test: use waitsfor package

Author: aminya

package.json

@@ -84,7 +84,8 @@
     "rollup-plugin-atomic": "^2.3.1",
     "shx": "^0.3.3",
     "temp": "^0.9.4",
-    "typescript": "^4.2.4"
+    "typescript": "^4.2.4",
+    "waitsfor": "^0.0.6"
   },
   "prettier": "prettier-config-atomic"
 }