I just want to chime in here with support for dataset. But I'd rather
not have to maintain it.
Dataset is great because it does database specific dumps and loads of
the data after it's generated. That makes it a really fast fixture
replacement.
Radiant's test suite grew to rely on it in unnecessary ways so that we
ate away that speed.
The downside is that the project is not maintained, and almost nobody
else uses it. It's not up to date with the latest rails/rspec/cucumber
versions. If anyone were to jump on to maintain that project, I think
it would be great. But in the interest of keeping Radiant moving
forward, we should avoid the baggage of an out of date dependency.