fix: unit tests for caching + frame test position

[napisani]

Hi again 👋

Im raising a second PR because my other pr is failing CI checks due to a regression (but not one created by my changes). It seems like these tests started failing after commit: 0fbdecc
#212

Im jumping in late but from what i can tell there has recently been some changes caching here is what this pr does:

1. adjust the assertion for the it_calculates_the_visible_frame test so it matches the new actual position values
2. it marks the cache as dirty before testing that refresh() returns empty descriptors and uuid lists