fix(jsdom): cumulative Jest updates with support for TextEncoder/TextDecoder (#8111)

config/jest/jest.unit.config.js

@@ -2,16 +2,18 @@ const path = require('path');
 
 module.exports = {
   rootDir: path.join(__dirname, '..', '..'),
-  testEnvironment: 'jsdom',
+  testEnvironment: 'jest-environment-jsdom',
   testMatch: [
     '**/test/unit/*.js?(x)',
     '**/test/unit/**/*.js?(x)',
   ],
+  setupFiles: ['<rootDir>/test/unit/jest-shim.js'],
   setupFilesAfterEnv: ['<rootDir>/test/unit/setup.js'],
   testPathIgnorePatterns: [
     '<rootDir>/node_modules/',
     '<rootDir>/test/build-artifacts/',
     '<rootDir>/test/mocha',
+    '<rootDir>/test/unit/jest-shim.js',
     '<rootDir>/test/unit/setup.js',
     '<rootDir>/test/unit/xss/anchor-target-rel/online-validator-badge.jsx',
     '<rootDir>/test/unit/components/online-validator-badge.jsx',