Merge branch 'twbs:main' into mainHEADmain

1 files changed, 815 insertions, 663 deletions

diff --git a/js/tests/unit/tooltip.spec.js b/js/tests/unit/tooltip.spec.js
index 4a7022234..37f2c230d 100644
--- a/js/tests/unit/tooltip.spec.js
+++ b/js/tests/unit/tooltip.spec.js
@@ -1,7 +1,9 @@
-import Tooltip from '../../src/tooltip'
-import EventHandler from '../../src/dom/event-handler'
-import { noop } from '../../src/util/index'
-import { clearFixture, createEvent, getFixture, jQueryMock } from '../helpers/fixture'
+import EventHandler from '../../src/dom/event-handler.js'
+import Tooltip from '../../src/tooltip.js'
+import { noop } from '../../src/util/index.js'
+import {
+  clearFixture, createEvent, getFixture, jQueryMock
+} from '../helpers/fixture.js'
 
 describe('Tooltip', () => {
   let fixtureEl
@@ -42,12 +44,6 @@ describe('Tooltip', () => {
     })
   })
 
-  describe('Event', () => {
-    it('should return plugin events', () => {
-      expect(Tooltip.Event).toEqual(jasmine.any(Object))
-    })
-  })
-
   describe('EVENT_KEY', () => {
     it('should return plugin event key', () => {
       expect(Tooltip.EVENT_KEY).toEqual('.bs.tooltip')
@@ -62,7 +58,7 @@ describe('Tooltip', () => {
 
   describe('constructor', () => {
     it('should take care of element either passed as a CSS selector or DOM element', () => {
-      fixtureEl.innerHTML = '<a href="#" id="tooltipEl" rel="tooltip" title="Nice and short title">'
+      fixtureEl.innerHTML = '<a href="#" id="tooltipEl" rel="tooltip" title="Nice and short title"></a>'
 
       const tooltipEl = fixtureEl.querySelector('#tooltipEl')
       const tooltipBySelector = new Tooltip('#tooltipEl')
@@ -73,16 +69,16 @@ describe('Tooltip', () => {
     })
 
     it('should not take care of disallowed data attributes', () => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" data-bs-sanitize="false" title="Another tooltip">'
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip" data-bs-sanitize="false" title="Another tooltip"></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
       const tooltip = new Tooltip(tooltipEl)
 
-      expect(tooltip._config.sanitize).toEqual(true)
+      expect(tooltip._config.sanitize).toBeTrue()
     })
 
     it('should convert title and content to string if numbers', () => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip">'
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip"></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
       const tooltip = new Tooltip(tooltipEl, {
@@ -94,56 +90,60 @@ describe('Tooltip', () => {
       expect(tooltip._config.content).toEqual('7')
     })
 
-    it('should enable selector delegation', done => {
-      fixtureEl.innerHTML = '<div></div>'
+    it('should enable selector delegation', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<div></div>'
 
-      const containerEl = fixtureEl.querySelector('div')
-      const tooltipContainer = new Tooltip(containerEl, {
-        selector: 'a[rel="tooltip"]',
-        trigger: 'click'
-      })
+        const containerEl = fixtureEl.querySelector('div')
+        const tooltipContainer = new Tooltip(containerEl, {
+          selector: 'a[rel="tooltip"]',
+          trigger: 'click'
+        })
 
-      containerEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+        containerEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipInContainerEl = containerEl.querySelector('a')
+        const tooltipInContainerEl = containerEl.querySelector('a')
 
-      tooltipInContainerEl.addEventListener('shown.bs.tooltip', () => {
-        expect(document.querySelector('.tooltip')).not.toBeNull()
-        tooltipContainer.dispose()
-        done()
-      })
+        tooltipInContainerEl.addEventListener('shown.bs.tooltip', () => {
+          expect(document.querySelector('.tooltip')).not.toBeNull()
+          tooltipContainer.dispose()
+          resolve()
+        })
 
-      tooltipInContainerEl.click()
+        tooltipInContainerEl.click()
+      })
     })
 
-    it('should create offset modifier when offset is passed as a function', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Offset from function">'
+    it('should create offset modifier when offset is passed as a function', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Offset from function"></a>'
 
-      const getOffset = jasmine.createSpy('getOffset').and.returnValue([10, 20])
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl, {
-        offset: getOffset,
-        popperConfig: {
-          onFirstUpdate: state => {
-            expect(getOffset).toHaveBeenCalledWith({
-              popper: state.rects.popper,
-              reference: state.rects.reference,
-              placement: state.placement
-            }, tooltipEl)
-            done()
+        const getOffset = jasmine.createSpy('getOffset').and.returnValue([10, 20])
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl, {
+          offset: getOffset,
+          popperConfig: {
+            onFirstUpdate(state) {
+              expect(getOffset).toHaveBeenCalledWith({
+                popper: state.rects.popper,
+                reference: state.rects.reference,
+                placement: state.placement
+              }, tooltipEl)
+              resolve()
+            }
           }
-        }
-      })
+        })
 
-      const offset = tooltip._getOffset()
+        const offset = tooltip._getOffset()
 
-      expect(typeof offset).toEqual('function')
+        expect(offset).toEqual(jasmine.any(Function))
 
-      tooltip.show()
+        tooltip.show()
+      })
     })
 
     it('should create offset modifier when offset option is passed in data attribute', () => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" data-bs-offset="10,20" title="Another tooltip">'
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip" data-bs-offset="10,20" title="Another tooltip"></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
       const tooltip = new Tooltip(tooltipEl)
@@ -152,7 +152,7 @@ describe('Tooltip', () => {
     })
 
     it('should allow to pass config to Popper with `popperConfig`', () => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip">'
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip"></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
       const tooltip = new Tooltip(tooltipEl, {
@@ -167,7 +167,7 @@ describe('Tooltip', () => {
     })
 
     it('should allow to pass config to Popper with `popperConfig` as a function', () => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip">'
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip"></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
       const getPopperConfig = jasmine.createSpy('getPopperConfig').and.returnValue({ placement: 'left' })
@@ -177,163 +177,189 @@ describe('Tooltip', () => {
 
       const popperConfig = tooltip._getPopperConfig('top')
 
-      expect(getPopperConfig).toHaveBeenCalled()
+      // Ensure that the function was called with the default config.
+      expect(getPopperConfig).toHaveBeenCalledWith(jasmine.objectContaining({
+        placement: jasmine.any(String)
+      }))
       expect(popperConfig.placement).toEqual('left')
     })
-  })
 
-  describe('enable', () => {
-    it('should enable a tooltip', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should use original title, if not "data-bs-title" is given', () => {
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
       const tooltip = new Tooltip(tooltipEl)
 
-      tooltip.enable()
+      expect(tooltip._getTitle()).toEqual('Another tooltip')
+    })
+  })
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
-        expect(document.querySelector('.tooltip')).not.toBeNull()
-        done()
-      })
+  describe('enable', () => {
+    it('should enable a tooltip', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      tooltip.show()
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
+
+        tooltip.enable()
+
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          expect(document.querySelector('.tooltip')).not.toBeNull()
+          resolve()
+        })
+
+        tooltip.show()
+      })
     })
   })
 
   describe('disable', () => {
-    it('should disable tooltip', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should disable tooltip', () => {
+      return new Promise((resolve, reject) => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl)
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
 
