- the problems: some tests were just poorly written, using async calls but not properly setting async expectations. Those were generating undefined behaviour (not clear if/when those callbacks would be executed).
- also, we wanted to call `clearAllCaches` before every test, but since some methods there are async, this doesn't work with the way `setUp` was designed. So basically sometimes before a test we could clear the cache but sometimes not, or even the clear could come while running the test which was worst
- decided to fix this by making sure after every test that we manually clear what we have added.
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