Keeping Fed - ;TLDR

We also want to counteract our pets getting hungry.

Your challenge in this step is to give the Pet function a feed method that decreases it's hunger level.

• calling feed should decrease the Pet's hunger level by 3.

• A pet's hunger level should never go below 0.

To complete this challenge, you will need to:

• test the expected behaviour in the Node CLI

• write unit tests to to cover the expected behaviour

• implement the code to make the tests pass

• refactor your code

Once you are done, commit your work and push to GitHub.