture'
+
+describe('Collapse', () => {
+  let fixtureEl
+
+  beforeAll(() => {
+    fixtureEl = getFixture()
+  })
+
+  afterEach(() => {
+    clearFixture()
+  })
+
+  describe('VERSION', () => {
+    it('should return plugin version', () => {
+      expect(Collapse.VERSION).toEqual(jasmine.any(String))
+    })
+  })
+
+  describe('Default', () => {
+    it('should return plugin default config', () => {
+      expect(Collapse.Default).toEqual(jasmine.any(Object))
+    })
+  })
+
+  describe('constructor', () => {
+    it('should allow jquery object in parent config', () => {
+      fixtureEl.innerHTML = [
+        '<div class="my-collapse">',
+        '  <div class="item">',
+        '    <a data-toggle="collapse" href="#">Toggle item</a>',
+        '    <div class="collapse">Lorem ipsum</div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const collapseEl = fixtureEl.querySelector('div.collapse')
+      const myCollapseEl = fixtureEl.querySelector('.my-collapse')
+      const fakejQueryObject = {
+        0: myCollapseEl
+      }
+      const collapse = new Collapse(collapseEl, {
+        parent: fakejQueryObject
+      })
+
+      expect(collapse._config.parent).toEqual(fakejQueryObject)
+      expect(collapse._getParent()).toEqual(myCollapseEl)
+    })
+
+    it('should allow non jquery object in parent config', () => {
+      fixtureEl.innerHTML = [
+        '<div class="my-collapse">',
+        '  <div class="item">',
+        '    <a data-toggle="collapse" href="#">Toggle item</a>',
+        '    <div class="collapse">Lorem ipsum</div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const collapseEl = fixtureEl.querySelector('div.collapse')
+      const myCollapseEl = fixtureEl.querySelector('.my-collapse')
+      const collapse = new Collapse(collapseEl, {
+        parent: myCollapseEl
+      })
+
+      expect(collapse._config.parent).toEqual(myCollapseEl)
+    })
+
+    it('should allow string selector in parent config', () => {
+      fixtureEl.innerHTML = [
+        '<div class="my-collapse">',
+        '  <div class="item">',
+        '    <a data-toggle="collapse" href="#">Toggle item</a>',
+        '    <div class="collapse">Lorem ipsum</div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const collapseEl = fixtureEl.querySelector('div.collapse')
+      const myCollapseEl = fixtureEl.querySelector('.my-collapse')
+      const collapse = new Collapse(collapseEl, {
+        parent: 'div.my-collapse'
+      })
+
+      expect(collapse._config.parent).toEqual('div.my-collapse')
+      expect(collapse._getParent()).toEqual(myCollapseEl)
+    })
+  })
+
+  describe('toggle', () => {
+    it('should call show method if show class is not present', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const collapseEl = fixtureEl.querySelector('div')
+      const collapse = new Collapse(collapseEl)
+
+      spyOn(collapse, 'show')
+
+      collapse.toggle()
+
+      expect(collapse.show).toHaveBeenCalled()
+    })
+
+    it('should call hide method if show class is present', () => {
+      fixtureEl.innerHTML = '<div class="show"></div>'
+
+      const collapseEl = fixtureEl.querySelector('.show')
+      const collapse = new Collapse(collapseEl, {
+        toggle: false
+      })
+
+      spyOn(collapse, 'hide')
+
+      collapse.toggle()
+
+      expect(collapse.hide).toHaveBeenCalled()
+    })
+
+    it('should find collapse children if they have collapse class too not only data-parent', done => {
+      fixtureEl.innerHTML = [
+        '<div class="my-collapse">',
+        '  <div class="item">',
+        '    <a data-toggle="collapse" href="#">Toggle item 1</a>',
+        '    <div id="collapse1" class="collapse show">Lorem ipsum 1</div>',
+        '  </div>',
+        '  <div class="item">',
+        '    <a id="triggerCollapse2" data-toggle="collapse" href="#">Toggle item 2</a>',
+        '    <div id="collapse2" class="collapse">Lorem ipsum 2</div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const parent = fixtureEl.querySelector('.my-collapse')
+      const collapseEl1 = fixtureEl.querySelector('#collapse1')
+      const collapseEl2 = fixtureEl.querySelector('#collapse2')
+
+      const collapseList = makeArray(fixtureEl.querySelectorAll('.collapse'))
+        .map(el => new Collapse(el, {
+          parent,
+          toggle: false
+        }))
+
+      collapseEl2.addEventListener('shown.bs.collapse', () => {
+        expect(collapseEl2.classList.contains('show')).toEqual(true)
+        expect(collapseEl1.classList.contains('show')).toEqual(false)
+        done()
+      })
+
+      collapseList[1].toggle()
+    })
+  })
+
+  describe('show', () => {
+    it('should do nothing if is transitioning', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      spyOn(EventHandler, 'trigger')
+
+      const collapseEl = fixtureEl.querySelector('div')
+      const collapse = new Collapse(collapseEl, {
+        toggle: false
+      })
+
+      collapse._isTransitioning = true
+      collapse.show()
+
+      expect(EventHandler.trigger).not.toHaveBeenCalled()
+    })
+
+    it('should do nothing if already shown', () => {
+      fixtureEl.innerHTML = '<div class="show"></div>'
+
+      spyOn(EventHandler, 'trigger')
+
+      const collapseEl = fixtureEl.querySelector('div')
+      const collapse = new Collapse(collapseEl, {
+        toggle: false
+      })
+
+      collapse.show()
+
+      expect(EventHandler.trigger).not.toHaveBeenCalled()
+    })
+
+    it('should show a collapsed element', done => {
+      fixtureEl.innerHTML = '<div class="collapse" style="height: 0px;"></div>'
+
+      const collapseEl = fixtureEl.querySelector('div')
+      const collapse = new Collapse(collapseEl, {
+        toggle: false
+      })
+
+      collapseEl.addEventListener('show.bs.collapse', () => {
+        expect(collapseEl.style.height).toEqual('0px')
+      })
+      collapseEl.addEventListener('shown.bs.collapse', () => {
+        expect(collapseEl.classList.contains('show')).toEqual(true)
+        expect(collapseEl.style.height).toEqual('')
+        done()
+      })
+
+      collapse.show()
+    })
+
+    it('should show a collapsed element on width', done => {
+      fixtureEl.innerHTML = '<div class="collapse width" style="width: 0px;"></div>'
+
+      const collapseEl = fixtureEl.querySelector('div')
+      const collapse = new Collapse(collapseEl, {
+        toggle: false
+      })
+
+      collapseEl.addEventListener('show.bs.collapse', () => {
+        expect(collapseEl.style.width).toEqual('0px')
+      })
+      collapseEl.addEventListener('shown.bs.collapse', () => {
+        expect(collapseEl.classList.contains('show')).toEqual(true)
+        expect(collapseEl.style.width).toEqual('')
+        done()
+      })
+
+      collapse.show()
+    })
+
+    it('should collapse only the first collapse', done => {
+      fixtureEl.innerHTML = [
+        '<div class="card" id="accordion1">',
+        '  <div id="collapse1" class="collapse"/>',
+        '</div>',
+        '<div class="card" id="accordion2">',
+        '  <div id="collapse2" class="collapse show"/>',
+        '</div>'
+      ].join('')
+
+      const el1 = fixtureEl.querySelector('#collapse1')
+      const el2 = fixtureEl.querySelector('#collapse2')
+      const collapse = new Collapse(el1, {
+        toggle: false
+      })
+
+      el1.addEventListener('shown.bs.collapse', () => {
+        expect(el1.classList.contains('show')).toEqual(true)
+        expect(el2.classList.contains('show')).toEqual(true)
+        done()
+      })
+
+      collapse.show()
+    })
+
+    it('should not fire shown when show is prevented', done => {
+      fixtureEl.innerHTML = '<div class="collapse"></div>'
+
+      const collapseEl = fixtureEl.querySelector('div')
+      const collapse = new Collapse(collapseEl, {
+        toggle: false
+      })
+
+      const expectEnd = () => {
+        setTimeout(() => {
+          expect().nothing()
+          done()
+        }, 10)
+      }
+
+      collapseEl.addEventListener('show.bs.collapse', e => {
+        e.preventDefault()
+        expectEnd()
+      })
+
+      collapseEl.addEventListener('shown.bs.collapse', () => {
+        throw new Error('should not fire shown event')
+      })
+
+      collapse.show()
