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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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+'use strict';
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+
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+import Editor from '/ckeditor5/core/editor.js';
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+import Command from '/ckeditor5/core/command.js';
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+
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+let element, editor, command;
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+
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+class CommandWithSchema extends Command {
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+ constructor( editor, schemaFails ) {
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+ super( editor );
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+
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+ this.schemaFails = schemaFails;
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+ }
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+
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+ checkSchema() {
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+ return this.schemaFails;
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+ }
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+}
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+
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+beforeEach( () => {
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+ element = document.createElement( 'div' );
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+ document.body.appendChild( element );
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+
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+ editor = new Editor( element );
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+ command = new Command( editor );
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+} );
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+
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+describe( 'constructor', () => {
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+ it( 'should create a new command instance, that is enabled and bound to given editor', () => {
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+ expect( command ).to.have.property( 'editor' ).equal( editor );
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+ expect( command.isEnabled ).to.be.true;
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+ } );
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+
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+ it( 'Command should have execute method', () => {
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+ expect( command ).to.have.property( 'execute' );
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+ expect( typeof command.execute ).to.equal( 'function' );
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+ } );
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+
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+ it( 'should add listener to its checkEnabled event if checkSchema method is present', () => {
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+ sinon.spy( command, 'checkSchema' );
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+ command.checkEnabled();
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+
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+ expect( command.checkSchema.called ).to.be.false;
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+
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+ let newCommand = new CommandWithSchema( editor, false );
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+ sinon.spy( newCommand, 'checkSchema' );
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+
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+ newCommand.checkEnabled();
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+
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+ expect( newCommand.checkSchema.calledOnce ).to.be.true;
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+ } );
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+} );
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+
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+describe( 'checkEnabled', () => {
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+ it( 'should fire checkEnabled event', () => {
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+ let spy = sinon.spy();
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+
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+ command.on( 'checkEnabled', spy );
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+ command.checkEnabled();
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+
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+ expect( spy.called ).to.be.true;
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+ } );
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+
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+ it( 'should set isEnabled property to the value returned by last event callback', () => {
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+ command.on( 'checkEnabled', () => {
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+ return true;
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+ } );
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+
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+ command.on( 'checkEnabled', ( evt ) => {
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+ evt.stop();
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+
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+ return false;
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+ } );
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+
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+ command.on( 'checkEnabled', () => {
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+ return true;
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+ } );
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+
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+ command.checkEnabled();
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+
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+ expect( command.isEnabled ).to.be.false;
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+ } );
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+} );
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+
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+describe( 'disable', () => {
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+ it( 'should make command disabled', () => {
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+ command._disable();
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+
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+ expect( command.isEnabled ).to.be.false;
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+ } );
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+
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+ it( 'should not make command disabled if there is a high-priority listener forcing command to be enabled', () => {
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+ command.on( 'checkEnabled', ( evt ) => {
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+ evt.stop();
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+
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+ return true;
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+ }, command, 1 );
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+
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+ command._disable();
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+
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+ expect( command.isEnabled ).to.be.true;
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+ } );
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+} );
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+
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+describe( 'enable', () => {
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+ it( 'should make command enabled if it was previously disabled by disable()', () => {
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+ command._disable();
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+ command._enable();
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+
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+ expect( command.isEnabled ).to.be.true;
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+ } );
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+
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+ it( 'should not make command enabled if there are other listeners disabling it', () => {
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+ command._disable();
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+
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+ command.on( 'checkEnabled', ( evt ) => {
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+ evt.stop();
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+
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+ return false;
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+ } );
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+
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+ command.checkEnabled();
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+ command._enable();
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+
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+ expect( command.isEnabled ).to.be.false;
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+ } );
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+} );
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