-      tooltip.disable()
+        tooltip.disable()
 
-      tooltipEl.addEventListener('show.bs.tooltip', () => {
-        throw new Error('should not show a disabled tooltip')
-      })
+        tooltipEl.addEventListener('show.bs.tooltip', () => {
+          reject(new Error('should not show a disabled tooltip'))
+        })
 
-      tooltip.show()
+        tooltip.show()
 
-      setTimeout(() => {
-        expect().nothing()
-        done()
-      }, 10)
+        setTimeout(() => {
+          expect().nothing()
+          resolve()
+        }, 10)
+      })
     })
   })
 
   describe('toggleEnabled', () => {
     it('should toggle enabled', () => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
       const tooltip = new Tooltip(tooltipEl)
 
-      expect(tooltip._isEnabled).toEqual(true)
+      expect(tooltip._isEnabled).toBeTrue()
 
       tooltip.toggleEnabled()
 
-      expect(tooltip._isEnabled).toEqual(false)
+      expect(tooltip._isEnabled).toBeFalse()
     })
   })
 
   describe('toggle', () => {
-    it('should do nothing if disabled', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should do nothing if disabled', () => {
+      return new Promise((resolve, reject) => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl)
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
 
-      tooltip.disable()
+        tooltip.disable()
 
-      tooltipEl.addEventListener('show.bs.tooltip', () => {
-        throw new Error('should not show a disabled tooltip')
-      })
+        tooltipEl.addEventListener('show.bs.tooltip', () => {
+          reject(new Error('should not show a disabled tooltip'))
+        })
 
-      tooltip.toggle()
+        tooltip.toggle()
 
-      setTimeout(() => {
-        expect().nothing()
-        done()
-      }, 10)
+        setTimeout(() => {
+          expect().nothing()
+          resolve()
+        }, 10)
+      })
     })
 
-    it('should show a tooltip', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should show a tooltip', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl)
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
-        expect(document.querySelector('.tooltip')).not.toBeNull()
-        done()
-      })
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          expect(document.querySelector('.tooltip')).not.toBeNull()
+          resolve()
+        })
 
-      tooltip.toggle()
+        tooltip.toggle()
+      })
     })
 
-    it('should call toggle and show the tooltip when trigger is "click"', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should call toggle and show the tooltip when trigger is "click"', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl, {
-        trigger: 'click'
-      })
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl, {
+          trigger: 'click'
+        })
 
-      spyOn(tooltip, 'toggle').and.callThrough()
+        const spy = spyOn(tooltip, 'toggle').and.callThrough()
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
-        expect(tooltip.toggle).toHaveBeenCalled()
-        done()
-      })
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          expect(spy).toHaveBeenCalled()
+          resolve()
+        })
 
-      tooltipEl.click()
+        tooltipEl.click()
+      })
     })
 
-    it('should hide a tooltip', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should hide a tooltip', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl)
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
+
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          tooltip.toggle()
+        })
+
+        tooltipEl.addEventListener('hidden.bs.tooltip', () => {
+          expect(document.querySelector('.tooltip')).toBeNull()
+          resolve()
+        })
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
         tooltip.toggle()
       })
+    })
 
-      tooltipEl.addEventListener('hidden.bs.tooltip', () => {
-        expect(document.querySelector('.tooltip')).toBeNull()
-        done()
-      })
+    it('should call toggle and hide the tooltip when trigger is "click"', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      tooltip.toggle()
-    })
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl, {
+          trigger: 'click'
+        })
 
-    it('should call toggle and hide the tooltip when trigger is "click"', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+        const spy = spyOn(tooltip, 'toggle').and.callThrough()
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl, {
-        trigger: 'click'
-      })
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          tooltipEl.click()
+        })
 
-      spyOn(tooltip, 'toggle').and.callThrough()
+        tooltipEl.addEventListener('hidden.bs.tooltip', () => {
+          expect(spy).toHaveBeenCalled()
+          resolve()
+        })
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
         tooltipEl.click()
       })
-
-      tooltipEl.addEventListener('hidden.bs.tooltip', () => {
-        expect(tooltip.toggle).toHaveBeenCalled()
-        done()
-      })
-
-      tooltipEl.click()
     })
   })
 
   describe('dispose', () => {
     it('should destroy a tooltip', () => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
       const addEventSpy = spyOn(tooltipEl, 'addEventListener').and.callThrough()
@@ -354,246 +380,290 @@ describe('Tooltip', () => {
 
       tooltip.dispose()
 
-      expect(Tooltip.getInstance(tooltipEl)).toEqual(null)
+      expect(Tooltip.getInstance(tooltipEl)).toBeNull()
       expect(removeEventSpy.calls.allArgs()).toEqual(expectedArgs)
     })
 
-    it('should destroy a tooltip after it is shown and hidden', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should destroy a tooltip after it is shown and hidden', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl)
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
-        tooltip.hide()
-      })
-      tooltipEl.addEventListener('hidden.bs.tooltip', () => {
-        tooltip.dispose()
-        expect(tooltip.tip).toEqual(null)
-        expect(Tooltip.getInstance(tooltipEl)).toEqual(null)
-        done()
-      })
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          tooltip.hide()
+        })
+        tooltipEl.addEventListener('hidden.bs.tooltip', () => {
+          tooltip.dispose()
+          expect(tooltip.tip).toBeNull()
+          expect(Tooltip.getInstance(tooltipEl)).toBeNull()
+          resolve()
+        })
 
-      tooltip.show()
+        tooltip.show()
+      })
     })
 
-    it('should destroy a tooltip and remove it from the dom', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should destroy a tooltip and remove it from the dom', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl)
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
+
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          expect(document.querySelector('.tooltip')).not.toBeNull()
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
-        expect(document.querySelector('.tooltip')).not.toBeNull()
+          tooltip.dispose()
 
-        tooltip.dispose()
+          expect(document.querySelector('.tooltip')).toBeNull()
+          resolve()
+        })
 
-        expect(document.querySelector('.tooltip')).toBeNull()
-        done()
+        tooltip.show()
       })
+    })
 
-      tooltip.show()
+    it('should destroy a tooltip and reset it\'s initial title', () => {
+      fixtureEl.innerHTML = [
+        '<span id="tooltipWithTitle" rel="tooltip" title="tooltipTitle"></span>',
+        '<span id="tooltipWithoutTitle" rel="tooltip" data-bs-title="tooltipTitle"></span>'
+      ].join('')
+
+      const tooltipWithTitleEl = fixtureEl.querySelector('#tooltipWithTitle')
+      const tooltip = new Tooltip('#tooltipWithTitle')
+      expect(tooltipWithTitleEl.getAttribute('title')).toBeNull()
+      tooltip.dispose()
+      expect(tooltipWithTitleEl.getAttribute('title')).toBe('tooltipTitle')
+
+      const tooltipWithoutTitleEl = fixtureEl.querySelector('#tooltipWithoutTitle')
+      const tooltip2 = new Tooltip('#tooltipWithTitle')
+      expect(tooltipWithoutTitleEl.getAttribute('title')).toBeNull()
+      tooltip2.dispose()
+      expect(tooltipWithoutTitleEl.getAttribute('title')).toBeNull()
     })
   })
 
   describe('show', () => {
-    it('should show a tooltip', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should show a tooltip', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl)
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
-        const tooltipShown = document.querySelector('.tooltip')
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          const tooltipShown = document.querySelector('.tooltip')
 