+    })
+  })
+
+  describe('hide', () => {
+    it('should do nothing if is transitioning', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      spyOn(EventHandler, 'trigger')
+
+      const collapseEl = fixtureEl.querySelector('div')
+      const collapse = new Collapse(collapseEl, {
+        toggle: false
+      })
+
+      collapse._isTransitioning = true
+      collapse.hide()
+
+      expect(EventHandler.trigger).not.toHaveBeenCalled()
+    })
+
+    it('should do nothing if already shown', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      spyOn(EventHandler, 'trigger')
+
+      const collapseEl = fixtureEl.querySelector('div')
+      const collapse = new Collapse(collapseEl, {
+        toggle: false
+      })
+
+      collapse.hide()
+
+      expect(EventHandler.trigger).not.toHaveBeenCalled()
+    })
+
+    it('should hide a collapsed element', done => {
+      fixtureEl.innerHTML = '<div class="collapse show"></div>'
+
+      const collapseEl = fixtureEl.querySelector('div')
+      const collapse = new Collapse(collapseEl, {
+        toggle: false
+      })
+
+      collapseEl.addEventListener('hidden.bs.collapse', () => {
+        expect(collapseEl.classList.contains('show')).toEqual(false)
+        expect(collapseEl.style.height).toEqual('')
+        done()
+      })
+
+      collapse.hide()
+    })
+
+    it('should not fire hidden when hide is prevented', done => {
+      fixtureEl.innerHTML = '<div class="collapse show"></div>'
+
+      const collapseEl = fixtureEl.querySelector('div')
+      const collapse = new Collapse(collapseEl, {
+        toggle: false
+      })
+
+      const expectEnd = () => {
+        setTimeout(() => {
+          expect().nothing()
+          done()
+        }, 10)
+      }
+
+      collapseEl.addEventListener('hide.bs.collapse', e => {
+        e.preventDefault()
+        expectEnd()
+      })
+
+      collapseEl.addEventListener('hidden.bs.collapse', () => {
+        throw new Error('should not fire hidden event')
+      })
+
+      collapse.hide()
+    })
+  })
+
+  describe('dispose', () => {
+    it('should destroy a collapse', () => {
+      fixtureEl.innerHTML = '<div class="collapse show"></div>'
+
+      const collapseEl = fixtureEl.querySelector('div')
+      const collapse = new Collapse(collapseEl, {
+        toggle: false
+      })
+
+      expect(Collapse._getInstance(collapseEl)).toEqual(collapse)
+
+      collapse.dispose()
+
+      expect(Collapse._getInstance(collapseEl)).toEqual(null)
+    })
+  })
+
+  describe('data-api', () => {
+    it('should show multiple collapsed elements', done => {
+      fixtureEl.innerHTML = [
+        '<a role="button" data-toggle="collapse" class="collapsed" href=".multi"></a>',
+        '<div id="collapse1" class="collapse multi"/>',
+        '<div id="collapse2" class="collapse multi"/>'
+      ].join('')
+
+      const trigger = fixtureEl.querySelector('a')
+      const collapse1 = fixtureEl.querySelector('#collapse1')
+      const collapse2 = fixtureEl.querySelector('#collapse2')
+
+      collapse2.addEventListener('shown.bs.collapse', () => {
+        expect(trigger.getAttribute('aria-expanded')).toEqual('true')
+        expect(trigger.classList.contains('collapsed')).toEqual(false)
+        expect(collapse1.classList.contains('show')).toEqual(true)
+        expect(collapse1.classList.contains('show')).toEqual(true)
+        done()
+      })
+
+      trigger.click()
+    })
+
+    it('should hide multiple collapsed elements', done => {
+      fixtureEl.innerHTML = [
+        '<a role="button" data-toggle="collapse" href=".multi"></a>',
+        '<div id="collapse1" class="collapse multi show"/>',
+        '<div id="collapse2" class="collapse multi show"/>'
+      ].join('')
+
+      const trigger = fixtureEl.querySelector('a')
+      const collapse1 = fixtureEl.querySelector('#collapse1')
+      const collapse2 = fixtureEl.querySelector('#collapse2')
+
+      collapse2.addEventListener('hidden.bs.collapse', () => {
+        expect(trigger.getAttribute('aria-expanded')).toEqual('false')
+        expect(trigger.classList.contains('collapsed')).toEqual(true)
+        expect(collapse1.classList.contains('show')).toEqual(false)
+        expect(collapse1.classList.contains('show')).toEqual(false)
+        done()
+      })
+
+      trigger.click()
+    })
+
+    it('should remove "collapsed" class from target when collapse is shown', done => {
+      fixtureEl.innerHTML = [
+        '<a id="link1" role="button" data-toggle="collapse" class="collapsed" href="#" data-target="#test1" />',
+        '<a id="link2" role="button" data-toggle="collapse" class="collapsed" href="#" data-target="#test1" />',
+        '<div id="test1"></div>'
+      ].join('')
+
+      const link1 = fixtureEl.querySelector('#link1')
+      const link2 = fixtureEl.querySelector('#link2')
+      const collapseTest1 = fixtureEl.querySelector('#test1')
+
+      collapseTest1.addEventListener('shown.bs.collapse', () => {
+        expect(link1.getAttribute('aria-expanded')).toEqual('true')
+        expect(link2.getAttribute('aria-expanded')).toEqual('true')
+        expect(link1.classList.contains('collapsed')).toEqual(false)
+        expect(link2.classList.contains('collapsed')).toEqual(false)
+        done()
+      })
+
+      link1.click()
+    })
+
+    it('should add "collapsed" class to target when collapse is hidden', done => {
+      fixtureEl.innerHTML = [
+        '<a id="link1" role="button" data-toggle="collapse" href="#" data-target="#test1" />',
+        '<a id="link2" role="button" data-toggle="collapse" href="#" data-target="#test1" />',
+        '<div id="test1" class="show"></div>'
+      ].join('')
+
+      const link1 = fixtureEl.querySelector('#link1')
+      const link2 = fixtureEl.querySelector('#link2')
+      const collapseTest1 = fixtureEl.querySelector('#test1')
+
+      collapseTest1.addEventListener('hidden.bs.collapse', () => {
+        expect(link1.getAttribute('aria-expanded')).toEqual('false')
+        expect(link2.getAttribute('aria-expanded')).toEqual('false')
+        expect(link1.classList.contains('collapsed')).toEqual(true)
+        expect(link2.classList.contains('collapsed')).toEqual(true)
+        done()
+      })
+
+      link1.click()
+    })
+
+    it('should allow accordion to use children other than card', done => {
+      fixtureEl.innerHTML = [
+        '<div id="accordion">',
+        '  <div class="item">',
+        '    <a id="linkTrigger" data-toggle="collapse" href="#collapseOne" aria-expanded="false" aria-controls="collapseOne"></a>',
+        '    <div id="collapseOne" class="collapse" role="tabpanel" aria-labelledby="headingThree" data-parent="#accordion"></div>',
+        '  </div>',
+        '  <div class="item">',
+        '    <a id="linkTriggerTwo" data-toggle="collapse" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo"></a>',
+        '    <div id="collapseTwo" class="collapse show" role="tabpanel" aria-labelledby="headingTwo" data-parent="#accordion"></div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const trigger = fixtureEl.querySelector('#linkTrigger')
+      const triggerTwo = fixtureEl.querySelector('#linkTriggerTwo')
+      const collapseOne = fixtureEl.querySelector('#collapseOne')
+      const collapseTwo = fixtureEl.querySelector('#collapseTwo')
+
+      collapseOne.addEventListener('shown.bs.collapse', () => {
+        expect(collapseOne.classList.contains('show')).toEqual(true)
+        expect(collapseTwo.classList.contains('show')).toEqual(false)
+
+        collapseTwo.addEventListener('shown.bs.collapse', () => {
+          expect(collapseOne.classList.contains('show')).toEqual(false)
+          expect(collapseTwo.classList.contains('show')).toEqual(true)
+          done()
+        })
+
+        triggerTwo.click()
+      })
+
+      trigger.click()
+    })
+
+    it('should not prevent event for input', done => {
+      fixtureEl.innerHTML = [
+        '<input type="checkbox" data-toggle="collapse" data-target="#collapsediv1" />',
+        '<div id="collapsediv1"></div>'
+      ].join('')
+
+      const target = fixtureEl.querySelector('input')
+      const collapseEl = fixtureEl.querySelector('#collapsediv1')
+
+      collapseEl.addEventListener('shown.bs.collapse', () => {
