test refactor

[Anarak404]

• [x] I checked other issues and ensured that there are no duplicates.

Is your feature request related to a problem? Please describe. generic unit test with predefinied test cases https://github.com/allegro/tradukisto/discussions/136#discussioncomment-7206531

Describe the solution you'd like contributors will need only to complete the list - without copy pasting etc

Additional context Add any other context or screenshots about the feature request here.

[Anarak404]

Hi, @jglaszka 😄 Can you assign me to this issue?

[jglaszka]

done :)

[jglaszka]

Tests POC was merged. We can now rewrite other tests to new solution - I will create separated task for that.

[jglaszka]

https://github.com/allegro/tradukisto/issues/147