add test for watch

package.json

@@ -13,7 +13,7 @@
  "invoke": "npm run build && sam local invoke --event event.json",
  "test": "npm run eslint",
  "execute": "babel-node src/index.js",
- "watch": "nodemon --exec npm run execute"
+ "watch": "TEST=true nodemon --exec npm run execute"
  },
  "keywords": [],
  "author": "",