-        expect(tooltipShown).not.toBeNull()
-        expect(tooltipEl.getAttribute('aria-describedby')).toEqual(tooltipShown.getAttribute('id'))
-        expect(tooltipShown.getAttribute('id')).toContain('tooltip')
-        done()
-      })
+          expect(tooltipShown).not.toBeNull()
+          expect(tooltipEl.getAttribute('aria-describedby')).toEqual(tooltipShown.getAttribute('id'))
+          expect(tooltipShown.getAttribute('id')).toContain('tooltip')
+          resolve()
+        })
 
-      tooltip.show()
+        tooltip.show()
+      })
     })
 
-    it('should show a tooltip when hovering a children element', done => {
-      fixtureEl.innerHTML =
-        '<a href="#" rel="tooltip" title="Another tooltip">' +
-          '<svg xmlns="http://www.w3.org/2000/svg" width="50" height="50" viewBox="0 0 100 100">' +
-            '<rect width="100%" fill="#563d7c"/>' +
-            '<circle cx="50" cy="50" r="30" fill="#fff"/>' +
-          '</svg>' +
-        '</a>'
+    it('should show a tooltip when hovering a child element', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = [
+          '<a href="#" rel="tooltip" title="Another tooltip">',
+          '  <svg xmlns="http://www.w3.org/2000/svg" width="50" height="50" viewBox="0 0 100 100">',
+          '    <rect width="100%" fill="#563d7c"/>',
+          '    <circle cx="50" cy="50" r="30" fill="#fff"/>',
+          '  </svg>',
+          '</a>'
+        ].join('')
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl)
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
 
-      spyOn(tooltip, 'show')
+        const spy = spyOn(tooltip, 'show')
 
-      tooltipEl.querySelector('rect').dispatchEvent(createEvent('mouseover', { bubbles: true }))
+        tooltipEl.querySelector('rect').dispatchEvent(createEvent('mouseover', { bubbles: true }))
 
-      setTimeout(() => {
-        expect(tooltip.show).toHaveBeenCalled()
-        done()
-      }, 0)
+        setTimeout(() => {
+          expect(spy).toHaveBeenCalled()
+          resolve()
+        }, 0)
+      })
     })
 
-    it('should show a tooltip on mobile', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should show a tooltip on mobile', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl)
-      document.documentElement.ontouchstart = noop
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
+        document.documentElement.ontouchstart = noop
 
-      spyOn(EventHandler, 'on').and.callThrough()
+        const spy = spyOn(EventHandler, 'on').and.callThrough()
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
-        expect(document.querySelector('.tooltip')).not.toBeNull()
-        expect(EventHandler.on).toHaveBeenCalledWith(jasmine.any(Object), 'mouseover', noop)
-        document.documentElement.ontouchstart = undefined
-        done()
-      })
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          expect(document.querySelector('.tooltip')).not.toBeNull()
+          expect(spy).toHaveBeenCalledWith(jasmine.any(Object), 'mouseover', noop)
+          document.documentElement.ontouchstart = undefined
+          resolve()
+        })
 
-      tooltip.show()
+        tooltip.show()
+      })
     })
 
-    it('should show a tooltip relative to placement option', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should show a tooltip relative to placement option', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl, {
-        placement: 'bottom'
-      })
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl, {
+          placement: 'bottom'
+        })
 
-      tooltipEl.addEventListener('inserted.bs.tooltip', () => {
-        expect(tooltip.getTipElement().classList.contains('bs-tooltip-auto')).toEqual(true)
-      })
+        tooltipEl.addEventListener('inserted.bs.tooltip', () => {
+          expect(tooltip._getTipElement()).toHaveClass('bs-tooltip-auto')
+        })
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
-        expect(tooltip.getTipElement().classList.contains('bs-tooltip-auto')).toEqual(true)
-        expect(tooltip.getTipElement().getAttribute('data-popper-placement')).toEqual('bottom')
-        done()
-      })
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          expect(tooltip._getTipElement()).toHaveClass('bs-tooltip-auto')
+          expect(tooltip._getTipElement().getAttribute('data-popper-placement')).toEqual('bottom')
+          resolve()
+        })
 
-      tooltip.show()
+        tooltip.show()
+      })
     })
 
-    it('should not error when trying to show a tooltip that has been removed from the dom', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should not error when trying to show a tooltip that has been removed from the dom', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl)
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
 
-      const firstCallback = () => {
-        tooltipEl.removeEventListener('shown.bs.tooltip', firstCallback)
-        let tooltipShown = document.querySelector('.tooltip')
+        const firstCallback = () => {
+          tooltipEl.removeEventListener('shown.bs.tooltip', firstCallback)
+          let tooltipShown = document.querySelector('.tooltip')
 
-        tooltipShown.remove()
+          tooltipShown.remove()
 
-        tooltipEl.addEventListener('shown.bs.tooltip', () => {
-          tooltipShown = document.querySelector('.tooltip')
+          tooltipEl.addEventListener('shown.bs.tooltip', () => {
+            tooltipShown = document.querySelector('.tooltip')
 
-          expect(tooltipShown).not.toBeNull()
-          done()
-        })
+            expect(tooltipShown).not.toBeNull()
+            resolve()
+          })
 
-        tooltip.show()
-      }
+          tooltip.show()
+        }
 
-      tooltipEl.addEventListener('shown.bs.tooltip', firstCallback)
+        tooltipEl.addEventListener('shown.bs.tooltip', firstCallback)
 
-      tooltip.show()
+        tooltip.show()
+      })
     })
 
-    it('should show a tooltip with a dom element container', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should show a tooltip with a dom element container', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl, {
-        container: fixtureEl
-      })
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl, {
+          container: fixtureEl
+        })
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
-        expect(fixtureEl.querySelector('.tooltip')).not.toBeNull()
-        done()
-      })
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          expect(fixtureEl.querySelector('.tooltip')).not.toBeNull()
+          resolve()
+        })
 
-      tooltip.show()
+        tooltip.show()
+      })
     })
 
-    it('should show a tooltip with a jquery element container', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should show a tooltip with a jquery element container', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl, {
-        container: {
-          0: fixtureEl,
-          jquery: 'jQuery'
-        }
-      })
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl, {
+          container: {
+            0: fixtureEl,
+            jquery: 'jQuery'
+          }
+        })
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
-        expect(fixtureEl.querySelector('.tooltip')).not.toBeNull()
-        done()
-      })
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          expect(fixtureEl.querySelector('.tooltip')).not.toBeNull()
+          resolve()
+        })
 
-      tooltip.show()
+        tooltip.show()
+      })
     })
 
-    it('should show a tooltip with a selector in container', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should show a tooltip with a selector in container', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl, {
-        container: '#fixture'
-      })
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl, {
+          container: '#fixture'
+        })
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
-        expect(fixtureEl.querySelector('.tooltip')).not.toBeNull()
-        done()
-      })
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          expect(fixtureEl.querySelector('.tooltip')).not.toBeNull()
+          resolve()
+        })
 
