tests/add-tests-exchange

[felipegs31]

added whitelist and nfts contracts to be able to unit test, removed waffle following https://hardhat.org/hardhat-runner/docs/guides/migrating-from-hardhat-waffle, added exchange unit tests, removed unused contracts and scripts

I am practicing how to write good unit tests for contracts, feedbacks are welcome =) If this content is good, I would be more than happy to add some steps to the readme on my thought process

[yanukadeneth99]

Wow, this is great work @felipegs31.

But since this repo is dependent to the course in the README, I'm not sure about making such a drastic change. However, there's a community testing course that's currently underway in LW3. These kinda tests are SUPER helpful there.

Do check the document below :

Link to the Document