Ask HN: Do you write unit/integration tests for both versions of A/B tests?

We're using integration tests to cover 90% of the user flows. Adding integration tests for all a/b test flows and their permutations seems to be an overkill, but we're facing situations in which there are broken things only when the user is in b version of the test X and b version of the test Y. I'm wondering how other smaller companies deal with this?