-      tooltip.show()
+        tooltip.show()
+      })
     })
 
-    it('should show a tooltip with placement as a function', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should show a tooltip with placement as a function', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const spy = jasmine.createSpy('placement').and.returnValue('top')
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl, {
-        placement: spy
-      })
+        const spy = jasmine.createSpy('placement').and.returnValue('top')
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl, {
+          placement: spy
+        })
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
-        expect(document.querySelector('.tooltip')).not.toBeNull()
-        expect(spy).toHaveBeenCalled()
-        done()
-      })
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          expect(document.querySelector('.tooltip')).not.toBeNull()
+          expect(spy).toHaveBeenCalled()
+          resolve()
+        })
 
-      tooltip.show()
+        tooltip.show()
+      })
     })
 
-    it('should show a tooltip without the animation', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should show a tooltip without the animation', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl, {
-        animation: false
-      })
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl, {
+          animation: false
+        })
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
-        const tip = document.querySelector('.tooltip')
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          const tip = document.querySelector('.tooltip')
 
-        expect(tip).not.toBeNull()
-        expect(tip.classList.contains('fade')).toEqual(false)
-        done()
-      })
+          expect(tip).not.toBeNull()
+          expect(tip).not.toHaveClass('fade')
+          resolve()
+        })
 
-      tooltip.show()
+        tooltip.show()
+      })
     })
 
     it('should throw an error the element is not visible', () => {
-      fixtureEl.innerHTML = '<a href="#" style="display: none" rel="tooltip" title="Another tooltip">'
+      fixtureEl.innerHTML = '<a href="#" style="display: none" rel="tooltip" title="Another tooltip"></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
       const tooltip = new Tooltip(tooltipEl)
@@ -605,339 +675,382 @@ describe('Tooltip', () => {
       }
     })
 
-    it('should not show a tooltip if show.bs.tooltip is prevented', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
-
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl)
-
-      const expectedDone = () => {
-        setTimeout(() => {
-          expect(document.querySelector('.tooltip')).toBeNull()
-          done()
-        }, 10)
-      }
+    it('should not show a tooltip if show.bs.tooltip is prevented', () => {
+      return new Promise((resolve, reject) => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      tooltipEl.addEventListener('show.bs.tooltip', ev => {
-        ev.preventDefault()
-        expectedDone()
-      })
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
-        throw new Error('Tooltip should not be shown')
-      })
+        const expectedDone = () => {
+          setTimeout(() => {
+            expect(document.querySelector('.tooltip')).toBeNull()
+            resolve()
+          }, 10)
+        }
 
-      tooltip.show()
-    })
+        tooltipEl.addEventListener('show.bs.tooltip', ev => {
+          ev.preventDefault()
+          expectedDone()
+        })
 
-    it('should show tooltip if leave event hasn\'t occurred before delay expires', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          reject(new Error('Tooltip should not be shown'))
+        })
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl, {
-        delay: 150
+        tooltip.show()
       })
-
-      spyOn(tooltip, 'show')
-
-      setTimeout(() => {
-        expect(tooltip.show).not.toHaveBeenCalled()
-      }, 100)
-
-      setTimeout(() => {
-        expect(tooltip.show).toHaveBeenCalled()
-        done()
-      }, 200)
-
-      tooltipEl.dispatchEvent(createEvent('mouseover'))
     })
 
-    it('should not show tooltip if leave event occurs before delay expires', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should show tooltip if leave event hasn\'t occurred before delay expires', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl, {
-        delay: 150
-      })
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl, {
+          delay: 150
+        })
 
-      spyOn(tooltip, 'show')
+        const spy = spyOn(tooltip, 'show')
 
-      setTimeout(() => {
-        expect(tooltip.show).not.toHaveBeenCalled()
-        tooltipEl.dispatchEvent(createEvent('mouseover'))
-      }, 100)
+        setTimeout(() => {
+          expect(spy).not.toHaveBeenCalled()
+        }, 100)
 
-      setTimeout(() => {
-        expect(tooltip.show).toHaveBeenCalled()
-        expect(document.querySelectorAll('.tooltip').length).toEqual(0)
-        done()
-      }, 200)
+        setTimeout(() => {
+          expect(spy).toHaveBeenCalled()
+          resolve()
+        }, 200)
 
-      tooltipEl.dispatchEvent(createEvent('mouseover'))
+        tooltipEl.dispatchEvent(createEvent('mouseover'))
+      })
     })
 
-    it('should not hide tooltip if leave event occurs and enter event occurs within the hide delay', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should not show tooltip if leave event occurs before delay expires', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl, {
-        delay: {
-          show: 0,
-          hide: 150
-        }
-      })
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl, {
+          delay: 150
+        })
 
-      setTimeout(() => {
-        expect(tooltip.getTipElement().classList.contains('show')).toEqual(true)
-        tooltipEl.dispatchEvent(createEvent('mouseout'))
+        const spy = spyOn(tooltip, 'show')
 
         setTimeout(() => {
-          expect(tooltip.getTipElement().classList.contains('show')).toEqual(true)
+          expect(spy).not.toHaveBeenCalled()
           tooltipEl.dispatchEvent(createEvent('mouseover'))
         }, 100)
 
         setTimeout(() => {
-          expect(tooltip.getTipElement().classList.contains('show')).toEqual(true)
-          expect(document.querySelectorAll('.tooltip').length).toEqual(1)
-          done()
+          expect(spy).toHaveBeenCalled()
+          expect(document.querySelectorAll('.tooltip')).toHaveSize(0)
+          resolve()
         }, 200)
-      }, 0)
 
-      tooltipEl.dispatchEvent(createEvent('mouseover'))
+        tooltipEl.dispatchEvent(createEvent('mouseover'))
+      })
     })
 
-    it('should not hide tooltip if leave event occurs and interaction remains inside trigger', done => {
-      fixtureEl.innerHTML = [
-        '<a href="#" rel="tooltip" title="Another tooltip">',
-        '<b>Trigger</b>',
-        'the tooltip',
-        '</a>'
-      ]
+    it('should not hide tooltip if leave event occurs and enter event occurs within the hide delay', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip" data-bs-delay=\'{"show":0,"hide":150}\'>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl)
-      const triggerChild = tooltipEl.querySelector('b')
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
 
-      spyOn(tooltip, 'hide').and.callThrough()
+        expect(tooltip._config.delay).toEqual({ show: 0, hide: 150 })
 
-      tooltipEl.addEventListener('mouseover', () => {
-        const moveMouseToChildEvent = createEvent('mouseout')
-        Object.defineProperty(moveMouseToChildEvent, 'relatedTarget', {
-          value: triggerChild
-        })
+        setTimeout(() => {
+          expect(tooltip._getTipElement()).toHaveClass('show')
+          tooltipEl.dispatchEvent(createEvent('mouseout'))
+
+          setTimeout(() => {
+            expect(tooltip._getTipElement()).toHaveClass('show')
+            tooltipEl.dispatchEvent(createEvent('mouseover'))
+          }, 100)
+
+          setTimeout(() => {
+            expect(tooltip._getTipElement()).toHaveClass('show')
+            expect(document.querySelectorAll('.tooltip')).toHaveSize(1)
+            resolve()
+          }, 200)
+        }, 10)
 
