Merge branch 'twbs:main' into mainHEADmain

1 files changed, 626 insertions, 585 deletions

diff --git a/js/tests/unit/collapse.spec.js b/js/tests/unit/collapse.spec.js
index 89d20a6d8..58c536752 100644
--- a/js/tests/unit/collapse.spec.js
+++ b/js/tests/unit/collapse.spec.js
@@ -1,6 +1,6 @@
-import Collapse from '../../src/collapse'
-import EventHandler from '../../src/dom/event-handler'
-import { clearFixture, getFixture, jQueryMock } from '../helpers/fixture'
+import Collapse from '../../src/collapse.js'
+import EventHandler from '../../src/dom/event-handler.js'
+import { clearFixture, getFixture, jQueryMock } from '../helpers/fixture.js'
 
 describe('Collapse', () => {
   let fixtureEl
@@ -112,11 +112,11 @@ describe('Collapse', () => {
       const collapseEl = fixtureEl.querySelector('div')
       const collapse = new Collapse(collapseEl)
 
-      spyOn(collapse, 'show')
+      const spy = spyOn(collapse, 'show')
 
       collapse.toggle()
 
-      expect(collapse.show).toHaveBeenCalled()
+      expect(spy).toHaveBeenCalled()
     })
 
     it('should call hide method if show class is present', () => {
@@ -127,44 +127,46 @@ describe('Collapse', () => {
         toggle: false
       })
 
-      spyOn(collapse, 'hide')
+      const spy = spyOn(collapse, 'hide')
 
       collapse.toggle()
 
-      expect(collapse.hide).toHaveBeenCalled()
+      expect(spy).toHaveBeenCalled()
     })
 
-    it('should find collapse children if they have collapse class too not only data-bs-parent', done => {
-      fixtureEl.innerHTML = [
-        '<div class="my-collapse">',
-        '  <div class="item">',
-        '    <a data-bs-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-bs-toggle="collapse" href="#">Toggle item 2</a>',
-        '    <div id="collapse2" class="collapse">Lorem ipsum 2</div>',
-        '  </div>',
-        '</div>'
-      ].join('')
-
-      const parent = fixtureEl.querySelector('.my-collapse')
-      const collapseEl1 = fixtureEl.querySelector('#collapse1')
-      const collapseEl2 = fixtureEl.querySelector('#collapse2')
-
-      const collapseList = [].concat(...fixtureEl.querySelectorAll('.collapse'))
-        .map(el => new Collapse(el, {
-          parent,
-          toggle: false
-        }))
+    it('should find collapse children if they have collapse class too not only data-bs-parent', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = [
+          '<div class="my-collapse">',
+          '  <div class="item">',
+          '    <a data-bs-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-bs-toggle="collapse" href="#">Toggle item 2</a>',
+          '    <div id="collapse2" class="collapse">Lorem ipsum 2</div>',
+          '  </div>',
+          '</div>'
+        ].join('')
+
+        const parent = fixtureEl.querySelector('.my-collapse')
+        const collapseEl1 = fixtureEl.querySelector('#collapse1')
+        const collapseEl2 = fixtureEl.querySelector('#collapse2')
+
+        const collapseList = [].concat(...fixtureEl.querySelectorAll('.collapse'))
+          .map(el => new Collapse(el, {
+            parent,
+            toggle: false
+          }))
+
+        collapseEl2.addEventListener('shown.bs.collapse', () => {
+          expect(collapseEl2).toHaveClass('show')
+          expect(collapseEl1).not.toHaveClass('show')
+          resolve()
+        })
 
-      collapseEl2.addEventListener('shown.bs.collapse', () => {
-        expect(collapseEl2.classList.contains('show')).toEqual(true)
-        expect(collapseEl1.classList.contains('show')).toEqual(false)
-        done()
+        collapseList[1].toggle()
       })
-
-      collapseList[1].toggle()
     })
   })
 
@@ -172,7 +174,7 @@ describe('Collapse', () => {
     it('should do nothing if is transitioning', () => {
       fixtureEl.innerHTML = '<div></div>'
 
-      spyOn(EventHandler, 'trigger')
+      const spy = spyOn(EventHandler, 'trigger')
 
       const collapseEl = fixtureEl.querySelector('div')
       const collapse = new Collapse(collapseEl, {
@@ -182,13 +184,13 @@ describe('Collapse', () => {
       collapse._isTransitioning = true
       collapse.show()
 
-      expect(EventHandler.trigger).not.toHaveBeenCalled()
+      expect(spy).not.toHaveBeenCalled()
     })
 
     it('should do nothing if already shown', () => {
       fixtureEl.innerHTML = '<div class="show"></div>'
 
-      spyOn(EventHandler, 'trigger')
+      const spy = spyOn(EventHandler, 'trigger')
 
       const collapseEl = fixtureEl.querySelector('div')
       const collapse = new Collapse(collapseEl, {
@@ -197,205 +199,218 @@ describe('Collapse', () => {
 
       collapse.show()
 
-      expect(EventHandler.trigger).not.toHaveBeenCalled()
+      expect(spy).not.toHaveBeenCalled()
     })
 
-    it('should show a collapsed element', done => {
-      fixtureEl.innerHTML = '<div class="collapse" style="height: 0px;"></div>'
+    it('should show a collapsed element', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<div class="collapse" style="height: 0px;"></div>'
 
-      const collapseEl = fixtureEl.querySelector('div')
-      const collapse = new Collapse(collapseEl, {
-        toggle: false
-      })
+        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()
-      })
+        collapseEl.addEventListener('show.bs.collapse', () => {
+          expect(collapseEl.style.height).toEqual('0px')
+        })
+        collapseEl.addEventListener('shown.bs.collapse', () => {
+          expect(collapseEl).toHaveClass('show')
+          expect(collapseEl.style.height).toEqual('')
+          resolve()
+        })
 
-      collapse.show()
+        collapse.show()
+      })
     })
 
-    it('should show a collapsed element on width', done => {
-      fixtureEl.innerHTML = '<div class="collapse collapse-horizontal" style="width: 0px;"></div>'
+    it('should show a collapsed element on width', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<div class="collapse collapse-horizontal" style="width: 0px;"></div>'
 
