chore(ckeditor5-math): initialize empty plugin

packages/ckeditor5-math/tests/math.ts

@@ -0,0 +1,56 @@
+import { describe, expect, it, beforeEach, afterEach } from 'vitest';
+import { ClassicEditor, Essentials, Paragraph, Heading } from 'ckeditor5';
+import Math from '../src/math.js';
+
+describe( 'Math', () => {
+	it( 'should be named', () => {
+		expect( Math.pluginName ).to.equal( 'Math' );
+	} );
+
+	describe( 'init()', () => {
+		let domElement: HTMLElement, editor: ClassicEditor;
+
+		beforeEach( async () => {
+			domElement = document.createElement( 'div' );
+			document.body.appendChild( domElement );
+
+			editor = await ClassicEditor.create( domElement, {
+				licenseKey: 'GPL',
+				plugins: [
+					Paragraph,
+					Heading,
+					Essentials,
+					Math
+				],
+				toolbar: [
+					'math'
+				]
+			} );
+		} );
+
+		afterEach( () => {
+			domElement.remove();
+			return editor.destroy();
+		} );
+
+		it( 'should load Math', () => {
+			const myPlugin = editor.plugins.get( 'Math' );
+
+			expect( myPlugin ).to.be.an.instanceof( Math );
+		} );
+
+		it( 'should add an icon to the toolbar', () => {
+			expect( editor.ui.componentFactory.has( 'math' ) ).to.equal( true );
+		} );
+
+		it( 'should add a text into the editor after clicking the icon', () => {
+			const icon = editor.ui.componentFactory.create( 'math' );
+
+			expect( editor.getData() ).to.equal( '' );
+
+			icon.fire( 'execute' );
+
+			expect( editor.getData() ).to.equal( '<p>Hello CKEditor 5!</p>' );
+		} );
+	} );
+} );