polyfill missing crypto function for tests

Author: 4upz

plugins/backend/src/setupTests.ts

@@ -2,4 +2,10 @@
  * © 2022 Thoughtworks, Inc.
  */
 
-export {}
+import crypto from 'crypto'
+
+Object.defineProperty(global, 'crypto', {
+  value: {
+    getRandomValues: (arr: any) => crypto.randomBytes(arr.length),
+  },
+})