-      const collapseEl = fixtureEl.querySelector('div')
-      const collapse = new Collapse(collapseEl, {
-        toggle: false
-      })
+        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()
-      })
+        collapseEl.addEventListener('show.bs.collapse', () => {
+          expect(collapseEl.style.width).toEqual('0px')
+        })
+        collapseEl.addEventListener('shown.bs.collapse', () => {
+          expect(collapseEl).toHaveClass('show')
+          expect(collapseEl.style.width).toEqual('')
+          resolve()
+        })
 
-      collapse.show()
+        collapse.show()
+      })
     })
 
-    it('should collapse only the first collapse', done => {
-      fixtureEl.innerHTML = [
-        '<div class="card" id="accordion1">',
-        '  <div id="collapse1" class="collapse"></div>',
-        '</div>',
-        '<div class="card" id="accordion2">',
-        '  <div id="collapse2" class="collapse show"></div>',
-        '</div>'
-      ].join('')
+    it('should collapse only the first collapse', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = [
+          '<div class="card" id="accordion1">',
+          '  <div id="collapse1" class="collapse"></div>',
+          '</div>',
+          '<div class="card" id="accordion2">',
+          '  <div id="collapse2" class="collapse show"></div>',
+          '</div>'
+        ].join('')
+
+        const el1 = fixtureEl.querySelector('#collapse1')
+        const el2 = fixtureEl.querySelector('#collapse2')
+        const collapse = new Collapse(el1, {
+          toggle: false
+        })
 
-      const el1 = fixtureEl.querySelector('#collapse1')
-      const el2 = fixtureEl.querySelector('#collapse2')
-      const collapse = new Collapse(el1, {
-        toggle: false
-      })
+        el1.addEventListener('shown.bs.collapse', () => {
+          expect(el1).toHaveClass('show')
+          expect(el2).toHaveClass('show')
+          resolve()
+        })
 
-      el1.addEventListener('shown.bs.collapse', () => {
-        expect(el1.classList.contains('show')).toEqual(true)
-        expect(el2.classList.contains('show')).toEqual(true)
-        done()
+        collapse.show()
       })
-
-      collapse.show()
     })
 
-    it('should be able to handle toggling of other children siblings', done => {
-      fixtureEl.innerHTML = [
-        '<div id="parentGroup" class="accordion">',
-        '   <div id="parentHeader" class="accordion-header">',
-        '      <button data-bs-target="#parentContent" data-bs-toggle="collapse" role="button" class="accordion-toggle">Parent</button>',
-        '   </div>',
-        '   <div id="parentContent" class="accordion-collapse collapse" aria-labelledby="parentHeader" data-bs-parent="#parentGroup">',
-        '      <div class="accordion-body">',
-        '         <div id="childGroup" class="accordion">',
-        '            <div class="accordion-item">',
-        '               <div id="childHeader1" class="accordion-header">',
-        '                  <button data-bs-target="#childContent1" data-bs-toggle="collapse" role="button" class="accordion-toggle">Child 1</button>',
-        '               </div>',
-        '               <div id="childContent1" class="accordion-collapse collapse" aria-labelledby="childHeader1" data-bs-parent="#childGroup">',
-        '                  <div>content</div>',
-        '               </div>',
-        '            </div>',
-        '            <div class="accordion-item">',
-        '               <div id="childHeader2" class="accordion-header">',
-        '                  <button data-bs-target="#childContent2" data-bs-toggle="collapse" role="button" class="accordion-toggle">Child 2</button>',
-        '               </div>',
-        '               <div id="childContent2" class="accordion-collapse collapse" aria-labelledby="childHeader2" data-bs-parent="#childGroup">',
-        '                  <div>content</div>',
-        '               </div>',
-        '            </div>',
-        '         </div>',
-        '      </div>',
-        '   </div>',
-        '</div>'
-      ].join('')
-
-      const el = selector => fixtureEl.querySelector(selector)
-
-      const parentBtn = el('[data-bs-target="#parentContent"]')
-      const childBtn1 = el('[data-bs-target="#childContent1"]')
-      const childBtn2 = el('[data-bs-target="#childContent2"]')
-
-      const parentCollapseEl = el('#parentContent')
-      const childCollapseEl1 = el('#childContent1')
-      const childCollapseEl2 = el('#childContent2')
+    it('should be able to handle toggling of other children siblings', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = [
+          '<div id="parentGroup" class="accordion">',
+          '  <div class="accordion-header">',
+          '    <button data-bs-target="#parentContent" data-bs-toggle="collapse" class="accordion-toggle">Parent</button>',
+          '  </div>',
+          '  <div id="parentContent" class="accordion-collapse collapse" data-bs-parent="#parentGroup">',
+          '    <div class="accordion-body">',
+          '      <div id="childGroup" class="accordion">',
+          '        <div class="accordion-item">',
+          '          <div class="accordion-header">',
+          '            <button data-bs-target="#childContent1" data-bs-toggle="collapse" class="accordion-toggle">Child 1</button>',
+          '          </div>',
+          '          <div id="childContent1" class="accordion-collapse collapse" data-bs-parent="#childGroup">',
+          '            <div>content</div>',
+          '          </div>',
+          '        </div>',
+          '        <div class="accordion-item">',
+          '          <div class="accordion-header">',
+          '            <button data-bs-target="#childContent2" data-bs-toggle="collapse" class="accordion-toggle">Child 2</button>',
+          '          </div>',
+          '          <div id="childContent2" class="accordion-collapse collapse" data-bs-parent="#childGroup">',
+          '            <div>content</div>',
+          '          </div>',
+          '        </div>',
+          '      </div>',
+          '    </div>',
+          '  </div>',
+          '</div>'
+        ].join('')
+
+        const el = selector => fixtureEl.querySelector(selector)
+
+        const parentBtn = el('[data-bs-target="#parentContent"]')
+        const childBtn1 = el('[data-bs-target="#childContent1"]')
+        const childBtn2 = el('[data-bs-target="#childContent2"]')
+
+        const parentCollapseEl = el('#parentContent')
+        const childCollapseEl1 = el('#childContent1')
+        const childCollapseEl2 = el('#childContent2')
+
+        parentCollapseEl.addEventListener('shown.bs.collapse', () => {
+          expect(parentCollapseEl).toHaveClass('show')
+          childBtn1.click()
+        })
+        childCollapseEl1.addEventListener('shown.bs.collapse', () => {
+          expect(childCollapseEl1).toHaveClass('show')
+          childBtn2.click()
+        })
+        childCollapseEl2.addEventListener('shown.bs.collapse', () => {
+          expect(childCollapseEl2).toHaveClass('show')
+          expect(childCollapseEl1).not.toHaveClass('show')
+          resolve()
+        })
 
