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+/**
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+ * @license Copyright (c) 2003-2016, CKSource - Frederico Knabben. All rights reserved.
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+ * For licensing, see LICENSE.md.
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+ */
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+
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+/* global document, Event */
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+
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+import FocusTracker from '/ckeditor5/utils/focustracker.js';
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+import CKEditorError from '/ckeditor5/utils/ckeditorerror.js';
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+import testUtils from '/tests/core/_utils/utils.js';
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+
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+testUtils.createSinonSandbox();
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+
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+describe( 'FocusTracker', () => {
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+ let focusTracker, container, containerFirstInput, containerSecondInput;
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+
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+ beforeEach( () => {
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+ container = document.createElement( 'div' );
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+ containerFirstInput = document.createElement( 'input' );
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+ containerSecondInput = document.createElement( 'input' );
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+
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+ container.appendChild( containerFirstInput );
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+ container.appendChild( containerSecondInput );
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+
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+ testUtils.sinon.useFakeTimers();
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+
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+ focusTracker = new FocusTracker();
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+ } );
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+
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+ describe( 'constructor', () => {
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+ describe( 'isFocused', () => {
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+ it( 'should be false at default', () => {
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+ expect( focusTracker.isFocused ).to.false;
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+ } );
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+
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+ it( 'should be observable', () => {
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+ const observableSpy = testUtils.sinon.spy();
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+
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+ focusTracker.listenTo( focusTracker, 'change:isFocused', observableSpy );
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+
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+ focusTracker.isFocused = true;
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+
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+ expect( observableSpy.calledOnce ).to.true;
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+ } );
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+ } );
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+ } );
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+
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+ describe( 'add', () => {
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+ it( 'should throw an error when element has been already added', () => {
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+ focusTracker.add( containerFirstInput );
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+
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+ expect( () => {
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+ focusTracker.add( containerFirstInput );
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+ } ).to.throw( CKEditorError, /focusTracker-add-element-already-exist/ );
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+ } );
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+
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+ describe( 'single element', () => {
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+ it( 'should start listening on element focus and update `isFocused` property', () => {
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+ focusTracker.add( containerFirstInput );
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+
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+ expect( focusTracker.isFocused ).to.false;
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+
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+ containerFirstInput.dispatchEvent( new Event( 'focus' ) );
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+
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+ expect( focusTracker.isFocused ).to.true;
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+ } );
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+
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+ it( 'should start listening on element blur and update `isFocused` property', () => {
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+ focusTracker.add( containerFirstInput );
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+ focusTracker.isFocused = true;
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+
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+ containerFirstInput.dispatchEvent( new Event( 'blur' ) );
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+ testUtils.sinon.clock.tick( 0 );
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+
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+ expect( focusTracker.isFocused ).to.false;
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+ } );
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+ } );
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+
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+ describe( 'container element', () => {
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+ it( 'should start listening on element focus using event capturing and update `isFocused` property', () => {
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+ focusTracker.add( container );
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+
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+ expect( focusTracker.isFocused ).to.false;
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+
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+ containerFirstInput.dispatchEvent( new Event( 'focus' ) );
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+
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+ expect( focusTracker.isFocused ).to.true;
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+ } );
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+
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+ it( 'should start listening on element blur using event capturing and update `isFocused` property', () => {
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+ focusTracker.add( container );
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+ focusTracker.isFocused = true;
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+
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+ containerFirstInput.dispatchEvent( new Event( 'blur' ) );
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+ testUtils.sinon.clock.tick( 0 );
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+
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+ expect( focusTracker.isFocused ).to.false;
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+ } );
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+
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+ it( 'should not change `isFocused` property when focus is going between child elements', () => {
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+ const changeSpy = testUtils.sinon.spy();
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+
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+ focusTracker.add( container );
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+
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+ containerFirstInput.dispatchEvent( new Event( 'focus' ) );
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+
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+ focusTracker.listenTo( focusTracker, 'change:isFocused', changeSpy );
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+
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+ expect( focusTracker.isFocused ).to.true;
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+
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+ containerFirstInput.dispatchEvent( new Event( 'blur' ) );
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+ containerSecondInput.dispatchEvent( new Event( 'focus' ) );
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+ testUtils.sinon.clock.tick( 0 );
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+
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+ expect( focusTracker.isFocused ).to.true;
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+ expect( changeSpy.notCalled ).to.true;
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+ } );
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+ } );
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+ } );
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+
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+ describe( 'remove', () => {
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+ it( 'should do nothing when element was not added', () => {
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+ expect( () => {
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+ focusTracker.remove( container );
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+ } ).to.not.throw();
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+ } );
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+
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+ it( 'should stop listening on element focus', () => {
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+ focusTracker.add( containerFirstInput );
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+ focusTracker.remove( containerFirstInput );
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+
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+ containerFirstInput.dispatchEvent( new Event( 'focus' ) );
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+
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+ expect( focusTracker.isFocused ).to.false;
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+ } );
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+
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+ it( 'should stop listening on element blur', () => {
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+ focusTracker.add( containerFirstInput );
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+ focusTracker.remove( containerFirstInput );
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+ focusTracker.isFocused = true;
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+
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+ containerFirstInput.dispatchEvent( new Event( 'blur' ) );
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+ testUtils.sinon.clock.tick( 0 );
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+
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+ expect( focusTracker.isFocused ).to.true;
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+ } );
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+
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+ it( 'should blur element before removing when is focused', () => {
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+ focusTracker.add( containerFirstInput );
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+ containerFirstInput.dispatchEvent( new Event( 'focus' ) );
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+
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+ expect( focusTracker.isFocused ).to.true;
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+
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+ focusTracker.remove( containerFirstInput );
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+ testUtils.sinon.clock.tick( 0 );
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+
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+ expect( focusTracker.isFocused ).to.false;
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+ } );
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+ } );
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+} );
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