With our client we see a big use case of flow unit test rules, as they fulfill the gap between testing individual 'smaller' rules and external tests running your entire case. The only problem is that currently there is a disable condition on the 'create new unit test' button on the flow rule. This disable condition will check for a create stage as part of your case.

We don't exactly know why this restriction was created, but we would really like to not have this restriction in place. With the possibilities of set up data we can 'stub/mock' any start of a flow and any expected result. It would save our client a lot of tests currently done by external tools if we would be able to easily use flow rule unit tests.