+        expect(collapseEl.classList.contains('show')).toEqual(true)
+        expect(target.checked).toEqual(true)
+        done()
+      })
+
+      target.click()
+    })
+
+    it('should allow accordion to contain nested elements', done => {
+      fixtureEl.innerHTML = [
+        '<div id="accordion">',
+        '  <div class="row">',
+        '    <div class="col-lg-6">',
+        '      <div class="item">',
+        '        <a id="linkTrigger" data-toggle="collapse" href="#collapseOne" aria-expanded="false" aria-controls="collapseOne"></a>',
+        '        <div id="collapseOne" class="collapse" role="tabpanel" aria-labelledby="headingThree" data-parent="#accordion"></div>',
+        '      </div>',
+        '    </div>',
+        '    <div class="col-lg-6">',
+        '      <div class="item">',
+        '        <a id="linkTriggerTwo" data-toggle="collapse" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo"></a>',
+        '        <div id="collapseTwo" class="collapse show" role="tabpanel" aria-labelledby="headingTwo" data-parent="#accordion"></div>',
+        '      </div>',
+        '    </div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const triggerEl = fixtureEl.querySelector('#linkTrigger')
+      const triggerTwoEl = fixtureEl.querySelector('#linkTriggerTwo')
+      const collapseOneEl = fixtureEl.querySelector('#collapseOne')
+      const collapseTwoEl = fixtureEl.querySelector('#collapseTwo')
+
+      collapseOneEl.addEventListener('shown.bs.collapse', () => {
+        expect(collapseOneEl.classList.contains('show')).toEqual(true)
+        expect(triggerEl.classList.contains('collapsed')).toEqual(false)
+        expect(triggerEl.getAttribute('aria-expanded')).toEqual('true')
+
+        expect(collapseTwoEl.classList.contains('show')).toEqual(false)
+        expect(triggerTwoEl.classList.contains('collapsed')).toEqual(true)
+        expect(triggerTwoEl.getAttribute('aria-expanded')).toEqual('false')
+
+        collapseTwoEl.addEventListener('shown.bs.collapse', () => {
+          expect(collapseOneEl.classList.contains('show')).toEqual(false)
+          expect(triggerEl.classList.contains('collapsed')).toEqual(true)
+          expect(triggerEl.getAttribute('aria-expanded')).toEqual('false')
+
+          expect(collapseTwoEl.classList.contains('show')).toEqual(true)
+          expect(triggerTwoEl.classList.contains('collapsed')).toEqual(false)
+          expect(triggerTwoEl.getAttribute('aria-expanded')).toEqual('true')
+          done()
+        })
+
+        triggerTwoEl.click()
+      })
+
+      triggerEl.click()
+    })
+
+    it('should allow accordion to target multiple elements', done => {
+      fixtureEl.innerHTML = [
+        '<div id="accordion">',
+        '  <a id="linkTriggerOne" data-toggle="collapse" data-target=".collapseOne" href="#" aria-expanded="false" aria-controls="collapseOne"></a>',
+        '  <a id="linkTriggerTwo" data-toggle="collapse" data-target=".collapseTwo" href="#" aria-expanded="false" aria-controls="collapseTwo"></a>',
+        '  <div id="collapseOneOne" class="collapse collapseOne" role="tabpanel" data-parent="#accordion"></div>',
+        '  <div id="collapseOneTwo" class="collapse collapseOne" role="tabpanel" data-parent="#accordion"></div>',
+        '  <div id="collapseTwoOne" class="collapse collapseTwo" role="tabpanel" data-parent="#accordion"></div>',
+        '  <div id="collapseTwoTwo" class="collapse collapseTwo" role="tabpanel" data-parent="#accordion"></div>',
+        '</div>'
+      ].join('')
+
+      const trigger = fixtureEl.querySelector('#linkTriggerOne')
+      const triggerTwo = fixtureEl.querySelector('#linkTriggerTwo')
+      const collapseOneOne = fixtureEl.querySelector('#collapseOneOne')
+      const collapseOneTwo = fixtureEl.querySelector('#collapseOneTwo')
+      const collapseTwoOne = fixtureEl.querySelector('#collapseTwoOne')
+      const collapseTwoTwo = fixtureEl.querySelector('#collapseTwoTwo')
+      const collapsedElements = {
+        one: false,
+        two: false
+      }
+
+      function firstTest() {
+        expect(collapseOneOne.classList.contains('show')).toEqual(true)
+        expect(collapseOneTwo.classList.contains('show')).toEqual(true)
+
+        expect(collapseTwoOne.classList.contains('show')).toEqual(false)
+        expect(collapseTwoTwo.classList.contains('show')).toEqual(false)
+
+        triggerTwo.click()
+      }
+
+      function secondTest() {
+        expect(collapseOneOne.classList.contains('show')).toEqual(false)
+        expect(collapseOneTwo.classList.contains('show')).toEqual(false)
+
+        expect(collapseTwoOne.classList.contains('show')).toEqual(true)
+        expect(collapseTwoTwo.classList.contains('show')).toEqual(true)
+        done()
+      }
+
+      collapseOneOne.addEventListener('shown.bs.collapse', () => {
+        if (collapsedElements.one) {
+          firstTest()
+        } else {
+          collapsedElements.one = true
+        }
+      })
+
+      collapseOneTwo.addEventListener('shown.bs.collapse', () => {
+        if (collapsedElements.one) {
+          firstTest()
+        } else {
+          collapsedElements.one = true
+        }
+      })
+
+      collapseTwoOne.addEventListener('shown.bs.collapse', () => {
+        if (collapsedElements.two) {
+          secondTest()
+        } else {
+          collapsedElements.two = true
+        }
+      })
+
+      collapseTwoTwo.addEventListener('shown.bs.collapse', () => {
+        if (collapsedElements.two) {
+          secondTest()
+        } else {
+          collapsedElements.two = true
+        }
+      })
+
+      trigger.click()
+    })
+
+    it('should collapse accordion children but not nested accordion children', done => {
+      fixtureEl.innerHTML = [
+        '<div id="accordion">',
+        '  <div class="item">',
+        '    <a id="linkTrigger" data-toggle="collapse" href="#collapseOne" aria-expanded="false" aria-controls="collapseOne"></a>',
+        '    <div id="collapseOne" data-parent="#accordion" class="collapse" role="tabpanel" aria-labelledby="headingThree">',
+        '      <div id="nestedAccordion">',
+        '        <div class="item">',
+        '          <a id="nestedLinkTrigger" data-toggle="collapse" href="#nestedCollapseOne" aria-expanded="false" aria-controls="nestedCollapseOne"></a>',
+        '          <div id="nestedCollapseOne" data-parent="#nestedAccordion" class="collapse" role="tabpanel" aria-labelledby="headingThree"></div>',
+        '        </div>',
+        '      </div>',
+        '    </div>',
+        '  </div>',
+        '  <div class="item">',
+        '    <a id="linkTriggerTwo" data-toggle="collapse" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo"></a>',
+        '    <div id="collapseTwo" data-parent="#accordion" class="collapse show" role="tabpanel" aria-labelledby="headingTwo"></div>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const trigger = fixtureEl.querySelector('#linkTrigger')
+      const triggerTwo = fixtureEl.querySelector('#linkTriggerTwo')
+      const nestedTrigger = fixtureEl.querySelector('#nestedLinkTrigger')
+      const collapseOne = fixtureEl.querySelector('#collapseOne')
+      const collapseTwo = fixtureEl.querySelector('#collapseTwo')
+      const nestedCollapseOne = fixtureEl.querySelector('#nestedCollapseOne')
+
+      function handlerCollapseOne() {
+        expect(collapseOne.classList.contains('show')).toEqual(true)
+        expect(collapseTwo.classList.contains('show')).toEqual(false)
+        expect(nestedCollapseOne.classList.contains('show')).toEqual(false)
+
+        nestedCollapseOne.addEventListener('shown.bs.collapse', handlerNestedCollapseOne)
+        nestedTrigger.click()
+        collapseOne.removeEventListener('shown.bs.collapse', handlerCollapseOne)
+      }
+
+      function handlerNestedCollapseOne() {
+        expect(collapseOne.classList.contains('show')).toEqual(true)
+        expect(collapseTwo.classList.contains('show')).toEqual(false)
+        expect(nestedCollapseOne.classList.contains('show')).toEqual(true)
+
+        collapseTwo.addEventListener('shown.bs.collapse', () => {
+          expect(collapseOne.classList.contains('show')).toEqual(false)