-        tooltipEl.dispatchEvent(moveMouseToChildEvent)
+        tooltipEl.dispatchEvent(createEvent('mouseover'))
       })
+    })
 
-      tooltipEl.addEventListener('mouseout', () => {
-        expect(tooltip.hide).not.toHaveBeenCalled()
-        done()
-      })
+    it('should not hide tooltip if leave event occurs and interaction remains inside trigger', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = [
+          '<a href="#" rel="tooltip" title="Another tooltip">',
+          '<b>Trigger</b>',
+          'the tooltip',
+          '</a>'
+        ].join('')
 
-      tooltipEl.dispatchEvent(createEvent('mouseover'))
-    })
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
+        const triggerChild = tooltipEl.querySelector('b')
 
-    it('should properly maintain tooltip state if leave event occurs and enter event occurs during hide transition', done => {
-      // Style this tooltip to give it plenty of room for popper to do what it wants
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip" data-bs-placement="top" style="position:fixed;left:50%;top:50%;">Trigger</a>'
+        const spy = spyOn(tooltip, 'hide').and.callThrough()
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl)
+        tooltipEl.addEventListener('mouseover', () => {
+          const moveMouseToChildEvent = createEvent('mouseout')
+          Object.defineProperty(moveMouseToChildEvent, 'relatedTarget', {
+            value: triggerChild
+          })
+
+          tooltipEl.dispatchEvent(moveMouseToChildEvent)
+        })
+
+        tooltipEl.addEventListener('mouseout', () => {
+          expect(spy).not.toHaveBeenCalled()
+          resolve()
+        })
 
-      spyOn(window, 'getComputedStyle').and.returnValue({
-        transitionDuration: '0.15s',
-        transitionDelay: '0s'
+        tooltipEl.dispatchEvent(createEvent('mouseover'))
       })
+    })
 
-      setTimeout(() => {
-        expect(tooltip._popper).not.toBeNull()
-        expect(tooltip.getTipElement().getAttribute('data-popper-placement')).toBe('top')
-        tooltipEl.dispatchEvent(createEvent('mouseout'))
+    it('should properly maintain tooltip state if leave event occurs and enter event occurs during hide transition', () => {
+      return new Promise(resolve => {
+        // Style this tooltip to give it plenty of room for popper to do what it wants
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip" data-bs-placement="top" style="position:fixed;left:50%;top:50%;">Trigger</a>'
 
-        setTimeout(() => {
-          expect(tooltip.getTipElement().classList.contains('show')).toEqual(false)
-          tooltipEl.dispatchEvent(createEvent('mouseover'))
-        }, 100)
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
+
+        spyOn(window, 'getComputedStyle').and.returnValue({
+          transitionDuration: '0.15s',
+          transitionDelay: '0s'
+        })
 
         setTimeout(() => {
           expect(tooltip._popper).not.toBeNull()
-          expect(tooltip.getTipElement().getAttribute('data-popper-placement')).toBe('top')
-          done()
-        }, 200)
-      }, 0)
+          expect(tooltip._getTipElement().getAttribute('data-popper-placement')).toEqual('top')
+          tooltipEl.dispatchEvent(createEvent('mouseout'))
+
+          setTimeout(() => {
+            expect(tooltip._getTipElement()).not.toHaveClass('show')
+            tooltipEl.dispatchEvent(createEvent('mouseover'))
+          }, 100)
+
+          setTimeout(() => {
+            expect(tooltip._popper).not.toBeNull()
+            expect(tooltip._getTipElement().getAttribute('data-popper-placement')).toEqual('top')
+            resolve()
+          }, 200)
+        }, 10)
 
-      tooltipEl.dispatchEvent(createEvent('mouseover'))
+        tooltipEl.dispatchEvent(createEvent('mouseover'))
+      })
     })
 
-    it('should only trigger inserted event if a new tooltip element was created', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should only trigger inserted event if a new tooltip element was created', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl)
-
-      spyOn(window, 'getComputedStyle').and.returnValue({
-        transitionDuration: '0.15s',
-        transitionDelay: '0s'
-      })
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
 
-      const insertedFunc = jasmine.createSpy()
-      tooltipEl.addEventListener('inserted.bs.tooltip', insertedFunc)
+        spyOn(window, 'getComputedStyle').and.returnValue({
+          transitionDuration: '0.15s',
+          transitionDelay: '0s'
+        })
 
-      setTimeout(() => {
-        expect(insertedFunc).toHaveBeenCalledTimes(1)
-        tooltip.hide()
-
-        setTimeout(() => {
-          tooltip.show()
-        }, 100)
+        const insertedFunc = jasmine.createSpy()
+        tooltipEl.addEventListener('inserted.bs.tooltip', insertedFunc)
 
         setTimeout(() => {
           expect(insertedFunc).toHaveBeenCalledTimes(1)
-          done()
-        }, 200)
-      }, 0)
+          tooltip.hide()
 
-      tooltip.show()
+          setTimeout(() => {
+            tooltip.show()
+          }, 100)
+
+          setTimeout(() => {
+            expect(insertedFunc).toHaveBeenCalledTimes(2)
+            resolve()
+          }, 200)
+        }, 0)
+
+        tooltip.show()
+      })
     })
 
-    it('should show a tooltip with custom class provided in data attributes', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip" data-bs-custom-class="custom-class">'
+    it('should show a tooltip with custom class provided in data attributes', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip" data-bs-custom-class="custom-class"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl)
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
-        const tip = document.querySelector('.tooltip')
-        expect(tip).not.toBeNull()
-        expect(tip.classList.contains('custom-class')).toBeTrue()
-        done()
-      })
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          const tip = document.querySelector('.tooltip')
+          expect(tip).not.toBeNull()
+          expect(tip).toHaveClass('custom-class')
+          resolve()
+        })
 
-      tooltip.show()
+        tooltip.show()
+      })
     })
 
-    it('should show a tooltip with custom class provided as a string in config', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should show a tooltip with custom class provided as a string in config', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl, {
-        customClass: 'custom-class custom-class-2'
-      })
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl, {
+          customClass: 'custom-class custom-class-2'
+        })
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
-        const tip = document.querySelector('.tooltip')
-        expect(tip).not.toBeNull()
-        expect(tip.classList.contains('custom-class')).toBeTrue()
-        expect(tip.classList.contains('custom-class-2')).toBeTrue()
-        done()
-      })
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          const tip = document.querySelector('.tooltip')
+          expect(tip).not.toBeNull()
+          expect(tip).toHaveClass('custom-class')
+          expect(tip).toHaveClass('custom-class-2')
+          resolve()
+        })
 
-      tooltip.show()
+        tooltip.show()
+      })
     })
 
-    it('should show a tooltip with custom class provided as a function in config', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should show a tooltip with custom class provided as a function in config', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip" data-class-a="custom-class-a" data-class-b="custom-class-b"></a>'
 
