text: /**
   * @license Copyright (c) 2003-2022, CKSource - Frederico Knabben. All rights reserved.
   * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
   */
  
  /* global document, Event */
  
  import { keyCodes } from '@ckeditor/ckeditor5-utils/src/keyboard';
  import TextAlternativeFormView from '../../../src/imagetextalternative/ui/textalternativeformview';
  import View from '@ckeditor/ckeditor5-ui/src/view';
  import KeystrokeHandler from '@ckeditor/ckeditor5-utils/src/keystrokehandler';
  import FocusTracker from '@ckeditor/ckeditor5-utils/src/focustracker';
  import FocusCycler from '@ckeditor/ckeditor5-ui/src/focuscycler';
  import ViewCollection from '@ckeditor/ckeditor5-ui/src/viewcollection';
  import testUtils from '@ckeditor/ckeditor5-core/tests/_utils/utils';
  
  describe( 'TextAlternativeFormView', () => {
  	let view;
  
  	testUtils.createSinonSandbox();
  
  	beforeEach( () => {
  		view = new TextAlternativeFormView( { t: () => {} } );
  	} );
  
  	describe( 'constructor()', () => {
  		it( 'should create element from template', () => {
  			view.render();
  
  			expect( view.element.classList.contains( 'ck' ) ).to.be.true;
  			expect( view.element.classList.contains( 'ck-text-alternative-form' ) ).to.be.true;
  			expect( view.element.classList.contains( 'ck-responsive-form' ) ).to.be.true;
  			expect( view.element.getAttribute( 'tabindex' ) ).to.equal( '-1' );
  		} );
  
  		it( 'should create #focusTracker instance', () => {
  			expect( view.focusTracker ).to.be.instanceOf( FocusTracker );
  		} );
  
  		it( 'should create #keystrokes instance', () => {
  			expect( view.keystrokes ).to.be.instanceOf( KeystrokeHandler );
  		} );
  
  		it( 'should create child views', () => {
  			expect( view.labeledInput ).to.be.instanceOf( View );
  			expect( view.saveButtonView ).to.be.instanceOf( View );
  			expect( view.cancelButtonView ).to.be.instanceOf( View );
  
  			view.render();
  
  			expect( view.saveButtonView.element.classList.contains( 'ck-button-save' ) ).to.be.true;
  			expect( view.cancelButtonView.element.classList.contains( 'ck-button-cancel' ) ).to.be.true;
  		} );
  
  		it( 'should create #_focusCycler instance', () => {
  			expect( view._focusCycler ).to.be.instanceOf( FocusCycler );
  		} );
  
  		it( 'should create #_focusables view collection', () => {
  			expect( view._focusables ).to.be.instanceOf( ViewCollection );
  		} );
  
  		it( 'should fire `cancel` event on cancelButtonView#execute', () => {
  			const spy = sinon.spy();
  			view.on( 'cancel', spy );
  			view.cancelButtonView.fire( 'execute' );
  
  			sinon.assert.calledOnce( spy );
  		} );
  
  		it( 'should implement the CSS transition disabling feature', () => {
  			expect( view.disableCssTransitions ).to.be.a( 'function' );
  		} );
  	} );
  
  	describe( 'render()', () => {
  		it( 'starts listening for #keystrokes coming from #element', () => {
  			const spy = sinon.spy( view.keystrokes, 'listenTo' );
  
  			view.render();
  			sinon.assert.calledOnce( spy );
  			sinon.assert.calledWithExactly( spy, view.element );
  		} );
  
  		describe( 'focus cycling and management', () => {
  			it( 'should register child views in #_focusables', () => {
  				view.render();
  
  				expect( view._focusables.map( f => f ) ).to.have.members( [
  					view.labeledInput,
  					view.saveButtonView,
  					view.cancelButtonView
  				] );
  			} );
  
  			it( 'should register child views\' #element in #focusTracker', () => {
  				const spy = testUtils.sinon.spy( view.focusTracker, 'add' );
  
  				view.render();
  
  				sinon.assert.calledWithExactly( spy.getCall( 0 ), view.labeledInput.element );
  				sinon.assert.calledWithExactly( spy.getCall( 1 ), view.saveButtonView.element );
  				sinon.assert.calledWithExactly( spy.getCall( 2 ), view.cancelButtonView.element );
  			} );
  
  			describe( 'activates keyboard navigation in the form', () => {
  				beforeEach( () => {
  					view.render();
  					document.body.appendChild( view.element );
  				} );
  
  				afterEach( () => {
  					view.element.remove();
  					view.destroy();
  				} );
  
  				it( 'so "tab" focuses the next focusable item', () => {
  					const keyEvtData = {
  						keyCode: keyCodes.tab,
  						preventDefault: sinon.spy(),
  						stopPropagation: sinon.spy()
  					};
  
  					// Mock the url input is focused.
  					view.focusTracker.isFocused = true;
  					view.focusTracker.focusedElement = view.labeledInput.element;
  
  					const spy = sinon.spy( view.saveButtonView, 'focus' );
  
  					view.keystrokes.press( keyEvtData );
  					sinon.assert.calledOnce( keyEvtData.preventDefault );
  					sinon.assert.calledOnce( keyEvtData.stopPropagation );
  					sinon.assert.calledOnce( spy );
  				} );
  
  				it( 'so "shift + tab" focuses the previous focusable item', () => {
  					const keyEvtData = {
  						keyCode: keyCodes.tab,
  						shiftKey: true,
  						preventDefault: sinon.spy(),
  						stopPropagation: sinon.spy()
  					};
  
  					// Mock the cancel button is focused.
  					view.focusTracker.isFocused = true;
  					view.focusTracker.focusedElement = view.cancelButtonView.element;
  
  					const spy = sinon.spy( view.saveButtonView, 'focus' );
  
  					view.keystrokes.press( keyEvtData );
  					sinon.assert.calledOnce( keyEvtData.preventDefault );
  					sinon.assert.calledOnce( keyEvtData.stopPropagation );
  					sinon.assert.calledOnce( spy );
  				} );
  			} );
  		} );
  	} );
  
  	describe( 'destroy()', () => {
  		it( 'should destroy the FocusTracker instance', () => {
  			const destroySpy = sinon.spy( view.focusTracker, 'destroy' );
  
  			view.destroy();
  
  			sinon.assert.calledOnce( destroySpy );
  		} );
  
  		it( 'should destroy the KeystrokeHandler instance', () => {
  			const destroySpy = sinon.spy( view.keystrokes, 'destroy' );
  
  			view.destroy();
  
  			sinon.assert.calledOnce( destroySpy );
  		} );
  	} );
  
  	describe( 'DOM bindings', () => {
  		describe( 'submit event', () => {
  			it( 'should trigger submit event', () => {
  				const spy = sinon.spy();
  
  				view.render();
  				view.on( 'submit', spy );
  				view.element.dispatchEvent( new Event( 'submit' ) );
  
  				expect( spy.calledOnce ).to.true;
  			} );
  		} );
  	} );
  } );
  