[Technical debt] Comprehensive project tests

[yurvon-screamo]

Why do we need this improvement?

The tests of the project in their current form are chaotic and do not provide the proper level of verification.

How will this change help?

We can guarantee the quality of the manufactured product

Screenshots

No response

How could it be implemented/designed?

• Divide the project into layers
• Determine the test requirements for each layer of the project
• Implement the tests!

🚧 Breaking changes

No

👀 Have you checked for similar open issues?

• I checked and didn't find a similar issue

🏢 Have you read the Contributing Guidelines?

• I have read the Contributing Guidelines

Are you willing to work on this issue?

Yes I am willing to submit a PR!