-      const spy = jasmine.createSpy('customClass').and.returnValue('custom-class')
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl, {
-        customClass: spy
-      })
+        const tooltipEl = fixtureEl.querySelector('a')
+        const spy = jasmine.createSpy('customClass').and.callFake(function (el) {
+          return `${el.dataset.classA} ${this.dataset.classB}`
+        })
+        const tooltip = new Tooltip(tooltipEl, {
+          customClass: spy
+        })
+
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          const tip = document.querySelector('.tooltip')
+          expect(tip).not.toBeNull()
+          expect(spy).toHaveBeenCalled()
+          expect(tip).toHaveClass('custom-class-a')
+          expect(tip).toHaveClass('custom-class-b')
+          resolve()
+        })
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
-        const tip = document.querySelector('.tooltip')
-        expect(tip).not.toBeNull()
-        expect(spy).toHaveBeenCalled()
-        expect(tip.classList.contains('custom-class')).toBeTrue()
-        done()
+        tooltip.show()
       })
+    })
 
-      tooltip.show()
+    it('should remove `title` attribute if exists', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
+
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
+
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          expect(tooltipEl.getAttribute('title')).toBeNull()
+          resolve()
+        })
+        tooltip.show()
+      })
     })
   })
 
   describe('hide', () => {
-    it('should hide a tooltip', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should hide a tooltip', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl)
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => tooltip.hide())
-      tooltipEl.addEventListener('hidden.bs.tooltip', () => {
-        expect(document.querySelector('.tooltip')).toBeNull()
-        expect(tooltipEl.getAttribute('aria-describedby')).toBeNull()
-        done()
-      })
+        tooltipEl.addEventListener('shown.bs.tooltip', () => tooltip.hide())
+        tooltipEl.addEventListener('hidden.bs.tooltip', () => {
+          expect(document.querySelector('.tooltip')).toBeNull()
+          expect(tooltipEl.getAttribute('aria-describedby')).toBeNull()
+          resolve()
+        })
 
-      tooltip.show()
+        tooltip.show()
+      })
     })
 
-    it('should hide a tooltip on mobile', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should hide a tooltip on mobile', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl)
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
+        const spy = spyOn(EventHandler, 'off')
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
-        document.documentElement.ontouchstart = noop
-        spyOn(EventHandler, 'off')
-        tooltip.hide()
-      })
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          document.documentElement.ontouchstart = noop
+          tooltip.hide()
+        })
 
-      tooltipEl.addEventListener('hidden.bs.tooltip', () => {
-        expect(document.querySelector('.tooltip')).toBeNull()
-        expect(EventHandler.off).toHaveBeenCalledWith(jasmine.any(Object), 'mouseover', noop)
-        document.documentElement.ontouchstart = undefined
-        done()
-      })
+        tooltipEl.addEventListener('hidden.bs.tooltip', () => {
+          expect(document.querySelector('.tooltip')).toBeNull()
+          expect(spy).toHaveBeenCalledWith(jasmine.any(Object), 'mouseover', noop)
+          document.documentElement.ontouchstart = undefined
+          resolve()
+        })
 
-      tooltip.show()
+        tooltip.show()
+      })
     })
 
-    it('should hide a tooltip without animation', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should hide a tooltip without animation', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl, {
-        animation: false
-      })
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl, {
+          animation: false
+        })
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => tooltip.hide())
-      tooltipEl.addEventListener('hidden.bs.tooltip', () => {
-        expect(document.querySelector('.tooltip')).toBeNull()
-        expect(tooltipEl.getAttribute('aria-describedby')).toBeNull()
-        done()
-      })
+        tooltipEl.addEventListener('shown.bs.tooltip', () => tooltip.hide())
+        tooltipEl.addEventListener('hidden.bs.tooltip', () => {
+          expect(document.querySelector('.tooltip')).toBeNull()
+          expect(tooltipEl.getAttribute('aria-describedby')).toBeNull()
+          resolve()
+        })
 
-      tooltip.show()
+        tooltip.show()
+      })
     })
 
-    it('should not hide a tooltip if hide event is prevented', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should not hide a tooltip if hide event is prevented', () => {
+      return new Promise((resolve, reject) => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const assertDone = () => {
-        setTimeout(() => {
-          expect(document.querySelector('.tooltip')).not.toBeNull()
-          done()
-        }, 20)
-      }
+        const assertDone = () => {
+          setTimeout(() => {
+            expect(document.querySelector('.tooltip')).not.toBeNull()
+            resolve()
+          }, 20)
+        }
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl, {
-        animation: false
-      })
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl, {
+          animation: false
+        })
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => tooltip.hide())
-      tooltipEl.addEventListener('hide.bs.tooltip', event => {
-        event.preventDefault()
-        assertDone()
-      })
-      tooltipEl.addEventListener('hidden.bs.tooltip', () => {
-        throw new Error('should not trigger hidden event')
-      })
+        tooltipEl.addEventListener('shown.bs.tooltip', () => tooltip.hide())
+        tooltipEl.addEventListener('hide.bs.tooltip', event => {
+          event.preventDefault()
+          assertDone()
+        })
+        tooltipEl.addEventListener('hidden.bs.tooltip', () => {
+          reject(new Error('should not trigger hidden event'))
+        })
 
-      tooltip.show()
+        tooltip.show()
+      })
     })
 
     it('should not throw error running hide if popper hasn\'t been shown', () => {
@@ -956,26 +1069,28 @@ describe('Tooltip', () => {
   })
 
   describe('update', () => {
-    it('should call popper update', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('should call popper update', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl)
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
-        spyOn(tooltip._popper, 'update')
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          const spy = spyOn(tooltip._popper, 'update')
 
-        tooltip.update()
+          tooltip.update()
 
-        expect(tooltip._popper.update).toHaveBeenCalled()
-        done()
-      })
+          expect(spy).toHaveBeenCalled()
+          resolve()
+        })
 
-      tooltip.show()
+        tooltip.show()
+      })
     })
 
     it('should do nothing if the tooltip is not shown', () => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
       const tooltip = new Tooltip(tooltipEl)
@@ -985,140 +1100,122 @@ describe('Tooltip', () => {
     })
   })
 
-  describe('isWithContent', () => {
+  describe('_isWithContent', () => {
     it('should return true if there is content', () => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
       const tooltip = new Tooltip(tooltipEl)
 
-      expect(tooltip.isWithContent()).toEqual(true)
+      expect(tooltip._isWithContent()).toBeTrue()
     })
 
     it('should return false if there is no content', () => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="">'
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title=""></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
       const tooltip = new Tooltip(tooltipEl)
 
-      expect(tooltip.isWithContent()).toEqual(false)
+      expect(tooltip._isWithContent()).toBeFalse()
     })
   })
 
-  describe('getTipElement', () => {
+  describe('_getTipElement', () => {
     it('should create the tip element and return it', () => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
       const tooltip = new Tooltip(tooltipEl)
 
-      spyOn(document, 'createElement').and.callThrough()
+      const spy = spyOn(document, 'createElement').and.callThrough()
 
-      expect(tooltip.getTipElement()).toBeDefined()
-      expect(document.createElement).toHaveBeenCalled()
+      expect(tooltip._getTipElement()).toBeDefined()
+      expect(spy).toHaveBeenCalled()
     })
 
     it('should return the created tip element', () => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
       const tooltip = new Tooltip(tooltipEl)
 
       const spy = spyOn(document, 'createElement').and.callThrough()
 
