[upgrade] add tests to build process (microsoft#787)

Co-authored-by: Ian Seabock (Centific Technologies Inc) <[email protected]>

.github/workflows/node.js.yml

@@ -31,4 +31,4 @@ jobs:
         cache-dependency-path: '**/package-lock.json'
     - run: npm ci
     - run: npm run build --if-present
-    # - run: npm test
+    - run: npm run test --if-present

frontend/jest.config.ts

@@ -1,9 +1,11 @@
 import type {Config} from '@jest/types';
-// Sync object
+
 const config: Config.InitialOptions = {
   verbose: true,
   transform: {
     '^.+\\.tsx?$': 'ts-jest',
   },
+  setupFilesAfterEnv: ['<rootDir>/polyfills.js'],
 };
-export default config;
+
+export default config;