Define fetch on jsdom window

Fixes codesandbox#1861

Author: CompuIves

packages/app/src/sandbox/eval/tests/jest-lite.ts

@@ -122,8 +122,9 @@ export default class TestRunner {
     const { window: jsdomWindow } = this.dom;
     const { document: jsdomDocument } = jsdomWindow;
 
-    // Date is not set correctly on window in JSDOM. This breaks Jest
+    // Set the modules that are not set on JSDOM
     jsdomWindow.Date = Date;
+    jsdomWindow.fetch = fetch;
 
     return {
       ...jestTestHooks,