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diff --git a/js/tests/unit/util/backdrop.spec.js b/js/tests/unit/util/backdrop.spec.js
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+import Backdrop from '../../../src/util/backdrop'
+import { getTransitionDurationFromElement } from '../../../src/util/index'
+import { clearFixture, getFixture } from '../../helpers/fixture'
+
+const CLASS_BACKDROP = '.modal-backdrop'
+const CLASS_NAME_FADE = 'fade'
+const CLASS_NAME_SHOW = 'show'
+
+describe('Backdrop', () => {
+  let fixtureEl
+
+  beforeAll(() => {
+    fixtureEl = getFixture()
+  })
+
+  afterEach(() => {
+    clearFixture()
+    const list = document.querySelectorAll(CLASS_BACKDROP)
+
+    for (const el of list) {
+      el.remove()
+    }
+  })
+
+  describe('show', () => {
+    it('should append the backdrop html once on show and include the "show" class if it is "shown"', () => {
+      return new Promise(resolve => {
+        const instance = new Backdrop({
+          isVisible: true,
+          isAnimated: false
+        })
+        const getElements = () => document.querySelectorAll(CLASS_BACKDROP)
+
+        expect(getElements()).toHaveSize(0)
+
+        instance.show()
+        instance.show(() => {
+          expect(getElements()).toHaveSize(1)
+          for (const el of getElements()) {
+            expect(el).toHaveClass(CLASS_NAME_SHOW)
+          }
+
+          resolve()
+        })
+      })
+    })
+
+    it('should not append the backdrop html if it is not "shown"', () => {
+      return new Promise(resolve => {
+        const instance = new Backdrop({
+          isVisible: false,
+          isAnimated: true
+        })
+        const getElements = () => document.querySelectorAll(CLASS_BACKDROP)
+
+        expect(getElements()).toHaveSize(0)
+        instance.show(() => {
+          expect(getElements()).toHaveSize(0)
+          resolve()
+        })
+      })
+    })
+
+    it('should append the backdrop html once and include the "fade" class if it is "shown" and "animated"', () => {
+      return new Promise(resolve => {
+        const instance = new Backdrop({
+          isVisible: true,
+          isAnimated: true
+        })
+        const getElements = () => document.querySelectorAll(CLASS_BACKDROP)
+
+        expect(getElements()).toHaveSize(0)
+
+        instance.show(() => {
+          expect(getElements()).toHaveSize(1)
+          for (const el of getElements()) {
+            expect(el).toHaveClass(CLASS_NAME_FADE)
+          }
+
+          resolve()
+        })
+      })
+    })
+  })
+
+  describe('hide', () => {
+    it('should remove the backdrop html', () => {
+      return new Promise(resolve => {
+        const instance = new Backdrop({
+          isVisible: true,
+          isAnimated: true
+        })
+
+        const getElements = () => document.body.querySelectorAll(CLASS_BACKDROP)
+
+        expect(getElements()).toHaveSize(0)
+        instance.show(() => {
+          expect(getElements()).toHaveSize(1)
+          instance.hide(() => {
+            expect(getElements()).toHaveSize(0)
+            resolve()
+          })
+        })
+      })
+    })
+
+    it('should remove the "show" class', () => {
+      return new Promise(resolve => {
+        const instance = new Backdrop({
+          isVisible: true,
+          isAnimated: true
+        })
+        const elem = instance._getElement()
+
+        instance.show()
+        instance.hide(() => {
+          expect(elem).not.toHaveClass(CLASS_NAME_SHOW)
+          resolve()
+        })
+      })
+    })
+
+    it('should not try to remove Node on remove method if it is not "shown"', () => {
+      return new Promise(resolve => {
+        const instance = new Backdrop({
+          isVisible: false,
+          isAnimated: true
+        })
+        const getElements = () => document.querySelectorAll(CLASS_BACKDROP)
+        const spy = spyOn(instance, 'dispose').and.callThrough()
+
+        expect(getElements()).toHaveSize(0)
+        expect(instance._isAppended).toBeFalse()
+        instance.show(() => {
+          instance.hide(() => {
+            expect(getElements()).toHaveSize(0)
+            expect(spy).not.toHaveBeenCalled()
+            expect(instance._isAppended).toBeFalse()
+            resolve()
+          })
+        })
+      })
+    })
+
+    it('should not error if the backdrop no longer has a parent', () => {
+      return new Promise(resolve => {
+        fixtureEl.innerHTML = '<div id="wrapper"></div>'
+
+        const wrapper = fixtureEl.querySelector('#wrapper')
+        const instance = new Backdrop({
+          isVisible: true,
+          isAnimated: true,
+          rootElement: wrapper
+        })
+
+        const getElements = () => document.querySelectorAll(CLASS_BACKDROP)
+
+        instance.show(() => {
+          wrapper.remove()
+          instance.hide(() => {
+            expect(getElements()).toHaveSize(0)
