Description

Add different kinds of tests to the project

Requirement Description

Add unit tests to your Chirp! CLI app.
- Add unit tests for suitable functionality. For example, conversion of UNIX timestamps to user readable times and similar functionality are good candidates for unit testing.
Add integration tests that test your CSV database library works as intended.
- For example, add a test case that checks that an entry can be received from the database after it was stored in there.
Add two end-to-end tests that test your Chirp! CLI app:
- For example, you want to test that given example data from chirp_cli_db.csv calling chirp read 10 from the command line produces output as in the following:
```
ropf @ 08/01/23 14:09:20: Hello, BDSA students!
rnie @ 08/02/23 14:19:38: Welcome to the course!
rnie @ 08/02/23 14:37:38: I hope you had a good summer.
ropf @ 08/02/23 15:04:47: Cheeping cheeps on Chirp :)
```
- Additionally, you want to test that calling chirp cheep "Hello!!!" stores the respective values in the database.
  Acceptence criteria
  
  Add the following tests to the project
[x] Unit test
[x] Integration Test
[x] Atleast two end-to-end tests