+          expect(collapseTwo.classList.contains('show')).toEqual(true)
+          expect(nestedCollapseOne.classList.contains('show')).toEqual(true)
+          done()
+        })
+
+        triggerTwo.click()
+        nestedCollapseOne.removeEventListener('shown.bs.collapse', handlerNestedCollapseOne)
+      }
+
+      collapseOne.addEventListener('shown.bs.collapse', handlerCollapseOne)
+      trigger.click()
+    })
+
+    it('should add "collapsed" class and set aria-expanded to triggers only when all the targeted collapse are hidden', done => {
+      fixtureEl.innerHTML = [
+        '<a id="trigger1" role="button" data-toggle="collapse" href="#test1"/>',
+        '<a id="trigger2" role="button" data-toggle="collapse" href="#test2"/>',
+        '<a id="trigger3" role="button" data-toggle="collapse" href=".multi"/>',
+        '<div id="test1" class="multi"/>',
+        '<div id="test2" class="multi"/>'
+      ].join('')
+
+      const trigger1 = fixtureEl.querySelector('#trigger1')
+      const trigger2 = fixtureEl.querySelector('#trigger2')
+      const trigger3 = fixtureEl.querySelector('#trigger3')
+      const target1 = fixtureEl.querySelector('#test1')
+      const target2 = fixtureEl.querySelector('#test2')
+
+      const target2Shown = () => {
+        expect(trigger1.classList.contains('collapsed')).toEqual(false)
+        expect(trigger1.getAttribute('aria-expanded')).toEqual('true')
+
+        expect(trigger2.classList.contains('collapsed')).toEqual(false)
+        expect(trigger2.getAttribute('aria-expanded')).toEqual('true')
+
+        expect(trigger3.classList.contains('collapsed')).toEqual(false)
+        expect(trigger3.getAttribute('aria-expanded')).toEqual('true')
+
+        target2.addEventListener('hidden.bs.collapse', () => {
+          expect(trigger1.classList.contains('collapsed')).toEqual(false)
+          expect(trigger1.getAttribute('aria-expanded')).toEqual('true')
+
+          expect(trigger2.classList.contains('collapsed')).toEqual(true)
+          expect(trigger2.getAttribute('aria-expanded')).toEqual('false')
+
+          expect(trigger3.classList.contains('collapsed')).toEqual(false)
+          expect(trigger3.getAttribute('aria-expanded')).toEqual('true')
+
+          target1.addEventListener('hidden.bs.collapse', () => {
+            expect(trigger1.classList.contains('collapsed')).toEqual(true)
+            expect(trigger1.getAttribute('aria-expanded')).toEqual('false')
+
+            expect(trigger2.classList.contains('collapsed')).toEqual(true)
+            expect(trigger2.getAttribute('aria-expanded')).toEqual('false')
+
+            expect(trigger3.classList.contains('collapsed')).toEqual(true)
+            expect(trigger3.getAttribute('aria-expanded')).toEqual('false')
+            done()
+          })
+
+          trigger1.click()
+        })
+
+        trigger2.click()
+      }
+
+      target2.addEventListener('shown.bs.collapse', target2Shown)
+      trigger3.click()
+    })
+  })
+
+  describe('_jQueryInterface', () => {
+    it('should create a collapse', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+
+      jQueryMock.fn.collapse = Collapse._jQueryInterface
+      jQueryMock.elements = [div]
+
+      jQueryMock.fn.collapse.call(jQueryMock)
+
+      expect(Collapse._getInstance(div)).toBeDefined()
+    })
+
+    it('should not re create a collapse', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+      const collapse = new Collapse(div)
+
+      jQueryMock.fn.collapse = Collapse._jQueryInterface
+      jQueryMock.elements = [div]
+
+      jQueryMock.fn.collapse.call(jQueryMock)
+
+      expect(Collapse._getInstance(div)).toEqual(collapse)
+    })
+
+    it('should throw error on undefined method', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+      const action = 'undefinedMethod'
+
+      jQueryMock.fn.collapse = Collapse._jQueryInterface
+      jQueryMock.elements = [div]
+
+      try {
+        jQueryMock.fn.collapse.call(jQueryMock, action)
+      } catch (error) {
+        expect(error.message).toEqual(`No method named "${action}"`)
+      }
+    })
+  })
+
+  describe('_getInstance', () => {
+    it('should return collapse instance', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+      const collapse = new Collapse(div)
+
+      expect(Collapse._getInstance(div)).toEqual(collapse)
+    })
+
+    it('should return null when there is no collapse instance', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+
+      expect(Collapse._getInstance(div)).toEqual(null)
+    })
+  })
+})
diff --git a/js/tests/unit/collapse.js b/js/tests/unit/collapse.js
deleted file mode 100644
index d0b465551d..0000000000
--- a/js/tests/unit/collapse.js
+++ /dev/null
@@ -1,905 +0,0 @@
-$(function () {
-  'use strict'
-
-  var Collapse = typeof window.bootstrap === 'undefined' ? window.Collapse : window.bootstrap.Collapse
-
-  QUnit.module('collapse plugin')
-
-  QUnit.test('should be defined on jquery object', function (assert) {
-    assert.expect(1)
-    assert.ok($(document.body).collapse, 'collapse method is defined')
-  })
-
-  QUnit.module('collapse', {
-    beforeEach: function () {
-      // Run all tests in noConflict mode -- it's the only way to ensure that the plugin works in noConflict mode
-      $.fn.bootstrapCollapse = $.fn.collapse.noConflict()
-    },
-    afterEach: function () {
-      $.fn.collapse = $.fn.bootstrapCollapse
-      delete $.fn.bootstrapCollapse
-      $('#qunit-fixture').html('')
-    }
-  })
-
-  QUnit.test('should provide no conflict', function (assert) {
-    assert.expect(1)
-    assert.strictEqual(typeof $.fn.collapse, 'undefined', 'collapse 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.bootstrapCollapse()
-    try {
-      $el.bootstrapCollapse('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/>')
-    var $collapse = $el.bootstrapCollapse()
-    assert.ok($collapse instanceof $, 'returns jquery collection')
-    assert.strictEqual($collapse[0], $el[0], 'collection contains element')
-  })
-
-  QUnit.test('should show a collapsed element', function (assert) {
-    assert.expect(2)
-    var done = assert.async()
-    var $el = $('<div class="collapse"/>')
-
-    $el.one('shown.bs.collapse', function () {
-      assert.ok($el.hasClass('show'), 'has class "show"')
-      assert.ok(!/height/i.test($el.attr('style')), 'has height reset')
-      done()
-    }).bootstrapCollapse('show')
-  })
-
-  QUnit.test('should show multiple collapsed elements', function (assert) {
-    assert.expect(4)
-    var done = assert.async()
-    var $target = $('<a role="button" data-toggle="collapse" class="collapsed" href=".multi"/>').appendTo('#qunit-fixture')
-    var $el = $('<div class="collapse multi"/>').appendTo('#qunit-fixture')
-    var $el2 = $('<div class="collapse multi"/>').appendTo('#qunit-fixture')
-    $el.one('shown.bs.collapse', function () {
-      assert.ok($el.hasClass('show'), 'has class "show"')
-      assert.ok(!/height/i.test($el.attr('style')), 'has height reset')
-    })
-    $el2.one('shown.bs.collapse', function () {
-      assert.ok($el2.hasClass('show'), 'has class "show"')
-      assert.ok(!/height/i.test($el2.attr('style')), 'has height reset')
-      done()
-    })
-    $target[0].click()
-  })
-
-  QUnit.test('should collapse only the first collapse', function (assert) {
-    assert.expect(2)
-    var done = assert.async()
-    var html = [
-      '<div class="panel-group" id="accordion1">',
-      '<div class="panel">',
-      '<div id="collapse1" class="collapse"/>',
-      '</div>',
-      '</div>',
-      '<div class="panel-group" id="accordion2">',
-      '<div class="panel">',
-      '<div id="collapse2" class="collapse show"/>',
-      '</div>',
-      '</div>'
-    ].join('')
-    $(html).appendTo('#qunit-fixture')
-    var $el1 = $('#collapse1')
-    var $el2 = $('#collapse2')
-    $el1.one('shown.bs.collapse', function () {
-      assert.ok($el1.hasClass('show'))
-      assert.ok($el2.hasClass('show'))
-      done()
-    }).bootstrapCollapse('show')
-  })
-
-  QUnit.test('should hide a collapsed element', function (assert) {
-    assert.expect(1)
-    var $el = $('<div class="collapse"/>').bootstrapCollapse('hide')
-
-    assert.ok(!$el.hasClass('show'), 'does not have class "show"')
