Added unit tests

[Patryk-MM]

No description provided.

[TheCSharpAcademy]

@Patryk-MM Project approved! 😄✅ And well done for completing the challenges! 👏 I love the UI/UX. Super smooth and user friendly. You leveraged Spectre Console really well. And you also added unit tests! 🤩

Feedback
🔍️It's good practice to handle errors for every operation, particularly I/O ones such as third-party integrations. A good test is to try to send an e-mail without credentials. Instead of crashing, it would be good to show a meaningful message to the user and let the app keep running:

🔍The README says the app uses User Secrets for the database connection string, but the DbContext currently has a hardcoded SQL Server connection string in OnConfiguring. It would be better to inject configuration into the context and read the connection string from configuration/user secrets consistently. Better yet, have a look into the Options pattern for configuration, as it's recommended by Microsoft and it's widely adopted in the industry.

🧑‍🏫Overall well done! 👏👏✋🏻Looking forward to seeing your next projects!