message: fixed test error
diff: "options": {
  "outputPath": "dist/frontend",
  "index": "src/index.html",
  - "main": "src/main.ts",
  - "polyfills": "src/polyfills.ts",
  + "polyfills": ["zone.js", "zone.js/testing"],
  "tsConfig": "src/tsconfig.app.json",
  "assets": [
  "src/assets"
  