-  })
-
-  QUnit.test('should not fire shown when show is prevented', function (assert) {
-    assert.expect(1)
-    var done = assert.async()
-
-    $('<div class="collapse"/>')
-      .on('show.bs.collapse', function (e) {
-        e.preventDefault()
-        assert.ok(true, 'show event fired')
-        done()
-      })
-      .on('shown.bs.collapse', function () {
-        assert.ok(false, 'shown event fired')
-      })
-      .bootstrapCollapse('show')
-  })
-
-  QUnit.test('should reset style to auto after finishing opening collapse', function (assert) {
-    assert.expect(2)
-    var done = assert.async()
-
-    $('<div class="collapse" style="height: 0px"/>')
-      .on('show.bs.collapse', function () {
-        assert.strictEqual(this.style.height, '0px', 'height is 0px')
-      })
-      .on('shown.bs.collapse', function () {
-        assert.strictEqual(this.style.height, '', 'height is auto')
-        done()
-      })
-      .bootstrapCollapse('show')
-  })
-
-  QUnit.test('should reset style to auto after finishing closing collapse', function (assert) {
-    assert.expect(1)
-    var done = assert.async()
-
-    $('<div class="collapse"/>')
-      .on('shown.bs.collapse', function () {
-        $(this).bootstrapCollapse('hide')
-      })
-      .on('hidden.bs.collapse', function () {
-        assert.strictEqual(this.style.height, '', 'height is auto')
-        done()
-      })
-      .bootstrapCollapse('show')
-  })
-
-  QUnit.test('should remove "collapsed" class from target when collapse is shown', function (assert) {
-    assert.expect(1)
-    var done = assert.async()
-
-    var $target = $('<a role="button" data-toggle="collapse" class="collapsed" href="#test1"/>').appendTo('#qunit-fixture')
-
-    $('<div id="test1"/>')
-      .appendTo('#qunit-fixture')
-      .on('shown.bs.collapse', function () {
-        assert.ok(!$target.hasClass('collapsed'), 'target does not have collapsed class')
-        done()
-      })
-
-    $target[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should add "collapsed" class to target when collapse is hidden', function (assert) {
-    assert.expect(1)
-    var done = assert.async()
-
-    var $target = $('<a role="button" data-toggle="collapse" href="#test1"/>').appendTo('#qunit-fixture')
-
-    $('<div id="test1" class="show"/>')
-      .appendTo('#qunit-fixture')
-      .on('hidden.bs.collapse', function () {
-        assert.ok($target.hasClass('collapsed'), 'target has collapsed class')
-        done()
-      })
-
-    $target[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should remove "collapsed" class from all triggers targeting the collapse when the collapse is shown', function (assert) {
-    assert.expect(2)
-    var done = assert.async()
-
-    var $target = $('<a role="button" data-toggle="collapse" class="collapsed" href="#test1"/>').appendTo('#qunit-fixture')
-    var $alt = $('<a role="button" data-toggle="collapse" class="collapsed" href="#test1"/>').appendTo('#qunit-fixture')
-
-    $('<div id="test1"/>')
-      .appendTo('#qunit-fixture')
-      .on('shown.bs.collapse', function () {
-        assert.ok(!$target.hasClass('collapsed'), 'target trigger does not have collapsed class')
-        assert.ok(!$alt.hasClass('collapsed'), 'alt trigger does not have collapsed class')
-        done()
-      })
-
-    $target[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should add "collapsed" class to all triggers targeting the collapse when the collapse is hidden', function (assert) {
-    assert.expect(2)
-    var done = assert.async()
-
-    var $target = $('<a role="button" data-toggle="collapse" href="#test1"/>').appendTo('#qunit-fixture')
-    var $alt = $('<a role="button" data-toggle="collapse" href="#test1"/>').appendTo('#qunit-fixture')
-
-    $('<div id="test1" class="show"/>')
-      .appendTo('#qunit-fixture')
-      .on('hidden.bs.collapse', function () {
-        assert.ok($target.hasClass('collapsed'), 'target has collapsed class')
-        assert.ok($alt.hasClass('collapsed'), 'alt trigger has collapsed class')
-        done()
-      })
-
-    $target[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should not close a collapse when initialized with "show" option if already shown', function (assert) {
-    assert.expect(0)
-    var done = assert.async()
-
-    var $test = $('<div id="test1" class="show"/>')
-      .appendTo('#qunit-fixture')
-      .on('hide.bs.collapse', function () {
-        assert.ok(false)
-      })
-
-    $test.bootstrapCollapse('show')
-
-    setTimeout(done, 0)
-  })
-
-  QUnit.test('should open a collapse when initialized with "show" option if not already shown', function (assert) {
-    assert.expect(1)
-    var done = assert.async()
-
-    var $test = $('<div id="test1" />')
-      .appendTo('#qunit-fixture')
-      .on('show.bs.collapse', function () {
-        assert.ok(true)
-      })
-
-    $test.bootstrapCollapse('show')
-
-    setTimeout(done, 0)
-  })
-
-  QUnit.test('should not show a collapse when initialized with "hide" option if already hidden', function (assert) {
-    assert.expect(0)
-    var done = assert.async()
-
-    $('<div class="collapse"></div>')
-      .appendTo('#qunit-fixture')
-      .on('show.bs.collapse', function () {
-        assert.ok(false, 'showing a previously-uninitialized hidden collapse when the "hide" method is called')
-      })
-      .bootstrapCollapse('hide')
-
-    setTimeout(done, 0)
-  })
-
-  QUnit.test('should hide a collapse when initialized with "hide" option if not already hidden', function (assert) {
-    assert.expect(1)
-    var done = assert.async()
-
-    $('<div class="collapse show"></div>')
-      .appendTo('#qunit-fixture')
-      .on('hide.bs.collapse', function () {
-        assert.ok(true, 'hiding a previously-uninitialized shown collapse when the "hide" method is called')
-      })
-      .bootstrapCollapse('hide')
-
-    setTimeout(done, 0)
-  })
-
-  QUnit.test('should remove "collapsed" class from active accordion target', function (assert) {
-    assert.expect(3)
-    var done = assert.async()
-
-    var accordionHTML = '<div id="accordion">' +
-        '<div class="card"/>' +
-        '<div class="card"/>' +
-        '<div class="card"/>' +
-        '</div>'
-    var $groups = $(accordionHTML).appendTo('#qunit-fixture').find('.card')
-
-    var $target1 = $('<a role="button" data-toggle="collapse" href="#body1" />').appendTo($groups.eq(0))
-
-    $('<div id="body1" class="show" data-parent="#accordion"/>').appendTo($groups.eq(0))
-
-    var $target2 = $('<a class="collapsed" data-toggle="collapse" role="button" href="#body2" />').appendTo($groups.eq(1))
-
-    $('<div id="body2" data-parent="#accordion"/>').appendTo($groups.eq(1))
-
-    var $target3 = $('<a class="collapsed" data-toggle="collapse" role="button" href="#body3" />').appendTo($groups.eq(2))
-
-    $('<div id="body3" data-parent="#accordion"/>')
-      .appendTo($groups.eq(2))
-      .on('shown.bs.collapse', function () {
-        assert.ok($target1.hasClass('collapsed'), 'inactive target 1 does have class "collapsed"')
-        assert.ok($target2.hasClass('collapsed'), 'inactive target 2 does have class "collapsed"')
-        assert.ok(!$target3.hasClass('collapsed'), 'active target 3 does not have class "collapsed"')
-
-        done()
-      })
-
-    $target3[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should allow dots in data-parent', function (assert) {
-    assert.expect(3)
-    var done = assert.async()
-
-    var accordionHTML = '<div class="accordion">' +
-        '<div class="card"/>' +
-        '<div class="card"/>' +
-        '<div class="card"/>' +
-        '</div>'
-    var $groups = $(accordionHTML).appendTo('#qunit-fixture').find('.card')
-
-    var $target1 = $('<a role="button" data-toggle="collapse" href="#body1"/>').appendTo($groups.eq(0))
-
-    $('<div id="body1" class="show" data-parent=".accordion"/>').appendTo($groups.eq(0))
-
-    var $target2 = $('<a class="collapsed" data-toggle="collapse" role="button" href="#body2"/>').appendTo($groups.eq(1))
-
-    $('<div id="body2" data-parent=".accordion"/>').appendTo($groups.eq(1))
-
-    var $target3 = $('<a class="collapsed" data-toggle="collapse" role="button" href="#body3"/>').appendTo($groups.eq(2))
