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diff --git a/js/tests/unit/popover.spec.js b/js/tests/unit/popover.spec.js
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+import Popover from '../../src/popover'
+import EventHandler from '../../src/dom/event-handler'
+import { clearFixture, getFixture, jQueryMock } from '../helpers/fixture'
+
+describe('Popover', () => {
+  let fixtureEl
+
+  beforeAll(() => {
+    fixtureEl = getFixture()
+  })
+
+  afterEach(() => {
+    clearFixture()
+
+    const popoverList = document.querySelectorAll('.popover')
+
+    for (const popoverEl of popoverList) {
+      popoverEl.remove()
+    }
+  })
+
+  describe('VERSION', () => {
+    it('should return plugin version', () => {
+      expect(Popover.VERSION).toEqual(jasmine.any(String))
+    })
+  })
+
+  describe('Default', () => {
+    it('should return plugin default config', () => {
+      expect(Popover.Default).toEqual(jasmine.any(Object))
+    })
+  })
+
+  describe('NAME', () => {
+    it('should return plugin name', () => {
+      expect(Popover.NAME).toEqual(jasmine.any(String))
+    })
+  })
+
+  describe('DATA_KEY', () => {
+    it('should return plugin data key', () => {
+      expect(Popover.DATA_KEY).toEqual('bs.popover')
+    })
+  })
+
+  describe('EVENT_KEY', () => {
+    it('should return plugin event key', () => {
+      expect(Popover.EVENT_KEY).toEqual('.bs.popover')
+    })
+  })
+
+  describe('DefaultType', () => {
+    it('should return plugin default type', () => {
+      expect(Popover.DefaultType).toEqual(jasmine.any(Object))
+    })
+  })
+
+  describe('show', () => {
+    it('should show a popover', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" title="Popover" data-bs-content="https://twitter.com/getbootstrap">BS twitter</a>'
+
+        const popoverEl = fixtureEl.querySelector('a')
+        const popover = new Popover(popoverEl)
+
+        popoverEl.addEventListener('shown.bs.popover', () => {
+          expect(document.querySelector('.popover')).not.toBeNull()
+          resolve()
+        })
+
+        popover.show()
+      })
+    })
+
+    it('should set title and content from functions', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#">BS twitter</a>'
+
+        const popoverEl = fixtureEl.querySelector('a')
+        const popover = new Popover(popoverEl, {
+          title: () => 'Bootstrap',
+          content: () => 'loves writing tests （╯°□°）╯︵ ┻━┻'
+        })
+
+        popoverEl.addEventListener('shown.bs.popover', () => {
+          const popoverDisplayed = document.querySelector('.popover')
+
+          expect(popoverDisplayed).not.toBeNull()
+          expect(popoverDisplayed.querySelector('.popover-header').textContent).toEqual('Bootstrap')
+          expect(popoverDisplayed.querySelector('.popover-body').textContent).toEqual('loves writing tests （╯°□°）╯︵ ┻━┻')
+          resolve()
+        })
+
+        popover.show()
+      })
+    })
+
+    it('should show a popover with just content without having header', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#">Nice link</a>'
+
+        const popoverEl = fixtureEl.querySelector('a')
+        const popover = new Popover(popoverEl, {
+          content: 'Some beautiful content :)'
+        })
+
+        popoverEl.addEventListener('shown.bs.popover', () => {
+          const popoverDisplayed = document.querySelector('.popover')
+
+          expect(popoverDisplayed).not.toBeNull()
+          expect(popoverDisplayed.querySelector('.popover-header')).toBeNull()
+          expect(popoverDisplayed.querySelector('.popover-body').textContent).toEqual('Some beautiful content :)')
+          resolve()
+        })
+
+        popover.show()
+      })
+    })
+
+    it('should show a popover with just title without having body', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#">Nice link</a>'
+
+        const popoverEl = fixtureEl.querySelector('a')
+        const popover = new Popover(popoverEl, {
+          title: 'Title which does not require content'
+        })
+
+        popoverEl.addEventListener('shown.bs.popover', () => {
+          const popoverDisplayed = document.querySelector('.popover')
+
+          expect(popoverDisplayed).not.toBeNull()
+          expect(popoverDisplayed.querySelector('.popover-body')).toBeNull()
+          expect(popoverDisplayed.querySelector('.popover-header').textContent).toEqual('Title which does not require content')
+          resolve()
+        })
+
+        popover.show()
+      })
+    })
+