-      expect(tooltip.getTipElement()).toBeDefined()
+      expect(tooltip._getTipElement()).toBeDefined()
       expect(spy).toHaveBeenCalled()
 
       spy.calls.reset()
 
-      expect(tooltip.getTipElement()).toBeDefined()
+      expect(tooltip._getTipElement()).toBeDefined()
       expect(spy).not.toHaveBeenCalled()
     })
   })
 
   describe('setContent', () => {
     it('should set tip content', () => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
       const tooltip = new Tooltip(tooltipEl, { animation: false })
 
-      const tip = tooltip.getTipElement()
+      const tip = tooltip._getTipElement()
 
       tooltip.setContent(tip)
 
-      expect(tip.classList.contains('show')).toEqual(false)
-      expect(tip.classList.contains('fade')).toEqual(false)
+      expect(tip).not.toHaveClass('show')
+      expect(tip).not.toHaveClass('fade')
       expect(tip.querySelector('.tooltip-inner').textContent).toEqual('Another tooltip')
     })
 
     it('should re-show tip if it was already shown', () => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" data-bs-title="Another tooltip">'
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip" data-bs-title="Another tooltip"></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
       const tooltip = new Tooltip(tooltipEl)
       tooltip.show()
-      const tip = () => tooltip.getTipElement()
+      const tip = () => tooltip._getTipElement()
 
-      expect(tip().classList.contains('show')).toEqual(true)
+      expect(tip()).toHaveClass('show')
       tooltip.setContent({ '.tooltip-inner': 'foo' })
 
-      expect(tip().classList.contains('show')).toEqual(true)
+      expect(tip()).toHaveClass('show')
       expect(tip().querySelector('.tooltip-inner').textContent).toEqual('foo')
     })
 
     it('should keep tip hidden, if it was already hidden before', () => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" data-bs-title="Another tooltip">'
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip" data-bs-title="Another tooltip"></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
       const tooltip = new Tooltip(tooltipEl)
-      const tip = () => tooltip.getTipElement()
+      const tip = () => tooltip._getTipElement()
 
-      expect(tip().classList.contains('show')).toEqual(false)
+      expect(tip()).not.toHaveClass('show')
       tooltip.setContent({ '.tooltip-inner': 'foo' })
 
-      expect(tip().classList.contains('show')).toEqual(false)
-      expect(tip().querySelector('.tooltip-inner').textContent).toEqual('foo')
-    })
-  })
-
-  describe('updateAttachment', () => {
-    it('should use end class name when right placement specified', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
-
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl, {
-        placement: 'right'
-      })
-
-      tooltipEl.addEventListener('inserted.bs.tooltip', () => {
-        expect(tooltip.getTipElement().classList.contains('bs-tooltip-auto')).toEqual(true)
-        done()
-      })
-
+      expect(tip()).not.toHaveClass('show')
       tooltip.show()
+      expect(tip().querySelector('.tooltip-inner').textContent).toEqual('foo')
     })
 
-    it('should use start class name when left placement specified', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+    it('"setContent" should keep the initial template', () => {
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl, {
-        placement: 'left'
-      })
+      const tooltip = new Tooltip(tooltipEl)
 
-      tooltipEl.addEventListener('inserted.bs.tooltip', () => {
-        expect(tooltip.getTipElement().classList.contains('bs-tooltip-auto')).toEqual(true)
-        done()
-      })
+      tooltip.setContent({ '.tooltip-inner': 'foo' })
+      const tip = tooltip._getTipElement()
 
-      tooltip.show()
+      expect(tip).toHaveClass('tooltip')
+      expect(tip).toHaveClass('bs-tooltip-auto')
+      expect(tip.querySelector('.tooltip-arrow')).not.toBeNull()
+      expect(tip.querySelector('.tooltip-inner')).not.toBeNull()
     })
   })
 
   describe('setContent', () => {
     it('should do nothing if the element is null', () => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
       const tooltip = new Tooltip(tooltipEl)
@@ -1130,7 +1227,8 @@ describe('Tooltip', () => {
     it('should do nothing if the content is a child of the element', () => {
       fixtureEl.innerHTML = [
         '<a href="#" rel="tooltip" title="Another tooltip">',
-        '<div id="childContent"></div>'
+        '  <div id="childContent"></div>',
+        '</a>'
       ].join('')
 
       const tooltipEl = fixtureEl.querySelector('a')
@@ -1139,7 +1237,7 @@ describe('Tooltip', () => {
         html: true
       })
 
-      tooltip.getTipElement().append(childContent)
+      tooltip._getTipElement().append(childContent)
       tooltip.setContent({ '.tooltip': childContent })
 
       expect().nothing()
@@ -1148,7 +1246,8 @@ describe('Tooltip', () => {
     it('should add the content as a child of the element for jQuery elements', () => {
       fixtureEl.innerHTML = [
         '<a href="#" rel="tooltip" title="Another tooltip">',
-        '<div id="childContent"></div>'
+        '  <div id="childContent"></div>',
+        '</a>'
       ].join('')
 
       const tooltipEl = fixtureEl.querySelector('a')
@@ -1158,14 +1257,16 @@ describe('Tooltip', () => {
       })
 
       tooltip.setContent({ '.tooltip': { 0: childContent, jquery: 'jQuery' } })
+      tooltip.show()
 
-      expect(childContent.parentNode).toEqual(tooltip.getTipElement())
+      expect(childContent.parentNode).toEqual(tooltip._getTipElement())
     })
 
     it('should add the child text content in the element', () => {
       fixtureEl.innerHTML = [
         '<a href="#" rel="tooltip" title="Another tooltip">',
-        '<div id="childContent">Tooltip</div>'
+        '  <div id="childContent">Tooltip</div>',
+        '</a>'
       ].join('')
 
       const tooltipEl = fixtureEl.querySelector('a')
@@ -1174,11 +1275,11 @@ describe('Tooltip', () => {
 
       tooltip.setContent({ '.tooltip': childContent })
 
-      expect(childContent.textContent).toEqual(tooltip.getTipElement().textContent)
+      expect(childContent.textContent).toEqual(tooltip._getTipElement().textContent)
     })
 
     it('should add html without sanitize it', () => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
       const tooltip = new Tooltip(tooltipEl, {
@@ -1188,11 +1289,11 @@ describe('Tooltip', () => {
 
       tooltip.setContent({ '.tooltip': '<div id="childContent">Tooltip</div>' })
 
-      expect(tooltip.getTipElement().querySelector('div').id).toEqual('childContent')
+      expect(tooltip._getTipElement().querySelector('div').id).toEqual('childContent')
     })
 
     it('should add html sanitized', () => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
       const tooltip = new Tooltip(tooltipEl, {
@@ -1201,35 +1302,35 @@ describe('Tooltip', () => {
 
       const content = [
         '<div id="childContent">',
-        ' <button type="button">test btn</button>',
+        '  <button type="button">test btn</button>',
         '</div>'
       ].join('')
 
       tooltip.setContent({ '.tooltip': content })
-      expect(tooltip.getTipElement().querySelector('div').id).toEqual('childContent')
-      expect(tooltip.getTipElement().querySelector('button')).toEqual(null)
+      expect(tooltip._getTipElement().querySelector('div').id).toEqual('childContent')
+      expect(tooltip._getTipElement().querySelector('button')).toBeNull()
     })
 
     it('should add text content', () => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
       const tooltip = new Tooltip(tooltipEl)
 
       tooltip.setContent({ '.tooltip': 'test' })
 
