fixing tests for changed bookmark

jest/setup.js

@@ -4,7 +4,8 @@ import Adapter from 'enzyme-adapter-react-16';
 Enzyme.configure({ adapter: new Adapter() });
 
 Object.defineProperty(document, 'readyState', {
-  val: 'complete',
-  get() { return this.val; },
-  set(s) { this.val = s; },
+  value: 'complete',
+  writable: true,
+  enumerable: true,
+  configurable: true,
 });