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@@ -0,0 +1,67 @@
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+/**
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+ * @license Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
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+ * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
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+ */
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+
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+/* global document */
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+
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+import secureSourceElement from '../../../src/editor/utils/securesourceelement';
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+import Editor from '../../../src/editor/editor';
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+import { expectToThrowCKEditorError } from '@ckeditor/ckeditor5-utils/tests/_utils/utils';
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+
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+describe( 'secureSourceElement()', () => {
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+ let editor, sourceElement;
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+
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+ beforeEach( () => {
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+ class CustomEditor extends Editor {}
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+
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+ sourceElement = document.createElement( 'div' );
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+ editor = new CustomEditor();
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+
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+ editor.sourceElement = sourceElement;
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+ editor.state = 'ready';
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+ } );
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+
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+ afterEach( () => {
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+ if ( editor ) {
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+ return editor.destroy();
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+ }
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+ } );
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+
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+ it( 'does not throw if the editor was not initialized using the source element', () => {
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+ delete editor.sourceElement;
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+
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+ expect( () => {
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+ secureSourceElement( editor );
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+ } ).to.not.throw();
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+ } );
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+
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+ it( 'does not throw if the editor was initialized using the element for the first time', () => {
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+ expect( () => {
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+ secureSourceElement( editor );
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+ } ).to.not.throw();
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+ } );
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+
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+ it( 'sets the property after initializing the editor', () => {
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+ secureSourceElement( editor );
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+
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+ expect( sourceElement.ckeditorInstance ).to.equal( editor );
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+ } );
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+
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+ it( 'removes the property after destroying the editor', () => {
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+ secureSourceElement( editor );
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+
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+ return editor.destroy()
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+ .then( () => {
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+ expect( sourceElement.ckeditorInstance ).to.be.undefined;
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+ } );
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+ } );
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+
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+ it( 'throws an error if the same element was used twice', () => {
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+ sourceElement.ckeditorInstance = 'foo';
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+
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+ expectToThrowCKEditorError( () => {
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+ secureSourceElement( editor );
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+ }, /^editor-source-element-already-used/, editor );
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+ } );
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+} );
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