-      parentCollapseEl.addEventListener('shown.bs.collapse', () => {
-        expect(parentCollapseEl.classList.contains('show')).toEqual(true)
-        childBtn1.click()
+        parentBtn.click()
       })
-      childCollapseEl1.addEventListener('shown.bs.collapse', () => {
-        expect(childCollapseEl1.classList.contains('show')).toEqual(true)
-        childBtn2.click()
-      })
-      childCollapseEl2.addEventListener('shown.bs.collapse', () => {
-        expect(childCollapseEl2.classList.contains('show')).toEqual(true)
-        expect(childCollapseEl1.classList.contains('show')).toEqual(false)
-        done()
-      })
-
-      parentBtn.click()
     })
-    it('should not change tab tabpanels descendants on accordion', done => {
-      fixtureEl.innerHTML = [
-        '<div class="accordion" id="accordionExample">',
-        '      <div class="accordion-item">',
-        '        <h2 class="accordion-header" id="headingOne">',
-        '          <button class="accordion-button" type="button" data-bs-toggle="collapse" data-bs-target="#collapseOne" aria-expanded="true" aria-controls="collapseOne">',
-        '            Accordion Item #1',
-        '          </button>',
-        '        </h2>',
-        '        <div id="collapseOne" class="accordion-collapse collapse show" aria-labelledby="headingOne" data-bs-parent="#accordionExample">',
-        '          <div class="accordion-body">',
-        '            <nav>',
-        '              <div class="nav nav-tabs" id="nav-tab" role="tablist">',
-        '                <button class="nav-link active" id="nav-home-tab" data-bs-toggle="tab" data-bs-target="#nav-home" type="button" role="tab" aria-controls="nav-home" aria-selected="true">Home</button>',
-        '                <button class="nav-link" id="nav-profile-tab" data-bs-toggle="tab" data-bs-target="#nav-profile" type="button" role="tab" aria-controls="nav-profile" aria-selected="false">Profile</button>',
-        '              </div>',
-        '            </nav>',
-        '            <div class="tab-content" id="nav-tabContent">',
-        '              <div class="tab-pane fade show active" id="nav-home" role="tabpanel" aria-labelledby="nav-home-tab">Home</div>',
-        '              <div class="tab-pane fade" id="nav-profile" role="tabpanel" aria-labelledby="nav-profile-tab">Profile</div>',
-        '            </div>',
-        '          </div>',
-        '        </div>',
-        '      </div>',
-        '    </div>'
-      ].join('')
 
-      const el = fixtureEl.querySelector('#collapseOne')
-      const activeTabPane = fixtureEl.querySelector('#nav-home')
-      const collapse = new Collapse(el)
-      let times = 1
+    it('should not change tab tabpanels descendants on accordion', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = [
+          '<div class="accordion" id="accordionExample">',
+          '  <div class="accordion-item">',
+          '    <h2 class="accordion-header">',
+          '      <button class="accordion-button" type="button" data-bs-toggle="collapse" data-bs-target="#collapseOne" aria-expanded="true" aria-controls="collapseOne">',
+          '        Accordion Item #1',
+          '      </button>',
+          '    </h2>',
+          '    <div id="collapseOne" class="accordion-collapse collapse show" data-bs-parent="#accordionExample">',
+          '      <div class="accordion-body">',
+          '        <nav>',
+          '          <div class="nav nav-tabs" id="nav-tab" role="tablist">',
+          '            <button class="nav-link active" id="nav-home-tab" data-bs-toggle="tab" data-bs-target="#nav-home" type="button" role="tab" aria-controls="nav-home" aria-selected="true">Home</button>',
+          '            <button class="nav-link" id="nav-profile-tab" data-bs-toggle="tab" data-bs-target="#nav-profile" type="button" role="tab" aria-controls="nav-profile" aria-selected="false">Profile</button>',
+          '          </div>',
+          '        </nav>',
+          '        <div class="tab-content" id="nav-tabContent">',
+          '          <div class="tab-pane fade show active" id="nav-home" role="tabpanel" aria-labelledby="nav-home-tab">Home</div>',
+          '          <div class="tab-pane fade" id="nav-profile" role="tabpanel" aria-labelledby="nav-profile-tab">Profile</div>',
+          '        </div>',
+          '      </div>',
+          '    </div>',
+          '  </div>',
+          '</div>'
+        ].join('')
+
+        const el = fixtureEl.querySelector('#collapseOne')
+        const activeTabPane = fixtureEl.querySelector('#nav-home')
+        const collapse = new Collapse(el)
+        let times = 1
+
+        el.addEventListener('hidden.bs.collapse', () => {
+          collapse.show()
+        })
 
-      el.addEventListener('hidden.bs.collapse', () => {
-        collapse.show()
-      })
+        el.addEventListener('shown.bs.collapse', () => {
+          expect(activeTabPane).toHaveClass('show')
+          times++
+          if (times === 2) {
+            resolve()
+          }
 
-      el.addEventListener('shown.bs.collapse', () => {
-        expect(activeTabPane.classList.contains('show')).toEqual(true)
-        times++
-        if (times === 2) {
-          done()
-        }
+          collapse.hide()
+        })
 
-        collapse.hide()
+        collapse.show()
       })
-
-      collapse.show()
     })
 
-    it('should not fire shown when show is prevented', done => {
-      fixtureEl.innerHTML = '<div class="collapse"></div>'
+    it('should not fire shown when show is prevented', () => {
+      return new Promise((resolve, reject) => {
+        fixtureEl.innerHTML = '<div class="collapse"></div>'
 
-      const collapseEl = fixtureEl.querySelector('div')
-      const collapse = new Collapse(collapseEl, {
-        toggle: false
-      })
+        const collapseEl = fixtureEl.querySelector('div')
+        const collapse = new Collapse(collapseEl, {
+          toggle: false
+        })
 
-      const expectEnd = () => {
-        setTimeout(() => {
-          expect().nothing()
-          done()
-        }, 10)
-      }
+        const expectEnd = () => {
+          setTimeout(() => {
+            expect().nothing()
+            resolve()
+          }, 10)
+        }
 
