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diff --git a/js/src/util/index.spec.js b/js/src/util/index.spec.js
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+import * as Util from './index'
+
+/** Test helpers */
+import { getFixture, clearFixture } from '../../tests/helpers/fixture'
+
+describe('Util', () => {
+  let fixtureEl
+
+  beforeAll(() => {
+    fixtureEl = getFixture()
+  })
+
+  afterEach(() => {
+    clearFixture()
+  })
+
+  describe('getUID', () => {
+    it('should generate uid', () => {
+      const uid = Util.getUID('bs')
+      const uid2 = Util.getUID('bs')
+
+      expect(uid).not.toEqual(uid2)
+    })
+  })
+
+  describe('getSelectorFromElement', () => {
+    it('should get selector from data-target', () => {
+      fixtureEl.innerHTML = [
+        '<div id="test" data-target=".target"></div>',
+        '<div class="target"></div>'
+      ].join('')
+
+      const testEl = fixtureEl.querySelector('#test')
+
+      expect(Util.getSelectorFromElement(testEl)).toEqual('.target')
+    })
+
+    it('should get selector from href if no data-target set', () => {
+      fixtureEl.innerHTML = [
+        '<a id="test" href=".target"></a>',
+        '<div class="target"></div>'
+      ].join('')
+
+      const testEl = fixtureEl.querySelector('#test')
+
+      expect(Util.getSelectorFromElement(testEl)).toEqual('.target')
+    })
+
+    it('should get selector from href if data-target equal to #', () => {
+      fixtureEl.innerHTML = [
+        '<a id="test" data-target="#" href=".target"></a>',
+        '<div class="target"></div>'
+      ].join('')
+
+      const testEl = fixtureEl.querySelector('#test')
+
+      expect(Util.getSelectorFromElement(testEl)).toEqual('.target')
+    })
+
+    it('should return null if selector not found', () => {
+      fixtureEl.innerHTML = '<a id="test" href=".target"></a>'
+
+      const testEl = fixtureEl.querySelector('#test')
+
+      expect(Util.getSelectorFromElement(testEl)).toBeNull()
+    })
+  })
+
+  describe('getTransitionDurationFromElement', () => {
+    it('should get transition from element', () => {
+      fixtureEl.innerHTML = '<div style="transition: all 300ms ease-out;"></div>'
+
+      expect(Util.getTransitionDurationFromElement(fixtureEl.querySelector('div'))).toEqual(300)
+    })
+
+    it('should return 0 if the element is undefined or null', () => {
+      expect(Util.getTransitionDurationFromElement(null)).toEqual(0)
+      expect(Util.getTransitionDurationFromElement(undefined)).toEqual(0)
+    })
+
+    it('should return 0 if the element do not possess transition', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      expect(Util.getTransitionDurationFromElement(fixtureEl.querySelector('div'))).toEqual(0)
+    })
+  })
+
+  describe('triggerTransitionEnd', () => {
+    it('should trigger transitionend event', done => {
+      fixtureEl.innerHTML = '<div style="transition: all 300ms ease-out;"></div>'
+
+      const el = fixtureEl.querySelector('div')
+
+      el.addEventListener('transitionend', () => {
+        expect().nothing()
+        done()
+      })
+
+      Util.triggerTransitionEnd(el)
+    })
+  })
+
+  describe('isElement', () => {
+    it('should detect if the parameter is an element or not', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const el = document.querySelector('div')
+
+      expect(Util.isElement(el)).toEqual(el.nodeType)
+      expect(Util.isElement({})).toEqual(undefined)
+    })
+
+    it('should detect jQuery element', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const el = document.querySelector('div')
+      const fakejQuery = {
+        0: el
+      }
+
+      expect(Util.isElement(fakejQuery)).toEqual(el.nodeType)
+    })
+  })
+
+  describe('emulateTransitionEnd', () => {
+    it('should emulate transition end', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const el = document.querySelector('div')
+      const spy = spyOn(window, 'setTimeout')
+
+      Util.emulateTransitionEnd(el, 10)
+      expect(spy).toHaveBeenCalled()
+    })
+
+    it('should not emulate transition end if already triggered', done => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const el = fixtureEl.querySelector('div')
+      const spy = spyOn(el, 'removeEventListener')
+
+      Util.emulateTransitionEnd(el, 10)
+      Util.triggerTransitionEnd(el)
+
+      setTimeout(() => {
+        expect(spy).toHaveBeenCalled()
+        done()
+      }, 20)
+    })
+  })
+
+  describe('typeCheckConfig', () => {
+    it('should check type of the config object', () => {
+      const namePlugin = 'collapse'
+      const defaultType = {
+        toggle: 'boolean',
+        parent: '(string|element)'
+      }
+      const config = {
+        toggle: true,
+        parent: 777
+      }
+
+      expect(() => {
+        Util.typeCheckConfig(namePlugin, config, defaultType)
+      }).toThrow(new Error('COLLAPSE: Option "parent" provided type "number" but expected type "(string|element)".'))