+    it('should show a popover with just title without having body using data-attribute to get config', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" data-bs-content="" title="Title which does not require content">Nice link</a>'
+
+        const popoverEl = fixtureEl.querySelector('a')
+        const popover = new Popover(popoverEl)
+
+        popoverEl.addEventListener('shown.bs.popover', () => {
+          const popoverDisplayed = document.querySelector('.popover')
+
+          expect(popoverDisplayed).not.toBeNull()
+          expect(popoverDisplayed.querySelector('.popover-body')).toBeNull()
+          expect(popoverDisplayed.querySelector('.popover-header').textContent).toEqual('Title which does not require content')
+          resolve()
+        })
+
+        popover.show()
+      })
+    })
+
+    it('should NOT show a popover without `title` and `content`', () => {
+      fixtureEl.innerHTML = '<a href="#" data-bs-content="" title="">Nice link</a>'
+
+      const popoverEl = fixtureEl.querySelector('a')
+      const popover = new Popover(popoverEl, { animation: false })
+      const spy = spyOn(EventHandler, 'trigger').and.callThrough()
+
+      popover.show()
+
+      expect(spy).not.toHaveBeenCalledWith(popoverEl, Popover.eventName('show'))
+      expect(document.querySelector('.popover')).toBeNull()
+    })
+
+    it('"setContent" should keep the initial template', () => {
+      fixtureEl.innerHTML = '<a href="#" title="Popover" data-bs-content="https://twitter.com/getbootstrap" data-bs-custom-class="custom-class">BS twitter</a>'
+
+      const popoverEl = fixtureEl.querySelector('a')
+      const popover = new Popover(popoverEl)
+
+      popover.setContent({ '.tooltip-inner': 'foo' })
+      const tip = popover._getTipElement()
+
+      expect(tip).toHaveClass('popover')
+      expect(tip).toHaveClass('bs-popover-auto')
+      expect(tip.querySelector('.popover-arrow')).not.toBeNull()
+      expect(tip.querySelector('.popover-header')).not.toBeNull()
+      expect(tip.querySelector('.popover-body')).not.toBeNull()
+    })
+
+    it('should call setContent once', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#">BS twitter</a>'
+
+        const popoverEl = fixtureEl.querySelector('a')
+        const popover = new Popover(popoverEl, {
+          content: 'Popover content'
+        })
+        expect(popover._templateFactory).toBeNull()
+        let spy = null
+        let times = 1
+
+        popoverEl.addEventListener('hidden.bs.popover', () => {
+          popover.show()
+        })
+
+        popoverEl.addEventListener('shown.bs.popover', () => {
+          spy = spy || spyOn(popover._templateFactory, 'constructor').and.callThrough()
+          const popoverDisplayed = document.querySelector('.popover')
+
+          expect(popoverDisplayed).not.toBeNull()
+          expect(popoverDisplayed.querySelector('.popover-body').textContent).toEqual('Popover content')
+          expect(spy).toHaveBeenCalledTimes(0)
+          if (times > 1) {
+            resolve()
+          }
+
+          times++
+          popover.hide()
+        })
+        popover.show()
+      })
+    })
+
+    it('should show a popover with provided custom class', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" title="Popover" data-bs-content="https://twitter.com/getbootstrap" data-bs-custom-class="custom-class">BS twitter</a>'
+
+        const popoverEl = fixtureEl.querySelector('a')
+        const popover = new Popover(popoverEl)
+
+        popoverEl.addEventListener('shown.bs.popover', () => {
+          const tip = document.querySelector('.popover')
+          expect(tip).not.toBeNull()
+          expect(tip).toHaveClass('custom-class')
+          resolve()
+        })
+
+        popover.show()
+      })
+    })
+  })
+
+  describe('hide', () => {
+    it('should hide a popover', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<a href="#" title="Popover" data-bs-content="https://twitter.com/getbootstrap">BS twitter</a>'
+
+        const popoverEl = fixtureEl.querySelector('a')
+        const popover = new Popover(popoverEl)
+
+        popoverEl.addEventListener('shown.bs.popover', () => {
+          popover.hide()
+        })
+
+        popoverEl.addEventListener('hidden.bs.popover', () => {
+          expect(document.querySelector('.popover')).toBeNull()
+          resolve()
+        })
+
+        popover.show()
+      })
+    })
+  })
+
+  describe('jQueryInterface', () => {
+    it('should create a popover', () => {
+      fixtureEl.innerHTML = '<a href="#" title="Popover" data-bs-content="https://twitter.com/getbootstrap">BS twitter</a>'
+
+      const popoverEl = fixtureEl.querySelector('a')
+