-
-    $('<div id="body3" data-parent=".accordion"/>')
-      .appendTo($groups.eq(2))
-      .on('shown.bs.collapse', function () {
-        assert.ok($target1.hasClass('collapsed'), 'inactive target 1 does have class "collapsed"')
-        assert.ok($target2.hasClass('collapsed'), 'inactive target 2 does have class "collapsed"')
-        assert.ok(!$target3.hasClass('collapsed'), 'active target 3 does not have class "collapsed"')
-
-        done()
-      })
-
-    $target3[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should set aria-expanded="true" on trigger/control when collapse is shown', function (assert) {
-    assert.expect(1)
-    var done = assert.async()
-
-    var $target = $('<a role="button" data-toggle="collapse" class="collapsed" href="#test1" aria-expanded="false"/>').appendTo('#qunit-fixture')
-
-    $('<div id="test1"/>')
-      .appendTo('#qunit-fixture')
-      .on('shown.bs.collapse', function () {
-        assert.strictEqual($target.attr('aria-expanded'), 'true', 'aria-expanded on target is "true"')
-        done()
-      })
-
-    $target[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should set aria-expanded="false" on trigger/control when collapse is hidden', function (assert) {
-    assert.expect(1)
-    var done = assert.async()
-
-    var $target = $('<a role="button" data-toggle="collapse" href="#test1" aria-expanded="true"/>').appendTo('#qunit-fixture')
-
-    $('<div id="test1" class="show"/>')
-      .appendTo('#qunit-fixture')
-      .on('hidden.bs.collapse', function () {
-        assert.strictEqual($target.attr('aria-expanded'), 'false', 'aria-expanded on target is "false"')
-        done()
-      })
-
-    $target[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should set aria-expanded="true" on all triggers targeting the collapse when the collapse is shown', function (assert) {
-    assert.expect(2)
-    var done = assert.async()
-
-    var $target = $('<a role="button" data-toggle="collapse" class="collapsed" href="#test1" aria-expanded="false"/>').appendTo('#qunit-fixture')
-    var $alt = $('<a role="button" data-toggle="collapse" class="collapsed" href="#test1" aria-expanded="false"/>').appendTo('#qunit-fixture')
-
-    $('<div id="test1"/>')
-      .appendTo('#qunit-fixture')
-      .on('shown.bs.collapse', function () {
-        assert.strictEqual($target.attr('aria-expanded'), 'true', 'aria-expanded on trigger/control is "true"')
-        assert.strictEqual($alt.attr('aria-expanded'), 'true', 'aria-expanded on alternative trigger/control is "true"')
-        done()
-      })
-
-    $target[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should set aria-expanded="false" on all triggers targeting the collapse when the collapse is hidden', function (assert) {
-    assert.expect(2)
-    var done = assert.async()
-
-    var $target = $('<a role="button" data-toggle="collapse" href="#test1" aria-expanded="true"/>').appendTo('#qunit-fixture')
-    var $alt = $('<a role="button" data-toggle="collapse" href="#test1" aria-expanded="true"/>').appendTo('#qunit-fixture')
-
-    $('<div id="test1" class="show"/>')
-      .appendTo('#qunit-fixture')
-      .on('hidden.bs.collapse', function () {
-        assert.strictEqual($target.attr('aria-expanded'), 'false', 'aria-expanded on trigger/control is "false"')
-        assert.strictEqual($alt.attr('aria-expanded'), 'false', 'aria-expanded on alternative trigger/control is "false"')
-        done()
-      })
-
-    $target[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should change aria-expanded from active accordion trigger/control to "false" and set the trigger/control for the newly active one to "true"', function (assert) {
-    assert.expect(3)
-    var done = assert.async()
-
-    var accordionHTML = '<div id="accordion">' +
-        '<div class="card"/>' +
-        '<div class="card"/>' +
-        '<div class="card"/>' +
-        '</div>'
-    var $groups = $(accordionHTML).appendTo('#qunit-fixture').find('.card')
-
-    var $target1 = $('<a role="button" data-toggle="collapse" aria-expanded="true" href="#body1"/>').appendTo($groups.eq(0))
-
-    $('<div id="body1" class="show" data-parent="#accordion"/>').appendTo($groups.eq(0))
-
-    var $target2 = $('<a role="button" data-toggle="collapse" aria-expanded="false" href="#body2" class="collapsed" aria-expanded="false" />').appendTo($groups.eq(1))
-
-    $('<div id="body2" data-parent="#accordion"/>').appendTo($groups.eq(1))
-
-    var $target3 = $('<a class="collapsed" data-toggle="collapse" aria-expanded="false" role="button" href="#body3"/>').appendTo($groups.eq(2))
-
-    $('<div id="body3" data-parent="#accordion"/>')
-      .appendTo($groups.eq(2))
-      .on('shown.bs.collapse', function () {
-        assert.strictEqual($target1.attr('aria-expanded'), 'false', 'inactive trigger/control 1 has aria-expanded="false"')
-        assert.strictEqual($target2.attr('aria-expanded'), 'false', 'inactive trigger/control 2 has aria-expanded="false"')
-        assert.strictEqual($target3.attr('aria-expanded'), 'true', 'active trigger/control 3 has aria-expanded="true"')
-
-        done()
-      })
-
-    $target3[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should not fire show event if show is prevented because other element is still transitioning', function (assert) {
-    assert.expect(1)
-    var done = assert.async()
-
-    var accordionHTML = '<div id="accordion">' +
-        '<div class="card"/>' +
-        '<div class="card"/>' +
-        '</div>'
-    var showFired = false
-    var $groups = $(accordionHTML).appendTo('#qunit-fixture').find('.card')
-
-    var $target1 = $('<a role="button" data-toggle="collapse" href="#body1"/>').appendTo($groups.eq(0))
-
-    $('<div id="body1" class="collapse" data-parent="#accordion"/>')
-      .appendTo($groups.eq(0))
-      .on('show.bs.collapse', function () {
-        showFired = true
-      })
-
-    var $target2 = $('<a role="button" data-toggle="collapse" href="#body2"/>').appendTo($groups.eq(1))
-    var $body2 = $('<div id="body2" class="collapse" data-parent="#accordion"/>').appendTo($groups.eq(1))
-
-    $target2[0].dispatchEvent(new Event('click'))
-
-    $body2.toggleClass('show collapsing')
-    Collapse._getInstance($body2[0])._isTransitioning = true
-
-    $target1[0].dispatchEvent(new Event('click'))
-
-    setTimeout(function () {
-      assert.ok(!showFired, 'show event did not fire')
-      done()
-    }, 1)
-  })
-
-  QUnit.test('should add "collapsed" class to target when collapse is hidden via manual invocation', function (assert) {
-    assert.expect(1)
-    var done = assert.async()
-
-    var $target = $('<a role="button" data-toggle="collapse" href="#test1"/>').appendTo('#qunit-fixture')
-
-    $('<div id="test1" class="show"/>')
-      .appendTo('#qunit-fixture')
-      .on('hidden.bs.collapse', function () {
-        assert.ok($target.hasClass('collapsed'))
-        done()
-      })
-      .bootstrapCollapse('hide')
-  })
-
-  QUnit.test('should remove "collapsed" class from target when collapse is shown via manual invocation', function (assert) {
-    assert.expect(1)
-    var done = assert.async()
-
-    var $target = $('<a role="button" data-toggle="collapse" class="collapsed" href="#test1"/>').appendTo('#qunit-fixture')
-
-    $('<div id="test1"/>')
-      .appendTo('#qunit-fixture')
-      .on('shown.bs.collapse', function () {
-        assert.ok(!$target.hasClass('collapsed'))
-        done()
-      })
-      .bootstrapCollapse('show')
-  })
-
-  QUnit.test('should allow accordion to use children other than card', function (assert) {
-    assert.expect(4)
-    var done = assert.async()
-    var accordionHTML = '<div id="accordion">' +
-        '<div class="item">' +
-        '<a id="linkTrigger" data-toggle="collapse" href="#collapseOne" aria-expanded="false" aria-controls="collapseOne"></a>' +
-        '<div id="collapseOne" class="collapse" role="tabpanel" aria-labelledby="headingThree" data-parent="#accordion"></div>' +
-        '</div>' +
-        '<div class="item">' +
-        '<a id="linkTriggerTwo" data-toggle="collapse" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo"></a>' +
