Run "npx yarn upgrade"

This updates to a more recent version of Jest, which will also bring
in jsdom 14+. In turn, this requires further adjustments when 
overriding methods from "window.location".

Author: amotl

jest.config.js

@@ -0,0 +1,8 @@
+// This file is needed because it is used by vscode and other tools that
+// call `jest` directly.  However, unless you are doing anything special
+// do not edit this file
+
+const standard = require('@grafana/toolkit/src/config/jest.plugin.config');
+
+// This process will use the same config that `yarn test` is using
+module.exports = standard.jestConfig();

src/worldmap.test.ts

@@ -602,10 +602,18 @@ describe('WorldmapFoundation', () => {
 });
 
 function setupInteractionMocks() {
+  /*
+   * Mock window.location methods.
+   * https://remarkablemark.org/blog/2018/11/17/mock-window-location/
+   */
+  delete window.location;
+  // @ts-ignore
+  window.location = {};
+
   // Setup interaction mock for "window.location.assign".
-  // https://remarkablemark.org/blog/2018/11/17/mock-window-location/
   Object.defineProperty(window.location, 'assign', {
     configurable: true,
+    writable: true,
   });
   window.location.assign = jest.fn();