Refactor and add unit tests

Add more unit tests for functions in videostream.js

Author: ddd999

package-lock.json

@@ -75,7 +75,9 @@
     "npm-run-all": "^4.1.5",
     "pino-colada": "^2.2.2",
     "pino-http": "^10.3.0",
-    "should": "^13.2.3"
+    "should": "^13.2.3",
+    "sinon": "^19.0.2",
+    "sinon-chai": "^3.7.0"
   },
   "nyc": {
     "all": true,