Shaves off a few seconds off unit tests by loading the images just once
Refactors unit tests so that the resulting images are actually tested
Changes unit tests to use FluentAssertions and tests a bunch more stuff
Resets the image factories each time the collection is called
Refactors the huge copypastas with nicer loops
Fixes background color unit test
Adds unit test for boostrapper
Renames unit test methods