-      collapseEl.addEventListener('show.bs.collapse', event => {
-        event.preventDefault()
-        expectEnd()
-      })
+        collapseEl.addEventListener('show.bs.collapse', event => {
+          event.preventDefault()
+          expectEnd()
+        })
 
-      collapseEl.addEventListener('shown.bs.collapse', () => {
-        throw new Error('should not fire shown event')
-      })
+        collapseEl.addEventListener('shown.bs.collapse', () => {
+          reject(new Error('should not fire shown event'))
+        })
 
-      collapse.show()
+        collapse.show()
+      })
     })
   })
 
@@ -403,7 +418,7 @@ describe('Collapse', () => {
     it('should do nothing if is transitioning', () => {
       fixtureEl.innerHTML = '<div></div>'
 
-      spyOn(EventHandler, 'trigger')
+      const spy = spyOn(EventHandler, 'trigger')
 
       const collapseEl = fixtureEl.querySelector('div')
       const collapse = new Collapse(collapseEl, {
@@ -413,13 +428,13 @@ describe('Collapse', () => {
       collapse._isTransitioning = true
       collapse.hide()
 
-      expect(EventHandler.trigger).not.toHaveBeenCalled()
+      expect(spy).not.toHaveBeenCalled()
     })
 
     it('should do nothing if already shown', () => {
       fixtureEl.innerHTML = '<div></div>'
 
-      spyOn(EventHandler, 'trigger')
+      const spy = spyOn(EventHandler, 'trigger')
 
       const collapseEl = fixtureEl.querySelector('div')
       const collapse = new Collapse(collapseEl, {
@@ -428,51 +443,55 @@ describe('Collapse', () => {
 
       collapse.hide()
 
-      expect(EventHandler.trigger).not.toHaveBeenCalled()
+      expect(spy).not.toHaveBeenCalled()
     })
 
-    it('should hide a collapsed element', done => {
-      fixtureEl.innerHTML = '<div class="collapse show"></div>'
+    it('should hide a collapsed element', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<div class="collapse show"></div>'
 
-      const collapseEl = fixtureEl.querySelector('div')
-      const collapse = new Collapse(collapseEl, {
-        toggle: false
-      })
+        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()
-      })
+        collapseEl.addEventListener('hidden.bs.collapse', () => {
+          expect(collapseEl).not.toHaveClass('show')
+          expect(collapseEl.style.height).toEqual('')
+          resolve()
+        })
 
-      collapse.hide()
+        collapse.hide()
+      })
     })
 
-    it('should not fire hidden when hide is prevented', done => {
-      fixtureEl.innerHTML = '<div class="collapse show"></div>'
+    it('should not fire hidden when hide is prevented', () => {
+      return new Promise((resolve, reject) => {
+        fixtureEl.innerHTML = '<div class="collapse show"></div>'
 
-      const collapseEl = fixtureEl.querySelector('div')
-      const collapse = new Collapse(collapseEl, {
-        toggle: false
-      })
+        const collapseEl = fixtureEl.querySelector('div')
+        const collapse = new Collapse(collapseEl, {
+          toggle: false
+        })
 
-      const expectEnd = () => {
-        setTimeout(() => {
-          expect().nothing()
-          done()
-        }, 10)
-      }
+        const expectEnd = () => {
+          setTimeout(() => {
+            expect().nothing()
+            resolve()
+          }, 10)
+        }
 
-      collapseEl.addEventListener('hide.bs.collapse', event => {
-        event.preventDefault()
-        expectEnd()
-      })
+        collapseEl.addEventListener('hide.bs.collapse', event => {
+          event.preventDefault()
+          expectEnd()
+        })
 
-      collapseEl.addEventListener('hidden.bs.collapse', () => {
-        throw new Error('should not fire hidden event')
-      })
+        collapseEl.addEventListener('hidden.bs.collapse', () => {
+          reject(new Error('should not fire hidden event'))
+        })
 
-      collapse.hide()
+        collapse.hide()
+      })
     })
   })
 
@@ -489,416 +508,438 @@ describe('Collapse', () => {
 
       collapse.dispose()
 
-      expect(Collapse.getInstance(collapseEl)).toEqual(null)
+      expect(Collapse.getInstance(collapseEl)).toBeNull()
     })
   })
 
   describe('data-api', () => {
-    it('should prevent url change if click on nested elements', done => {
-      fixtureEl.innerHTML = [
-        '<a role="button" data-bs-toggle="collapse" class="collapsed" href="#collapse">',
-        '  <span id="nested"></span>',
-        '</a>',
-        '<div id="collapse" class="collapse"></div>'
-      ].join('')
-
-      const triggerEl = fixtureEl.querySelector('a')
-      const nestedTriggerEl = fixtureEl.querySelector('#nested')
-
-      spyOn(Event.prototype, 'preventDefault').and.callThrough()
+    it('should prevent url change if click on nested elements', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = [
+          '<a role="button" data-bs-toggle="collapse" class="collapsed" href="#collapse">',
+          '  <span id="nested"></span>',
+          '</a>',
+          '<div id="collapse" class="collapse"></div>'
+        ].join('')
+
+        const triggerEl = fixtureEl.querySelector('a')
+        const nestedTriggerEl = fixtureEl.querySelector('#nested')
+
+        const spy = spyOn(Event.prototype, 'preventDefault').and.callThrough()
+
+        triggerEl.addEventListener('click', event => {
+          expect(event.target.isEqualNode(nestedTriggerEl)).toBeTrue()
+          expect(event.delegateTarget.isEqualNode(triggerEl)).toBeTrue()
+          expect(spy).toHaveBeenCalled()
+          resolve()
+        })
 
-      triggerEl.addEventListener('click', event => {
-        expect(event.target.isEqualNode(nestedTriggerEl)).toEqual(true)
-        expect(event.delegateTarget.isEqualNode(triggerEl)).toEqual(true)
-        expect(Event.prototype.preventDefault).toHaveBeenCalled()
-        done()
+        nestedTriggerEl.click()
       })
-
-      nestedTriggerEl.click()
     })
 
