Test all components with unit tests

[Stezido]

• [ ] The feature was discussed in discussions of this repository.
• [ ] I have searched the issues of this repository and believe that this is not a duplicate.

Description 💡

For some componpents we already implemented unit test. The goal is to implement unit tests in each component and for each case at least 1 positiv and 1 negative., so that we at least cover each file if possible and if it makes sense

Discussion-reference: <Insert discussion reference here>