Test: Added test for checking if attribute is not lost when compositi…

…on replaces text.

tests/tickets/188.js

@@ -0,0 +1,63 @@
+/**
+ * @license Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
+ * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
+ */
+
+import VirtualTestEditor from '@ckeditor/ckeditor5-core/tests/_utils/virtualtesteditor';
+import Input from '../../src/input';
+import Paragraph from '@ckeditor/ckeditor5-paragraph/src/paragraph';
+import BoldEditing from '@ckeditor/ckeditor5-basic-styles/src/bold/boldediting';
+
+import { getData } from '@ckeditor/ckeditor5-engine/src/dev-utils/view';
+
+describe( 'Bug ckeditor5-typing#188', () => {
+	let editor;
+
+	beforeEach( () => {
+		return VirtualTestEditor.create( {
+			plugins: [ Input, Paragraph, BoldEditing ]
+		} ).then( newEditor => {
+			editor = newEditor;
+		} );
+	} );
+
+	afterEach( () => {
+		return editor.destroy();
+	} );
+
+	it( 'should not lost attributes while typing - IME', () => {
+		const view = editor.editing.view;
+		const p = view.document.getRoot().getChild( 0 );
+
+		editor.execute( 'bold' );
+
+		simulateMutation( view, p, 0, 0, '', 'u' );
+
+		expect( getData( view, { withoutSelection: true } ) ).to.equal( '<p><strong>u</strong></p>' );
+
+		simulateMutation( view, p, 0, 1, 'u', 'ü' );
+
+		expect( getData( view, { withoutSelection: true } ) ).to.equal( '<p><strong>ü</strong></p>' );
+	} );
+} );
+
+function simulateMutation( view, node, startOffset, endOffset, oldText, newText ) {
+	const viewSelection = view.createSelection();
+
+	viewSelection.setTo( view.createRange(
+		view.createPositionAt( node, startOffset ),
+		view.createPositionAt( node, endOffset )
+	) );
+
+	view.document.fire( 'mutations',
+		[
+			{
+				type: 'text',
+				oldText,
+				newText,
+				node
+			}
+		],
+		viewSelection
+	);
+}