-    it('should show multiple collapsed elements', done => {
-      fixtureEl.innerHTML = [
-        '<a role="button" data-bs-toggle="collapse" class="collapsed" href=".multi"></a>',
-        '<div id="collapse1" class="collapse multi"></div>',
-        '<div id="collapse2" class="collapse multi"></div>'
-      ].join('')
-
-      const trigger = fixtureEl.querySelector('a')
-      const collapse1 = fixtureEl.querySelector('#collapse1')
-      const collapse2 = fixtureEl.querySelector('#collapse2')
+    it('should show multiple collapsed elements', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = [
+          '<a role="button" data-bs-toggle="collapse" class="collapsed" href=".multi"></a>',
+          '<div id="collapse1" class="collapse multi"></div>',
+          '<div id="collapse2" class="collapse multi"></div>'
+        ].join('')
+
+        const trigger = fixtureEl.querySelector('a')
+        const collapse1 = fixtureEl.querySelector('#collapse1')
+        const collapse2 = fixtureEl.querySelector('#collapse2')
+
+        collapse2.addEventListener('shown.bs.collapse', () => {
+          expect(trigger.getAttribute('aria-expanded')).toEqual('true')
+          expect(trigger).not.toHaveClass('collapsed')
+          expect(collapse1).toHaveClass('show')
+          expect(collapse1).toHaveClass('show')
+          resolve()
+        })
 
-      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()
       })
-
-      trigger.click()
     })
 
-    it('should hide multiple collapsed elements', done => {
-      fixtureEl.innerHTML = [
-        '<a role="button" data-bs-toggle="collapse" href=".multi"></a>',
-        '<div id="collapse1" class="collapse multi show"></div>',
-        '<div id="collapse2" class="collapse multi show"></div>'
-      ].join('')
-
-      const trigger = fixtureEl.querySelector('a')
-      const collapse1 = fixtureEl.querySelector('#collapse1')
-      const collapse2 = fixtureEl.querySelector('#collapse2')
+    it('should hide multiple collapsed elements', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = [
+          '<a role="button" data-bs-toggle="collapse" href=".multi"></a>',
+          '<div id="collapse1" class="collapse multi show"></div>',
+          '<div id="collapse2" class="collapse multi show"></div>'
+        ].join('')
+
+        const trigger = fixtureEl.querySelector('a')
+        const collapse1 = fixtureEl.querySelector('#collapse1')
+        const collapse2 = fixtureEl.querySelector('#collapse2')
+
+        collapse2.addEventListener('hidden.bs.collapse', () => {
+          expect(trigger.getAttribute('aria-expanded')).toEqual('false')
+          expect(trigger).toHaveClass('collapsed')
+          expect(collapse1).not.toHaveClass('show')
+          expect(collapse1).not.toHaveClass('show')
+          resolve()
+        })
 
-      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()
       })
-
-      trigger.click()
     })
 
-    it('should remove "collapsed" class from target when collapse is shown', done => {
-      fixtureEl.innerHTML = [
-        '<a id="link1" role="button" data-bs-toggle="collapse" class="collapsed" href="#" data-bs-target="#test1"></a>',
-        '<a id="link2" role="button" data-bs-toggle="collapse" class="collapsed" href="#" data-bs-target="#test1"></a>',
-        '<div id="test1"></div>'
-      ].join('')
-
-      const link1 = fixtureEl.querySelector('#link1')
-      const link2 = fixtureEl.querySelector('#link2')
-      const collapseTest1 = fixtureEl.querySelector('#test1')
+    it('should remove "collapsed" class from target when collapse is shown', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = [
+          '<a id="link1" role="button" data-bs-toggle="collapse" class="collapsed" href="#" data-bs-target="#test1"></a>',
+          '<a id="link2" role="button" data-bs-toggle="collapse" class="collapsed" href="#" data-bs-target="#test1"></a>',
+          '<div id="test1"></div>'
+        ].join('')
+
+        const link1 = fixtureEl.querySelector('#link1')
+        const link2 = fixtureEl.querySelector('#link2')
+        const collapseTest1 = fixtureEl.querySelector('#test1')
+
+        collapseTest1.addEventListener('shown.bs.collapse', () => {
+          expect(link1.getAttribute('aria-expanded')).toEqual('true')
+          expect(link2.getAttribute('aria-expanded')).toEqual('true')
+          expect(link1).not.toHaveClass('collapsed')
+          expect(link2).not.toHaveClass('collapsed')
+          resolve()
+        })
 
-      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()
       })
-
-      link1.click()
     })
 
-    it('should add "collapsed" class to target when collapse is hidden', done => {
-      fixtureEl.innerHTML = [
-        '<a id="link1" role="button" data-bs-toggle="collapse" href="#" data-bs-target="#test1"></a>',
-        '<a id="link2" role="button" data-bs-toggle="collapse" href="#" data-bs-target="#test1"></a>',
-        '<div id="test1" class="show"></div>'
-      ].join('')
-
-      const link1 = fixtureEl.querySelector('#link1')
-      const link2 = fixtureEl.querySelector('#link2')
-      const collapseTest1 = fixtureEl.querySelector('#test1')
+    it('should add "collapsed" class to target when collapse is hidden', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = [
+          '<a id="link1" role="button" data-bs-toggle="collapse" href="#" data-bs-target="#test1"></a>',
+          '<a id="link2" role="button" data-bs-toggle="collapse" href="#" data-bs-target="#test1"></a>',
+          '<div id="test1" class="show"></div>'
+        ].join('')
+
+        const link1 = fixtureEl.querySelector('#link1')
+        const link2 = fixtureEl.querySelector('#link2')
+        const collapseTest1 = fixtureEl.querySelector('#test1')
+
+        collapseTest1.addEventListener('hidden.bs.collapse', () => {
+          expect(link1.getAttribute('aria-expanded')).toEqual('false')
+          expect(link2.getAttribute('aria-expanded')).toEqual('false')
+          expect(link1).toHaveClass('collapsed')
+          expect(link2).toHaveClass('collapsed')
+          resolve()
+        })
 
