Fix tests for legacy API

[hellais]

• Delete the unused round_robin function and the functional test for it Move the function into the unittest to use it as test

• Do not hardcode analysis outcomes in integration tests Checking for hardcoded int values for analysis is very brittle, since the analysis might change (as it has) and all the numbers need to be manually updated.

Instead we check for reasonable ranges of values that are less likely to change in the future.