Test: Merging two x-wr-timezone calendars with different timezones

[niccokunzmann]

Is your feature request related to a problem? Please describe.

X-WR-TIMEZONE is considered but what happens if we have two different timezones?
This should be tackled after #318

Describe alternatives you've considered

Hm. Nothing really.

Additional context

No response

Code of Conduct

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

Are you willing to resolve this issue by submitting a Pull Request?

• Yes, I have the time, and I know how to start.
• Yes, I have the time, but I don't know how to start. I would need guidance.
• No, I don't have the time, although I believe I could do it if I had the time...
• No, I don't have the time and I wouldn't even know how to start.