-      expect(tooltip.getTipElement().textContent).toEqual('test')
+      expect(tooltip._getTipElement().textContent).toEqual('test')
     })
   })
 
-  describe('getTitle', () => {
+  describe('_getTitle', () => {
     it('should return the title', () => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">'
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
       const tooltipEl = fixtureEl.querySelector('a')
       const tooltip = new Tooltip(tooltipEl)
 
-      expect(tooltip.getTitle()).toEqual('Another tooltip')
+      expect(tooltip._getTitle()).toEqual('Another tooltip')
     })
 
     it('should call title function', () => {
@@ -1240,7 +1341,33 @@ describe('Tooltip', () => {
         title: () => 'test'
       })
 
-      expect(tooltip.getTitle()).toEqual('test')
+      expect(tooltip._getTitle()).toEqual('test')
+    })
+
+    it('should call title function with trigger element', () => {
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip" data-foo="bar"></a>'
+
+      const tooltipEl = fixtureEl.querySelector('a')
+      const tooltip = new Tooltip(tooltipEl, {
+        title(el) {
+          return el.dataset.foo
+        }
+      })
+
+      expect(tooltip._getTitle()).toEqual('bar')
+    })
+
+    it('should call title function with correct this value', () => {
+      fixtureEl.innerHTML = '<a href="#" rel="tooltip" data-foo="bar"></a>'
+
+      const tooltipEl = fixtureEl.querySelector('a')
+      const tooltip = new Tooltip(tooltipEl, {
+        title() {
+          return this.dataset.foo
+        }
+      })
+
+      expect(tooltip._getTitle()).toEqual('bar')
     })
   })
 
@@ -1260,60 +1387,85 @@ describe('Tooltip', () => {
 
       const div = fixtureEl.querySelector('div')
 
-      expect(Tooltip.getInstance(div)).toEqual(null)
+      expect(Tooltip.getInstance(div)).toBeNull()
     })
   })
 
   describe('aria-label', () => {
-    it('should add the aria-label attribute for referencing original title', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
+    it('should add the aria-label attribute for referencing original title', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl)
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
-        const tooltipShown = document.querySelector('.tooltip')
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          const tooltipShown = document.querySelector('.tooltip')
 
-        expect(tooltipShown).not.toBeNull()
-        expect(tooltipEl.getAttribute('aria-label')).toEqual('Another tooltip')
-        done()
-      })
+          expect(tooltipShown).not.toBeNull()
+          expect(tooltipEl.getAttribute('aria-label')).toEqual('Another tooltip')
+          resolve()
+        })
 
-      tooltip.show()
+        tooltip.show()
+      })
     })
 
-    it('should not add the aria-label attribute if the attribute already exists', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" aria-label="Different label" title="Another tooltip"></a>'
+    it('should add the aria-label attribute when element text content is a whitespace string', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="A tooltip"><span>    </span></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl)
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
-        const tooltipShown = document.querySelector('.tooltip')
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          const tooltipShown = document.querySelector('.tooltip')
 
-        expect(tooltipShown).not.toBeNull()
-        expect(tooltipEl.getAttribute('aria-label')).toEqual('Different label')
-        done()
-      })
+          expect(tooltipShown).not.toBeNull()
+          expect(tooltipEl.getAttribute('aria-label')).toEqual('A tooltip')
+          resolve()
+        })
 
-      tooltip.show()
+        tooltip.show()
+      })
     })
 
-    it('should not add the aria-label attribute if the element has text content', done => {
-      fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">text content</a>'
+    it('should not add the aria-label attribute if the attribute already exists', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" aria-label="Different label" title="Another tooltip"></a>'
 
-      const tooltipEl = fixtureEl.querySelector('a')
-      const tooltip = new Tooltip(tooltipEl)
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
+
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          const tooltipShown = document.querySelector('.tooltip')
 
-      tooltipEl.addEventListener('shown.bs.tooltip', () => {
-        const tooltipShown = document.querySelector('.tooltip')
+          expect(tooltipShown).not.toBeNull()
+          expect(tooltipEl.getAttribute('aria-label')).toEqual('Different label')
+          resolve()
+        })
 
-        expect(tooltipShown).not.toBeNull()
-        expect(tooltipEl.getAttribute('aria-label')).toBeNull()
-        done()
+        tooltip.show()
       })
+    })
 
-      tooltip.show()
+    it('should not add the aria-label attribute if the element has text content', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" rel="tooltip" title="Another tooltip">text content</a>'
+
+        const tooltipEl = fixtureEl.querySelector('a')
+        const tooltip = new Tooltip(tooltipEl)
+
+        tooltipEl.addEventListener('shown.bs.tooltip', () => {
+          const tooltipShown = document.querySelector('.tooltip')
+
+          expect(tooltipShown).not.toBeNull()
+          expect(tooltipEl.getAttribute('aria-label')).toBeNull()
+          resolve()
+        })
+
+        tooltip.show()
+      })
     })
   })
 
@@ -1334,7 +1486,7 @@ describe('Tooltip', () => {
 
       const div = fixtureEl.querySelector('div')
 
-      expect(Tooltip.getInstance(div)).toEqual(null)
+      expect(Tooltip.getInstance(div)).toBeNull()
       expect(Tooltip.getOrCreateInstance(div)).toBeInstanceOf(Tooltip)
     })
 
@@ -1343,13 +1495,13 @@ describe('Tooltip', () => {
 
       const div = fixtureEl.querySelector('div')
 
-      expect(Tooltip.getInstance(div)).toEqual(null)
+      expect(Tooltip.getInstance(div)).toBeNull()
       const tooltip = Tooltip.getOrCreateInstance(div, {
         title: () => 'test'
       })
       expect(tooltip).toBeInstanceOf(Tooltip)
 
-      expect(tooltip.getTitle()).toEqual('test')
+      expect(tooltip._getTitle()).toEqual('test')
     })
 
     it('should return the instance when exists without given configuration', () => {
@@ -1367,7 +1519,7 @@ describe('Tooltip', () => {
       expect(tooltip).toBeInstanceOf(Tooltip)
       expect(tooltip2).toEqual(tooltip)
 
-      expect(tooltip2.getTitle()).toEqual('nothing')
+      expect(tooltip2._getTitle()).toEqual('nothing')
     })
   })
 
@@ -1405,7 +1557,7 @@ describe('Tooltip', () => {
       const div = fixtureEl.querySelector('div')
       const tooltip = new Tooltip(div)
 
-      spyOn(tooltip, 'show')
+      const spy = spyOn(tooltip, 'show')
 
       jQueryMock.fn.tooltip = Tooltip.jQueryInterface
       jQueryMock.elements = [div]
@@ -1413,7 +1565,7 @@ describe('Tooltip', () => {
       jQueryMock.fn.tooltip.call(jQueryMock, 'show')
 
       expect(Tooltip.getInstance(div)).toEqual(tooltip)
-      expect(tooltip.show).toHaveBeenCalled()
+      expect(spy).toHaveBeenCalled()
     })
 
     it('should throw error on undefined method', () => {