+            resolve()
+          })
+        })
+      })
+    })
+  })
+
+  describe('click callback', () => {
+    it('should execute callback on click', () => {
+      return new Promise(resolve => {
+        const spy = jasmine.createSpy('spy')
+
+        const instance = new Backdrop({
+          isVisible: true,
+          isAnimated: false,
+          clickCallback: () => spy()
+        })
+        const endTest = () => {
+          setTimeout(() => {
+            expect(spy).toHaveBeenCalled()
+            resolve()
+          }, 10)
+        }
+
+        instance.show(() => {
+          const clickEvent = new Event('mousedown', { bubbles: true, cancelable: true })
+          document.querySelector(CLASS_BACKDROP).dispatchEvent(clickEvent)
+          endTest()
+        })
+      })
+    })
+
+    describe('animation callbacks', () => {
+      it('should show and hide backdrop after counting transition duration if it is animated', () => {
+        return new Promise(resolve => {
+          const instance = new Backdrop({
+            isVisible: true,
+            isAnimated: true
+          })
+          const spy2 = jasmine.createSpy('spy2')
+
+          const execDone = () => {
+            setTimeout(() => {
+              expect(spy2).toHaveBeenCalledTimes(2)
+              resolve()
+            }, 10)
+          }
+
+          instance.show(spy2)
+          instance.hide(() => {
+            spy2()
+            execDone()
+          })
+          expect(spy2).not.toHaveBeenCalled()
+        })
+      })
+
+      it('should show and hide backdrop without a delay if it is not animated', () => {
+        return new Promise(resolve => {
+          const spy = jasmine.createSpy('spy', getTransitionDurationFromElement)
+          const instance = new Backdrop({
+            isVisible: true,
+            isAnimated: false
+          })
+          const spy2 = jasmine.createSpy('spy2')
+
+          instance.show(spy2)
+          instance.hide(spy2)
+
+          setTimeout(() => {
+            expect(spy2).toHaveBeenCalled()
+            expect(spy).not.toHaveBeenCalled()
+            resolve()
+          }, 10)
+        })
+      })
+
+      it('should not call delay callbacks if it is not "shown"', () => {
+        return new Promise(resolve => {
+          const instance = new Backdrop({
+            isVisible: false,
+            isAnimated: true
+          })
+          const spy = jasmine.createSpy('spy', getTransitionDurationFromElement)
+
+          instance.show()
+          instance.hide(() => {
+            expect(spy).not.toHaveBeenCalled()
+            resolve()
+          })
+        })
+      })
+    })
+
+    describe('Config', () => {
+      describe('rootElement initialization', () => {
+        it('should be appended on "document.body" by default', () => {
+          return new Promise(resolve => {
+            const instance = new Backdrop({
+              isVisible: true
+            })
+            const getElement = () => document.querySelector(CLASS_BACKDROP)
+            instance.show(() => {
+              expect(getElement().parentElement).toEqual(document.body)
+              resolve()
+            })
+          })
+        })
+
+        it('should find the rootElement if passed as a string', () => {
+          return new Promise(resolve => {
+            const instance = new Backdrop({
+              isVisible: true,
+              rootElement: 'body'
+            })
+            const getElement = () => document.querySelector(CLASS_BACKDROP)
+            instance.show(() => {
+              expect(getElement().parentElement).toEqual(document.body)
+              resolve()
+            })
+          })
+        })
+
+        it('should be appended on any element given by the proper config', () => {
+          return new Promise(resolve => {
+            fixtureEl.innerHTML = '<div id="wrapper"></div>'
+
+            const wrapper = fixtureEl.querySelector('#wrapper')
+            const instance = new Backdrop({
+              isVisible: true,
+              rootElement: wrapper
+            })
+            const getElement = () => document.querySelector(CLASS_BACKDROP)
+            instance.show(() => {
+              expect(getElement().parentElement).toEqual(wrapper)
+              resolve()
+            })
+          })
+        })
+      })
+
+      describe('ClassName', () => {
+        it('should allow configuring className', () => {
+          return new Promise(resolve => {
+            const instance = new Backdrop({
+              isVisible: true,
+              className: 'foo'
+            })
+            const getElement = () => document.querySelector('.foo')
+            instance.show(() => {
+              expect(getElement()).toEqual(instance._getElement())
+              instance.dispose()
+              resolve()
+            })
+          })
+        })
+      })
+    })
+  })
+})