Increase Test Coverage to >90%

[jdisho]

Problem

SpeziFHIR currently has only 33% test coverage. For a library of this size, we should aim to have at least 90% coverage to make sure things are maintainable.

Solution

First, explore the code coverage at Codecov for SpeziFHIR. Then, write unit tests each component to improve coverage.

• Increase test coverage for FHIRResource and its extensions (Tests FHIRResource and its extensions #28).
• [Add more tasks here]
• ...

Additional context

No response

Code of Conduct

• I agree to follow this project's Code of Conduct and Contributing Guidelines

[jdisho]

I have started writing tests for FHIRResource but I don't have access to create and push to branches. Same for managing this issues (assigning, set labels, etc).

cc: @philippzagar 🙏

[philippzagar]

I have started writing tests for FHIRResource but I don't have access to create and push to branches. Same for managing this issues (assigning, set labels, etc).

cc: @philippzagar 🙏

Thanks for creating the issue! Just gave you access to the repo.