MM-52213 webapp/platform/components : Add unit test framework (#23366)

webapp/platform/components/package.json

@@ -7,6 +7,7 @@
   "scripts": {
     "build": "rollup -c",
     "run": "rollup -c --watch",
+    "test": "cross-env TZ=Etc/UTC jest",
     "clean": "rm -rf dist node_modules tsconfig.tsbuildinfo .rollup.cache"
   },
   "devDependencies": {