-        '<div id="collapseTwo" class="collapse show" role="tabpanel" aria-labelledby="headingTwo" data-parent="#accordion"></div>' +
-        '</div>' +
-        '</div>'
-
-    $(accordionHTML).appendTo('#qunit-fixture')
-    var $trigger = $('#linkTrigger')
-    var $triggerTwo = $('#linkTriggerTwo')
-    var $collapseOne = $('#collapseOne')
-    var $collapseTwo = $('#collapseTwo')
-    $collapseOne.on('shown.bs.collapse', function () {
-      assert.ok($collapseOne.hasClass('show'), '#collapseOne is shown')
-      assert.ok(!$collapseTwo.hasClass('show'), '#collapseTwo is not shown')
-      $collapseTwo.on('shown.bs.collapse', function () {
-        assert.ok(!$collapseOne.hasClass('show'), '#collapseOne is not shown')
-        assert.ok($collapseTwo.hasClass('show'), '#collapseTwo is shown')
-        done()
-      })
-      $triggerTwo[0].dispatchEvent(new Event('click'))
-    })
-    $trigger[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should allow accordion to contain nested elements', function (assert) {
-    assert.expect(4)
-    var done = assert.async()
-    var accordionHTML = '<div id="accordion">' +
-        '<div class="row">' +
-        '<div class="col-lg-6">' +
-        '<div class="item">' +
-        '<a id="linkTrigger" data-toggle="collapse" href="#collapseOne" aria-expanded="false" aria-controls="collapseOne"></a>' +
-        '<div id="collapseOne" class="collapse" role="tabpanel" aria-labelledby="headingThree" data-parent="#accordion"></div>' +
-        '</div>' +
-        '</div>' +
-        '<div class="col-lg-6">' +
-        '<div class="item">' +
-        '<a id="linkTriggerTwo" data-toggle="collapse" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo"></a>' +
-        '<div id="collapseTwo" class="collapse show" role="tabpanel" aria-labelledby="headingTwo" data-parent="#accordion"></div>' +
-        '</div>' +
-        '</div>' +
-        '</div>' +
-        '</div>'
-
-    $(accordionHTML).appendTo('#qunit-fixture')
-    var $trigger = $('#linkTrigger')
-    var $triggerTwo = $('#linkTriggerTwo')
-    var $collapseOne = $('#collapseOne')
-    var $collapseTwo = $('#collapseTwo')
-
-    $collapseOne.on('shown.bs.collapse', function () {
-      assert.ok($collapseOne.hasClass('show'), '#collapseOne is shown')
-      assert.ok(!$collapseTwo.hasClass('show'), '#collapseTwo is not shown')
-
-      $collapseTwo.on('shown.bs.collapse', function () {
-        assert.ok(!$collapseOne.hasClass('show'), '#collapseOne is not shown')
-        assert.ok($collapseTwo.hasClass('show'), '#collapseTwo is shown')
-        done()
-      })
-      $triggerTwo[0].dispatchEvent(new Event('click'))
-    })
-    $trigger[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should allow accordion to target multiple elements', function (assert) {
-    assert.expect(8)
-    var done = assert.async()
-    var accordionHTML = '<div id="accordion">' +
-      '<a id="linkTriggerOne" data-toggle="collapse" data-target=".collapseOne" href="#" aria-expanded="false" aria-controls="collapseOne"></a>' +
-      '<a id="linkTriggerTwo" data-toggle="collapse" data-target=".collapseTwo" href="#" aria-expanded="false" aria-controls="collapseTwo"></a>' +
-      '<div id="collapseOneOne" class="collapse collapseOne" role="tabpanel" data-parent="#accordion"></div>' +
-      '<div id="collapseOneTwo" class="collapse collapseOne" role="tabpanel" data-parent="#accordion"></div>' +
-      '<div id="collapseTwoOne" class="collapse collapseTwo" role="tabpanel" data-parent="#accordion"></div>' +
-      '<div id="collapseTwoTwo" class="collapse collapseTwo" role="tabpanel" data-parent="#accordion"></div>' +
-      '</div>'
-
-    $(accordionHTML).appendTo('#qunit-fixture')
-    var $trigger = $('#linkTriggerOne')
-    var $triggerTwo = $('#linkTriggerTwo')
-    var $collapseOneOne = $('#collapseOneOne')
-    var $collapseOneTwo = $('#collapseOneTwo')
-    var $collapseTwoOne = $('#collapseTwoOne')
-    var $collapseTwoTwo = $('#collapseTwoTwo')
-    var collapsedElements = {
-      one: false,
-      two: false
-    }
-
-    function firstTest() {
-      assert.ok($collapseOneOne.hasClass('show'), '#collapseOneOne is shown')
-      assert.ok($collapseOneTwo.hasClass('show'), '#collapseOneTwo is shown')
-      assert.ok(!$collapseTwoOne.hasClass('show'), '#collapseTwoOne is not shown')
-      assert.ok(!$collapseTwoTwo.hasClass('show'), '#collapseTwoTwo is not shown')
-      $triggerTwo[0].dispatchEvent(new Event('click'))
-    }
-
-    function secondTest() {
-      assert.ok(!$collapseOneOne.hasClass('show'), '#collapseOneOne is not shown')
-      assert.ok(!$collapseOneTwo.hasClass('show'), '#collapseOneTwo is not shown')
-      assert.ok($collapseTwoOne.hasClass('show'), '#collapseTwoOne is shown')
-      assert.ok($collapseTwoTwo.hasClass('show'), '#collapseTwoTwo is shown')
-      done()
-    }
-
-    $collapseOneOne.on('shown.bs.collapse', function () {
-      if (collapsedElements.one) {
-        firstTest()
-      } else {
-        collapsedElements.one = true
-      }
-    })
-
-    $collapseOneTwo.on('shown.bs.collapse', function () {
-      if (collapsedElements.one) {
-        firstTest()
-      } else {
-        collapsedElements.one = true
-      }
-    })
-
-    $collapseTwoOne.on('shown.bs.collapse', function () {
-      if (collapsedElements.two) {
-        secondTest()
-      } else {
-        collapsedElements.two = true
-      }
-    })
-
-    $collapseTwoTwo.on('shown.bs.collapse', function () {
-      if (collapsedElements.two) {
-        secondTest()
-      } else {
-        collapsedElements.two = true
-      }
-    })
-
-    $trigger[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should collapse accordion children but not nested accordion children', function (assert) {
-    assert.expect(9)
-    var done = assert.async()
-    $('<div id="accordion">' +
-        '<div class="item">' +
-        '<a id="linkTrigger" data-toggle="collapse" href="#collapseOne" aria-expanded="false" aria-controls="collapseOne"></a>' +
-        '<div id="collapseOne" data-parent="#accordion" class="collapse" role="tabpanel" aria-labelledby="headingThree">' +
-        '<div id="nestedAccordion">' +
-        '<div class="item">' +
-        '<a id="nestedLinkTrigger" data-toggle="collapse" href="#nestedCollapseOne" aria-expanded="false" aria-controls="nestedCollapseOne"></a>' +
-        '<div id="nestedCollapseOne" data-parent="#nestedAccordion" class="collapse" role="tabpanel" aria-labelledby="headingThree">' +
-        '</div>' +
-        '</div>' +
-        '</div>' +
-        '</div>' +
-        '</div>' +
-        '<div class="item">' +
-        '<a id="linkTriggerTwo" data-toggle="collapse" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo"></a>' +
-        '<div id="collapseTwo" data-parent="#accordion" class="collapse show" role="tabpanel" aria-labelledby="headingTwo"></div>' +
-        '</div>' +
-        '</div>').appendTo('#qunit-fixture')
-    var $trigger = $('#linkTrigger')
-    var $triggerTwo = $('#linkTriggerTwo')
-    var $nestedTrigger = $('#nestedLinkTrigger')
-    var $collapseOne = $('#collapseOne')
-    var $collapseTwo = $('#collapseTwo')
-    var $nestedCollapseOne = $('#nestedCollapseOne')
-
-    function handlerCollapseOne() {
-      assert.ok($collapseOne.hasClass('show'), '#collapseOne is shown')
-      assert.ok(!$collapseTwo.hasClass('show'), '#collapseTwo is not shown')
-      assert.ok(!$('#nestedCollapseOne').hasClass('show'), '#nestedCollapseOne is not shown')
-
-      $nestedCollapseOne[0].addEventListener('shown.bs.collapse', handlerNestedCollapseOne)
-      $nestedTrigger[0].dispatchEvent(new Event('click'))
-      $collapseOne[0].removeEventListener('shown.bs.collapse', handlerCollapseOne)
-    }
-
-    function handlerNestedCollapseOne() {
-      assert.ok($collapseOne.hasClass('show'), '#collapseOne is shown')
-      assert.ok(!$collapseTwo.hasClass('show'), '#collapseTwo is not shown')
-      assert.ok($nestedCollapseOne.hasClass('show'), '#nestedCollapseOne is shown')
-
-      $collapseTwo[0].addEventListener('shown.bs.collapse', function () {
-        assert.ok(!$collapseOne.hasClass('show'), '#collapseOne is not shown')
-        assert.ok($collapseTwo.hasClass('show'), '#collapseTwo is shown')
