How to use the @remirror/core-extensions.CodeBlockExtension function in @remirror/core-extensions

test('ReactSerializer.fromExtensionManager', () => {
  expect(serializer).toBeInstanceOf(ReactSerializer);
  expect(serializer.nodes.paragraph).toBeFunction();
  expect(serializer.marks.bold).toBeFunction();

  // fills in for a missing text
  const altExtensions = [
    { extension: new DocExtension(), priority: 2 },
    { extension: new ParagraphExtension(), priority: 2 },
    { extension: new TextExtension(), priority: 2 },
    { extension: new BoldExtension(), priority: 2 },
    { extension: new CodeBlockExtension(), priority: 2 },
  ];
  const altManager = ExtensionManager.create(altExtensions);
  expect(ReactSerializer.fromExtensionManager(altManager).nodes.text).toBeFunction();
});