The Alexa evangelist team built a simulation tool called TestFlow to streamline skill debugging and testing. You can use the tool to test your skill code without needing to package or deploy your project. TestFlow is a lightweight, command-line dialog simulator. It displays and maintains the details of a mock skill session. Whenever you want to run a test, you just Alt-Tab to a command prompt, run TestFlow, review results, and then Alt-Tab right back to developing.