-      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()
       })
-
-      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-bs-toggle="collapse" href="#collapseOne" aria-expanded="false" aria-controls="collapseOne"></a>',
-        '    <div id="collapseOne" class="collapse" role="tabpanel" aria-labelledby="headingThree" data-bs-parent="#accordion"></div>',
-        '  </div>',
-        '  <div class="item">',
-        '    <a id="linkTriggerTwo" data-bs-toggle="collapse" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo"></a>',
-        '    <div id="collapseTwo" class="collapse show" role="tabpanel" aria-labelledby="headingTwo" data-bs-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)
+    it('should allow accordion to use children other than card', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = [
+          '<div id="accordion">',
+          '  <div class="item">',
+          '    <a id="linkTrigger" data-bs-toggle="collapse" href="#collapseOne" aria-expanded="false" aria-controls="collapseOne"></a>',
+          '    <div id="collapseOne" class="collapse" role="tabpanel" data-bs-parent="#accordion"></div>',
+          '  </div>',
+          '  <div class="item">',
+          '    <a id="linkTriggerTwo" data-bs-toggle="collapse" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo"></a>',
+          '    <div id="collapseTwo" class="collapse show" role="tabpanel" data-bs-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).toHaveClass('show')
+          expect(collapseTwo).not.toHaveClass('show')
+
+          collapseTwo.addEventListener('shown.bs.collapse', () => {
+            expect(collapseOne).not.toHaveClass('show')
+            expect(collapseTwo).toHaveClass('show')
+            resolve()
+          })
 
-        collapseTwo.addEventListener('shown.bs.collapse', () => {
-          expect(collapseOne.classList.contains('show')).toEqual(false)
-          expect(collapseTwo.classList.contains('show')).toEqual(true)
-          done()
+          triggerTwo.click()
         })
 
-        triggerTwo.click()
+        trigger.click()
       })
-
-      trigger.click()
     })
 
-    it('should not prevent event for input', done => {
-      fixtureEl.innerHTML = [
-        '<input type="checkbox" data-bs-toggle="collapse" data-bs-target="#collapsediv1">',
-        '<div id="collapsediv1"></div>'
-      ].join('')
+    it('should not prevent event for input', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = [
+          '<input type="checkbox" data-bs-toggle="collapse" data-bs-target="#collapsediv1">',
+          '<div id="collapsediv1"></div>'
+        ].join('')
 
-      const target = fixtureEl.querySelector('input')
-      const collapseEl = fixtureEl.querySelector('#collapsediv1')
+        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()
-      })
+        collapseEl.addEventListener('shown.bs.collapse', () => {
+          expect(collapseEl).toHaveClass('show')
+          expect(target.checked).toBeTrue()
+          resolve()
+        })
 
-      target.click()
+        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-bs-toggle="collapse" href="#collapseOne" aria-expanded="false" aria-controls="collapseOne"></a>',
-        '        <div id="collapseOne" class="collapse" role="tabpanel" aria-labelledby="headingThree" data-bs-parent="#accordion"></div>',
-        '      </div>',
-        '    </div>',
-        '    <div class="col-lg-6">',
-        '      <div class="item">',
-        '        <a id="linkTriggerTwo" data-bs-toggle="collapse" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo"></a>',
-        '        <div id="collapseTwo" class="collapse show" role="tabpanel" aria-labelledby="headingTwo" data-bs-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')
+    it('should allow accordion to contain nested elements', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = [
+          '<div id="accordion">',
+          '  <div class="row">',
+          '    <div class="col-lg-6">',
+          '      <div class="item">',
+          '        <a id="linkTrigger" data-bs-toggle="collapse" href="#collapseOne" aria-expanded="false" aria-controls="collapseOne"></a>',
+          '        <div id="collapseOne" class="collapse" role="tabpanel" data-bs-parent="#accordion"></div>',
+          '      </div>',
+          '    </div>',
+          '    <div class="col-lg-6">',
+          '      <div class="item">',
+          '        <a id="linkTriggerTwo" data-bs-toggle="collapse" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo"></a>',
+          '        <div id="collapseTwo" class="collapse show" role="tabpanel" data-bs-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).toHaveClass('show')
+          expect(triggerEl).not.toHaveClass('collapsed')
+          expect(triggerEl.getAttribute('aria-expanded')).toEqual('true')
+
+          expect(collapseTwoEl).not.toHaveClass('show')
+          expect(triggerTwoEl).toHaveClass('collapsed')
+          expect(triggerTwoEl.getAttribute('aria-expanded')).toEqual('false')
+
+          collapseTwoEl.addEventListener('shown.bs.collapse', () => {
+            expect(collapseOneEl).not.toHaveClass('show')
+            expect(triggerEl).toHaveClass('collapsed')
+            expect(triggerEl.getAttribute('aria-expanded')).toEqual('false')
+
+            expect(collapseTwoEl).toHaveClass('show')
+            expect(triggerTwoEl).not.toHaveClass('collapsed')
+            expect(triggerTwoEl.getAttribute('aria-expanded')).toEqual('true')
+            resolve()
+          })
 
-          expect(collapseTwoEl.classList.contains('show')).toEqual(true)
-          expect(triggerTwoEl.classList.contains('collapsed')).toEqual(false)
-          expect(triggerTwoEl.getAttribute('aria-expanded')).toEqual('true')
-          done()
+          triggerTwoEl.click()
         })
 
-        triggerTwoEl.click()
+        triggerEl.click()
       })
-
-      triggerEl.click()
     })
 
-    it('should allow accordion to target multiple elements', done => {
-      fixtureEl.innerHTML = [
-        '<div id="accordion">',
-        '  <a id="linkTriggerOne" data-bs-toggle="collapse" data-bs-target=".collapseOne" href="#" aria-expanded="false" aria-controls="collapseOne"></a>',
-        '  <a id="linkTriggerTwo" data-bs-toggle="collapse" data-bs-target=".collapseTwo" href="#" aria-expanded="false" aria-controls="collapseTwo"></a>',
-        '  <div id="collapseOneOne" class="collapse collapseOne" role="tabpanel" data-bs-parent="#accordion"></div>',
-        '  <div id="collapseOneTwo" class="collapse collapseOne" role="tabpanel" data-bs-parent="#accordion"></div>',
-        '  <div id="collapseTwoOne" class="collapse collapseTwo" role="tabpanel" data-bs-parent="#accordion"></div>',
-        '  <div id="collapseTwoTwo" class="collapse collapseTwo" role="tabpanel" data-bs-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
+    it('should allow accordion to target multiple elements', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = [
+          '<div id="accordion">',
+          '  <a id="linkTriggerOne" data-bs-toggle="collapse" data-bs-target=".collapseOne" href="#" aria-expanded="false" aria-controls="collapseOne"></a>',
+          '  <a id="linkTriggerTwo" data-bs-toggle="collapse" data-bs-target=".collapseTwo" href="#" aria-expanded="false" aria-controls="collapseTwo"></a>',
+          '  <div id="collapseOneOne" class="collapse collapseOne" role="tabpanel" data-bs-parent="#accordion"></div>',
+          '  <div id="collapseOneTwo" class="collapse collapseOne" role="tabpanel" data-bs-parent="#accordion"></div>',
+          '  <div id="collapseTwoOne" class="collapse collapseTwo" role="tabpanel" data-bs-parent="#accordion"></div>',
+          '  <div id="collapseTwoTwo" class="collapse collapseTwo" role="tabpanel" data-bs-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
         }
-      })
 
