Done
Task 1 is done using JavaScript's built in function filter
Task 2:
- added module.exports to remove syntactical errors
- removed the async keyword from postMessagesList() as we are using then() promise.
- updated put() from the messagsMap to set()
- added httpStatus.OK code for the successful response in the end
Pending:
- Mocking the database for the integration testing using sinon spies
- Testing promises using chai expect (unit testing)