+    })
+  })
+
+  describe('makeArray', () => {
+    it('should convert node list to array', () => {
+      const nodeList = document.querySelectorAll('div')
+
+      expect(Array.isArray(nodeList)).toEqual(false)
+      expect(Array.isArray(Util.makeArray(nodeList))).toEqual(true)
+    })
+
+    it('should return an empty array if the nodeList is undefined', () => {
+      expect(Util.makeArray(null)).toEqual([])
+      expect(Util.makeArray(undefined)).toEqual([])
+    })
+  })
+
+  describe('isVisible', () => {
+    it('should return false if the element is not defined', () => {
+      expect(Util.isVisible(null)).toEqual(false)
+      expect(Util.isVisible(undefined)).toEqual(false)
+    })
+
+    it('should return false if the element provided is not a dom element', () => {
+      expect(Util.isVisible({})).toEqual(false)
+    })
+
+    it('should return false if the element is not visible with display none', () => {
+      fixtureEl.innerHTML = '<div style="display: none;"></div>'
+
+      const div = fixtureEl.querySelector('div')
+
+      expect(Util.isVisible(div)).toEqual(false)
+    })
+
+    it('should return false if the element is not visible with visibility hidden', () => {
+      fixtureEl.innerHTML = '<div style="visibility: hidden;"></div>'
+
+      const div = fixtureEl.querySelector('div')
+
+      expect(Util.isVisible(div)).toEqual(false)
+    })
+
+    it('should return false if the parent element is not visible', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+
+      expect(Util.isVisible(div)).toEqual(false)
+    })
+
+    it('should return true if the element is visible', () => {
+      fixtureEl.innerHTML = [
+        '<div>',
+        '  <div id="element"></div>',
+        '</div>'
+      ].join('')
+
+      const div = fixtureEl.querySelector('#element')
+
+      expect(Util.isVisible(div)).toEqual(true)
+    })
+  })
+
+  describe('findShadowRoot', () => {
+    it('should return null if shadow dom is not available', () => {
+      // Only for newer browsers
+      if (!document.documentElement.attachShadow) {
+        expect().nothing()
+        return
+      }
+
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+
+      spyOn(document.documentElement, 'attachShadow').and.returnValue(null)
+
+      expect(Util.findShadowRoot(div)).toEqual(null)
+    })
+
+    it('should return null when we do not find a shadow root', () => {
+      // Only for newer browsers
+      if (!document.documentElement.attachShadow) {
+        expect().nothing()
+        return
+      }
+
+      spyOn(document, 'getRootNode').and.returnValue(undefined)
+
+      expect(Util.findShadowRoot(document)).toEqual(null)
+    })
+
+    it('should return the shadow root when found', () => {
+      // Only for newer browsers
+      if (!document.documentElement.attachShadow) {
+        expect().nothing()
+        return
+      }
+
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+      const shadowRoot = div.attachShadow({
+        mode: 'open'
+      })
+
+      expect(Util.findShadowRoot(shadowRoot)).toEqual(shadowRoot)
+
+      shadowRoot.innerHTML = '<button>Shadow Button</button>'
+
+      expect(Util.findShadowRoot(shadowRoot.firstChild)).toEqual(shadowRoot)
+    })
+  })
+
+  describe('noop', () => {
+    it('should return a function', () => {
+      expect(typeof Util.noop()).toEqual('function')
+    })
+  })
+
+  describe('reflow', () => {
+    it('should return element offset height to force the reflow', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+
+      expect(Util.reflow(div)).toEqual(0)
+    })
+  })
+})