-      collapseOneTwo.addEventListener('shown.bs.collapse', () => {
-        if (collapsedElements.one) {
-          firstTest()
-        } else {
-          collapsedElements.one = true
-        }
-      })
+        function firstTest() {
+          expect(collapseOneOne).toHaveClass('show')
+          expect(collapseOneTwo).toHaveClass('show')
 
-      collapseTwoOne.addEventListener('shown.bs.collapse', () => {
-        if (collapsedElements.two) {
-          secondTest()
-        } else {
-          collapsedElements.two = true
-        }
-      })
+          expect(collapseTwoOne).not.toHaveClass('show')
+          expect(collapseTwoTwo).not.toHaveClass('show')
 
-      collapseTwoTwo.addEventListener('shown.bs.collapse', () => {
-        if (collapsedElements.two) {
-          secondTest()
-        } else {
-          collapsedElements.two = true
+          triggerTwo.click()
         }
-      })
 
-      trigger.click()
-    })
+        function secondTest() {
+          expect(collapseOneOne).not.toHaveClass('show')
+          expect(collapseOneTwo).not.toHaveClass('show')
 
-    it('should collapse accordion children but not nested accordion children', done => {
-      fixtureEl.innerHTML = [
-        '<div id="accordion">',
-        '  <div class="item">',
-        '    <a id="linkTrigger" data-bs-toggle="collapse" href="#collapseOne" aria-expanded="false" aria-controls="collapseOne"></a>',
-        '    <div id="collapseOne" data-bs-parent="#accordion" class="collapse" role="tabpanel" aria-labelledby="headingThree">',
-        '      <div id="nestedAccordion">',
-        '        <div class="item">',
-        '          <a id="nestedLinkTrigger" data-bs-toggle="collapse" href="#nestedCollapseOne" aria-expanded="false" aria-controls="nestedCollapseOne"></a>',
-        '          <div id="nestedCollapseOne" data-bs-parent="#nestedAccordion" class="collapse" role="tabpanel" aria-labelledby="headingThree"></div>',
-        '        </div>',
-        '      </div>',
-        '    </div>',
-        '  </div>',
-        '  <div class="item">',
-        '    <a id="linkTriggerTwo" data-bs-toggle="collapse" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo"></a>',
-        '    <div id="collapseTwo" data-bs-parent="#accordion" class="collapse show" role="tabpanel" aria-labelledby="headingTwo"></div>',
-        '  </div>',
-        '</div>'
-      ].join('')
+          expect(collapseTwoOne).toHaveClass('show')
+          expect(collapseTwoTwo).toHaveClass('show')
+          resolve()
+        }
 
-      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)
-      }
+        collapseOneOne.addEventListener('shown.bs.collapse', () => {
+          if (collapsedElements.one) {
+            firstTest()
+          } else {
+            collapsedElements.one = true
+          }
+        })
 
-      function handlerNestedCollapseOne() {
-        expect(collapseOne.classList.contains('show')).toEqual(true)
-        expect(collapseTwo.classList.contains('show')).toEqual(false)
-        expect(nestedCollapseOne.classList.contains('show')).toEqual(true)
+        collapseOneTwo.addEventListener('shown.bs.collapse', () => {
+          if (collapsedElements.one) {
+            firstTest()
+          } else {
+            collapsedElements.one = 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()
+        collapseTwoOne.addEventListener('shown.bs.collapse', () => {
+          if (collapsedElements.two) {
+            secondTest()
+          } else {
+            collapsedElements.two = true
+          }
         })
 
-        triggerTwo.click()
-        nestedCollapseOne.removeEventListener('shown.bs.collapse', handlerNestedCollapseOne)
-      }
+        collapseTwoTwo.addEventListener('shown.bs.collapse', () => {
+          if (collapsedElements.two) {
+            secondTest()
+          } else {
+            collapsedElements.two = true
+          }
+        })
 
-      collapseOne.addEventListener('shown.bs.collapse', handlerCollapseOne)
-      trigger.click()
+        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-bs-toggle="collapse" href="#test1"></a>',
-        '<a id="trigger2" role="button" data-bs-toggle="collapse" href="#test2"></a>',
-        '<a id="trigger3" role="button" data-bs-toggle="collapse" href=".multi"></a>',
-        '<div id="test1" class="multi"></div>',
-        '<div id="test2" class="multi"></div>'
-      ].join('')
+    it('should collapse accordion children but not nested accordion children', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = [
+          '<div id="accordion">',
+          '  <div class="item">',
+          '    <a id="linkTrigger" data-bs-toggle="collapse" href="#collapseOne" aria-expanded="false" aria-controls="collapseOne"></a>',
+          '    <div id="collapseOne" data-bs-parent="#accordion" class="collapse" role="tabpanel">',
+          '      <div id="nestedAccordion">',
+          '        <div class="item">',
+          '          <a id="nestedLinkTrigger" data-bs-toggle="collapse" href="#nestedCollapseOne" aria-expanded="false" aria-controls="nestedCollapseOne"></a>',
+          '          <div id="nestedCollapseOne" data-bs-parent="#nestedAccordion" class="collapse" role="tabpanel"></div>',
+          '        </div>',
+          '      </div>',
+          '    </div>',
+          '  </div>',
+          '  <div class="item">',
+          '    <a id="linkTriggerTwo" data-bs-toggle="collapse" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo"></a>',
+          '    <div id="collapseTwo" data-bs-parent="#accordion" class="collapse show" role="tabpanel"></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).toHaveClass('show')
+          expect(collapseTwo).not.toHaveClass('show')
+          expect(nestedCollapseOne).not.toHaveClass('show')
+
+          nestedCollapseOne.addEventListener('shown.bs.collapse', handlerNestedCollapseOne)
+          nestedTrigger.click()
+          collapseOne.removeEventListener('shown.bs.collapse', handlerCollapseOne)
+        }
 
