Increase Test Coverage

### What

We should increase our Test Coverage in some areas where it is currently lacking.
We have some scripts / files that have a rather low test coverage (or are not tested at all).
This should be fixed as best as possible

### Acceptance Criteria (DoD)

Better test coverage than currently:
No more 'red' coverages in any files or folders

### How

Write more tests.

Start by reviewing the repository's scripts and files with low or missing coverage, using the coverage report shown in the issue to identify gaps. Add tests for the identified areas and rerun the project's coverage checks; done means no red coverage areas remain.

Written by the indexing model from the issue text.