-        assert.ok($nestedCollapseOne.hasClass('show'), '#nestedCollapseOne is shown')
-        done()
-      })
-      $triggerTwo[0].dispatchEvent(new Event('click'))
-      $nestedCollapseOne[0].removeEventListener('shown.bs.collapse', handlerNestedCollapseOne)
-    }
-
-    $collapseOne[0].addEventListener('shown.bs.collapse', handlerCollapseOne)
-    $trigger[0].dispatchEvent(new Event('click'))
-  })
-
-  QUnit.test('should not prevent event for input', function (assert) {
-    assert.expect(3)
-    var done = assert.async()
-    var $target = $('<input type="checkbox" data-toggle="collapse" data-target="#collapsediv1" />').appendTo('#qunit-fixture')
-    var $collapse = $('<div id="collapsediv1"/>').appendTo('#qunit-fixture')
-
-    $collapse[0].addEventListener('shown.bs.collapse', function () {
-      assert.ok($collapse.hasClass('show'))
-      assert.ok($target.attr('aria-expanded') === 'true')
-      assert.ok($target.prop('checked'))
-      done()
-    })
-
-    $target.trigger($.Event('click'))
-  })
-
-  QUnit.test('should add "collapsed" class to triggers only when all the targeted collapse are hidden', function (assert) {
-    assert.expect(9)
-    var done = assert.async()
-
-    var $trigger1 = $('<a role="button" data-toggle="collapse" href="#test1"/>').appendTo('#qunit-fixture')
-    var $trigger2 = $('<a role="button" data-toggle="collapse" href="#test2"/>').appendTo('#qunit-fixture')
-    var $trigger3 = $('<a role="button" data-toggle="collapse" href=".multi"/>').appendTo('#qunit-fixture')
-
-    var $target1 = $('<div id="test1" class="multi"/>').appendTo('#qunit-fixture')
-    var $target2 = $('<div id="test2" class="multi"/>').appendTo('#qunit-fixture')
-
-    $target2.one('shown.bs.collapse', function () {
-      assert.ok(!$trigger1.hasClass('collapsed'), 'trigger1 does not have collapsed class')
-      assert.ok(!$trigger2.hasClass('collapsed'), 'trigger2 does not have collapsed class')
-      assert.ok(!$trigger3.hasClass('collapsed'), 'trigger3 does not have collapsed class')
-      $target2.one('hidden.bs.collapse', function () {
-        assert.ok(!$trigger1.hasClass('collapsed'), 'trigger1 does not have collapsed class')
-        assert.ok($trigger2.hasClass('collapsed'), 'trigger2 has collapsed class')
-        assert.ok(!$trigger3.hasClass('collapsed'), 'trigger3 does not have collapsed class')
-        $target1.one('hidden.bs.collapse', function () {
-          assert.ok($trigger1.hasClass('collapsed'), 'trigger1 has collapsed class')
-          assert.ok($trigger2.hasClass('collapsed'), 'trigger2 has collapsed class')
-          assert.ok($trigger3.hasClass('collapsed'), 'trigger3 has collapsed class')
-          done()
-        })
-        $trigger1[0].click()
-      })
-      $trigger2[0].click()
-    })
-    $trigger3[0].click()
-  })
-
-  QUnit.test('should set aria-expanded="true" to triggers targeting shown collapse and aria-expanded="false" only when all the targeted collapses are shown', function (assert) {
-    assert.expect(9)
-    var done = assert.async()
-
-    var $trigger1 = $('<a role="button" data-toggle="collapse" href="#test1"/>').appendTo('#qunit-fixture')
-    var $trigger2 = $('<a role="button" data-toggle="collapse" href="#test2"/>').appendTo('#qunit-fixture')
-    var $trigger3 = $('<a role="button" data-toggle="collapse" href=".multi"/>').appendTo('#qunit-fixture')
-
-    var $target1 = $('<div id="test1" class="multi collapse"/>').appendTo('#qunit-fixture')
-    var $target2 = $('<div id="test2" class="multi collapse"/>').appendTo('#qunit-fixture')
-
-    $target2.one('shown.bs.collapse', function () {
-      assert.strictEqual($trigger1.attr('aria-expanded'), 'true', 'aria-expanded on trigger1 is "true"')
-      assert.strictEqual($trigger2.attr('aria-expanded'), 'true', 'aria-expanded on trigger2 is "true"')
-      assert.strictEqual($trigger3.attr('aria-expanded'), 'true', 'aria-expanded on trigger3 is "true"')
-      $target2.one('hidden.bs.collapse', function () {
-        assert.strictEqual($trigger1.attr('aria-expanded'), 'true', 'aria-expanded on trigger1 is "true"')
-        assert.strictEqual($trigger2.attr('aria-expanded'), 'false', 'aria-expanded on trigger2 is "false"')
-        assert.strictEqual($trigger3.attr('aria-expanded'), 'true', 'aria-expanded on trigger3 is "true"')
-        $target1.one('hidden.bs.collapse', function () {
-          assert.strictEqual($trigger1.attr('aria-expanded'), 'false', 'aria-expanded on trigger1 is "fasle"')
-          assert.strictEqual($trigger2.attr('aria-expanded'), 'false', 'aria-expanded on trigger2 is "false"')
-          assert.strictEqual($trigger3.attr('aria-expanded'), 'false', 'aria-expanded on trigger3 is "false"')
-          done()
-        })
-        $trigger1[0].click()
-      })
-      $trigger2[0].click()
-    })
-    $trigger3[0].click()
-  })
-
-  QUnit.test('should not prevent interactions inside the collapse element', function (assert) {
-    assert.expect(2)
-    var done = assert.async()
-
-    var $target = $('<input type="checkbox" data-toggle="collapse" data-target="#collapsediv1" />').appendTo('#qunit-fixture')
-    var htmlCollapse =
-      '<div id="collapsediv1" class="collapse">' +
-      ' <input type="checkbox" id="testCheckbox" />' +
-      '</div>'
-    var $collapse = $(htmlCollapse).appendTo('#qunit-fixture')
-
-    $collapse[0].addEventListener('shown.bs.collapse', function () {
-      assert.ok($target.prop('checked'), '$trigger is checked')
-      var $testCheckbox = $('#testCheckbox')
-      $testCheckbox.trigger($.Event('click'))
-      setTimeout(function () {
-        assert.ok($testCheckbox.prop('checked'), '$testCheckbox is checked too')
-        done()
-      }, 5)
-    })
-    $target.trigger($.Event('click'))
-  })
-
-  QUnit.test('should allow jquery object in parent config', function (assert) {
-    assert.expect(1)
-    var html =
-    '<div class="my-collapse">' +
-    '  <div class="item">' +
-    '    <a data-toggle="collapse" href="#">Toggle item</a>' +
-    '    <div class="collapse">Lorem ipsum</div>' +
-    '  </div>' +
-    '</div>'
-
-    $(html).appendTo('#qunit-fixture')
-    try {
-      $('[data-toggle="collapse"]').bootstrapCollapse({
-        parent: $('.my-collapse')
-      })
-      assert.ok(true, 'collapse correctly created')
-    } catch (error) {
-      assert.ok(false, 'collapse not created')
-    }
-  })
-
-  QUnit.test('should allow DOM object in parent config', function (assert) {
-    assert.expect(1)
-    var html =
-    '<div class="my-collapse">' +
-    '  <div class="item">' +
-    '    <a data-toggle="collapse" href="#">Toggle item</a>' +
-    '    <div class="collapse">Lorem ipsum</div>' +
-    '  </div>' +
-    '</div>'
-
-    $(html).appendTo('#qunit-fixture')
-    try {
-      $('[data-toggle="collapse"]').bootstrapCollapse({
-        parent: $('.my-collapse')[0]
-      })
-      assert.ok(true, 'collapse correctly created')
-    } catch (error) {
-      assert.ok(false, 'collapse not created')
-    }
-  })
-
-  QUnit.test('should find collapse children if they have collapse class too not only data-parent', function (assert) {
-    assert.expect(2)
-    var done = assert.async()
-
-    var html =
-    '<div class="my-collapse">' +
-    '  <div class="item">' +
-    '    <a data-toggle="collapse" href="#">Toggle item 1</a>' +
-    '    <div id="collapse1" class="collapse show">Lorem ipsum 1</div>' +
-    '  </div>' +
-    '  <div class="item">' +
-    '    <a id="triggerCollapse2" data-toggle="collapse" href="#">Toggle item 2</a>' +
-    '    <div id="collapse2" class="collapse">Lorem ipsum 2</div>' +
-    '  </div>' +
-    '</div>'
-
-    $(html).appendTo('#qunit-fixture')
-
-    var $parent = $('.my-collapse')
-    var $collapse2 = $('#collapse2')
-    $parent.find('.collapse').bootstrapCollapse({
-      parent: $parent,
-      toggle: false
-    })
-
-    $collapse2.on('shown.bs.collapse', function () {
-      assert.ok($collapse2.hasClass('show'))
-      assert.ok(!$('#collapse1').hasClass('show'))
-      done()
-    })
-
-    $collapse2.bootstrapCollapse('toggle')
-  })
-
-  QUnit.test('should return the version', function (assert) {
-    assert.expect(1)
-    assert.strictEqual(typeof Collapse.VERSION, 'string')
-  })
-})