I spent a couple of hours trying to find out why the #obsoleteClasses test sporadically fails. I��ve found one candidate that fixes all the failures that I could produces. Simply put, any test that does something AST related (e.g. runs critics) *has to* reset the ASTCache during #tearDown:

ASTCache reset.

I��ve found two test classes that needed to be adapted: SmalllintManifestCheckerTest and VSReleaseDevelopmentVersionCommandTest.

Issue with slice: https://pharo.fogbugz.com/f/cases/14375/Random-obsoleteClasses-test-failures

Cheers,

Max