-      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')
+        function handlerNestedCollapseOne() {
+          expect(collapseOne).toHaveClass('show')
+          expect(collapseTwo).not.toHaveClass('show')
+          expect(nestedCollapseOne).toHaveClass('show')
 
-      const target2Shown = () => {
-        expect(trigger1.classList.contains('collapsed')).toEqual(false)
-        expect(trigger1.getAttribute('aria-expanded')).toEqual('true')
+          collapseTwo.addEventListener('shown.bs.collapse', () => {
+            expect(collapseOne).not.toHaveClass('show')
+            expect(collapseTwo).toHaveClass('show')
+            expect(nestedCollapseOne).toHaveClass('show')
+            resolve()
+          })
 
-        expect(trigger2.classList.contains('collapsed')).toEqual(false)
-        expect(trigger2.getAttribute('aria-expanded')).toEqual('true')
+          triggerTwo.click()
+          nestedCollapseOne.removeEventListener('shown.bs.collapse', handlerNestedCollapseOne)
+        }
 
-        expect(trigger3.classList.contains('collapsed')).toEqual(false)
-        expect(trigger3.getAttribute('aria-expanded')).toEqual('true')
+        collapseOne.addEventListener('shown.bs.collapse', handlerCollapseOne)
+        trigger.click()
+      })
+    })
 
-        target2.addEventListener('hidden.bs.collapse', () => {
-          expect(trigger1.classList.contains('collapsed')).toEqual(false)
+    it('should add "collapsed" class and set aria-expanded to triggers only when all the targeted collapse are hidden', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = [
+          '<a id="trigger1" role="button" data-bs-toggle="collapse" href="#test1"></a>',
+          '<a id="trigger2" role="button" data-bs-toggle="collapse" href="#0/my/id"></a>',
+          '<a id="trigger3" role="button" data-bs-toggle="collapse" href=".multi"></a>',
+          '<div id="test1" class="multi"></div>',
+          '<div id="0/my/id" class="multi"></div>'
+        ].join('')
+
+        const trigger1 = fixtureEl.querySelector('#trigger1')
+        const trigger2 = fixtureEl.querySelector('#trigger2')
+        const trigger3 = fixtureEl.querySelector('#trigger3')
+        const target1 = fixtureEl.querySelector('#test1')
+        const target2 = fixtureEl.querySelector(`#${CSS.escape('0/my/id')}`)
+
+        const target2Shown = () => {
+          expect(trigger1).not.toHaveClass('collapsed')
           expect(trigger1.getAttribute('aria-expanded')).toEqual('true')
 
-          expect(trigger2.classList.contains('collapsed')).toEqual(true)
-          expect(trigger2.getAttribute('aria-expanded')).toEqual('false')
+          expect(trigger2).not.toHaveClass('collapsed')
+          expect(trigger2.getAttribute('aria-expanded')).toEqual('true')
 
-          expect(trigger3.classList.contains('collapsed')).toEqual(false)
+          expect(trigger3).not.toHaveClass('collapsed')
           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')
+          target2.addEventListener('hidden.bs.collapse', () => {
+            expect(trigger1).not.toHaveClass('collapsed')
+            expect(trigger1.getAttribute('aria-expanded')).toEqual('true')
 
-            expect(trigger2.classList.contains('collapsed')).toEqual(true)
+            expect(trigger2).toHaveClass('collapsed')
             expect(trigger2.getAttribute('aria-expanded')).toEqual('false')
 
-            expect(trigger3.classList.contains('collapsed')).toEqual(true)
-            expect(trigger3.getAttribute('aria-expanded')).toEqual('false')
-            done()
-          })
+            expect(trigger3).not.toHaveClass('collapsed')
+            expect(trigger3.getAttribute('aria-expanded')).toEqual('true')
 
-          trigger1.click()
-        })
+            target1.addEventListener('hidden.bs.collapse', () => {
+              expect(trigger1).toHaveClass('collapsed')
+              expect(trigger1.getAttribute('aria-expanded')).toEqual('false')
 
-        trigger2.click()
-      }
+              expect(trigger2).toHaveClass('collapsed')
+              expect(trigger2.getAttribute('aria-expanded')).toEqual('false')
 
-      target2.addEventListener('shown.bs.collapse', target2Shown)
-      trigger3.click()
+              expect(trigger3).toHaveClass('collapsed')
+              expect(trigger3.getAttribute('aria-expanded')).toEqual('false')
+              resolve()
+            })
+
+            trigger1.click()
+          })
+
+          trigger2.click()
+        }
+
+        target2.addEventListener('shown.bs.collapse', target2Shown)
+        trigger3.click()
+      })
     })
   })
 
@@ -961,7 +1002,7 @@ describe('Collapse', () => {
 
       const div = fixtureEl.querySelector('div')
 
-      expect(Collapse.getInstance(div)).toEqual(null)
+      expect(Collapse.getInstance(div)).toBeNull()
     })
   })
 
@@ -982,7 +1023,7 @@ describe('Collapse', () => {
 
       const div = fixtureEl.querySelector('div')
 
-      expect(Collapse.getInstance(div)).toEqual(null)
+      expect(Collapse.getInstance(div)).toBeNull()
       expect(Collapse.getOrCreateInstance(div)).toBeInstanceOf(Collapse)
     })
 
@@ -991,13 +1032,13 @@ describe('Collapse', () => {
 
       const div = fixtureEl.querySelector('div')
 
-      expect(Collapse.getInstance(div)).toEqual(null)
+      expect(Collapse.getInstance(div)).toBeNull()
       const collapse = Collapse.getOrCreateInstance(div, {
         toggle: false
       })
       expect(collapse).toBeInstanceOf(Collapse)
 
-      expect(collapse._config.toggle).toEqual(false)
+      expect(collapse._config.toggle).toBeFalse()
     })
 
     it('should return the instance when exists without given configuration', () => {
@@ -1015,7 +1056,7 @@ describe('Collapse', () => {
       expect(collapse).toBeInstanceOf(Collapse)
       expect(collapse2).toEqual(collapse)
 
-      expect(collapse2._config.toggle).toEqual(false)
+      expect(collapse2._config.toggle).toBeFalse()
     })
   })
 })