+      jQueryMock.fn.popover = Popover.jQueryInterface
+      jQueryMock.elements = [popoverEl]
+
+      jQueryMock.fn.popover.call(jQueryMock)
+
+      expect(Popover.getInstance(popoverEl)).not.toBeNull()
+    })
+
+    it('should create a popover with a config object', () => {
+      fixtureEl.innerHTML = '<a href="#" title="Popover">BS twitter</a>'
+
+      const popoverEl = fixtureEl.querySelector('a')
+
+      jQueryMock.fn.popover = Popover.jQueryInterface
+      jQueryMock.elements = [popoverEl]
+
+      jQueryMock.fn.popover.call(jQueryMock, {
+        content: 'Popover content'
+      })
+
+      expect(Popover.getInstance(popoverEl)).not.toBeNull()
+    })
+
+    it('should not re create a popover', () => {
+      fixtureEl.innerHTML = '<a href="#" title="Popover" data-bs-content="https://twitter.com/getbootstrap">BS twitter</a>'
+
+      const popoverEl = fixtureEl.querySelector('a')
+      const popover = new Popover(popoverEl)
+
+      jQueryMock.fn.popover = Popover.jQueryInterface
+      jQueryMock.elements = [popoverEl]
+
+      jQueryMock.fn.popover.call(jQueryMock)
+
+      expect(Popover.getInstance(popoverEl)).toEqual(popover)
+    })
+
+    it('should throw error on undefined method', () => {
+      fixtureEl.innerHTML = '<a href="#" title="Popover" data-bs-content="https://twitter.com/getbootstrap">BS twitter</a>'
+
+      const popoverEl = fixtureEl.querySelector('a')
+      const action = 'undefinedMethod'
+
+      jQueryMock.fn.popover = Popover.jQueryInterface
+      jQueryMock.elements = [popoverEl]
+
+      expect(() => {
+        jQueryMock.fn.popover.call(jQueryMock, action)
+      }).toThrowError(TypeError, `No method named "${action}"`)
+    })
+
+    it('should should call show method', () => {
+      fixtureEl.innerHTML = '<a href="#" title="Popover" data-bs-content="https://twitter.com/getbootstrap">BS twitter</a>'
+
+      const popoverEl = fixtureEl.querySelector('a')
+      const popover = new Popover(popoverEl)
+
+      jQueryMock.fn.popover = Popover.jQueryInterface
+      jQueryMock.elements = [popoverEl]
+
+      const spy = spyOn(popover, 'show')
+
+      jQueryMock.fn.popover.call(jQueryMock, 'show')
+
+      expect(spy).toHaveBeenCalled()
+    })
+  })
+
+  describe('getInstance', () => {
+    it('should return popover instance', () => {
+      fixtureEl.innerHTML = '<a href="#" title="Popover" data-bs-content="https://twitter.com/getbootstrap">BS twitter</a>'
+
+      const popoverEl = fixtureEl.querySelector('a')
+      const popover = new Popover(popoverEl)
+
+      expect(Popover.getInstance(popoverEl)).toEqual(popover)
+      expect(Popover.getInstance(popoverEl)).toBeInstanceOf(Popover)
+    })
+
+    it('should return null when there is no popover instance', () => {
+      fixtureEl.innerHTML = '<a href="#" title="Popover" data-bs-content="https://twitter.com/getbootstrap">BS twitter</a>'
+
+      const popoverEl = fixtureEl.querySelector('a')
+
+      expect(Popover.getInstance(popoverEl)).toBeNull()
+    })
+  })
+
+  describe('getOrCreateInstance', () => {
+    it('should return popover instance', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+      const popover = new Popover(div)
+
+      expect(Popover.getOrCreateInstance(div)).toEqual(popover)
+      expect(Popover.getInstance(div)).toEqual(Popover.getOrCreateInstance(div, {}))
+      expect(Popover.getOrCreateInstance(div)).toBeInstanceOf(Popover)
+    })
+
+    it('should return new instance when there is no popover instance', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+
+      expect(Popover.getInstance(div)).toBeNull()
+      expect(Popover.getOrCreateInstance(div)).toBeInstanceOf(Popover)
+    })
+
+    it('should return new instance when there is no popover instance with given configuration', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+
+      expect(Popover.getInstance(div)).toBeNull()
+      const popover = Popover.getOrCreateInstance(div, {
+        placement: 'top'
+      })
+      expect(popover).toBeInstanceOf(Popover)
+
+      expect(popover._config.placement).toEqual('top')
+    })
+
+    it('should return the instance when exists without given configuration', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+      const popover = new Popover(div, {
+        placement: 'top'
+      })
+      expect(Popover.getInstance(div)).toEqual(popover)
+
+      const popover2 = Popover.getOrCreateInstance(div, {
+        placement: 'bottom'
+      })
+      expect(popover).toBeInstanceOf(Popover)
+      expect(popover2).toEqual(popover)
+
+      expect(popover2._config.placement).toEqual('top')
+    })
+  })
+})