To mount the env of automatized tests

[Junior Erdmann Streichan]

Used links:

• https://stackoverflow.com/questions/13607732/in-memory-mongodb-for-test?noredirect=1&lq=1
• https://github.com/Rocketseat/youtube-nodejs-tdd-jest
• https://www.youtube.com/watch?v=2G_mWfG0DZE
• https://github.com/nodkz/mongodb-memory-server

[Junior Erdmann Streichan]

Issue migrated from Trello