I'm currently using test/unit, and I'm considering using rspec. However, I've noticed that rspec currently doesn't support heckle in ruby 1.9.1, and doesn't support passing any parameters to heckle apart from the target module/class/method.
Are there any other current problems with using heckle and rspec, or do they work well together apart from those two issues?
Also, if I stay with test/unit for the moment, should I consider using it with cucumber?
Edit: The 1.9.1 issue isn't rspec's fault - heckle can't run on ruby 1.9.1 because parsetree can't run on ruby 1.9.1.
The last time I checked, Heckle+RSpec didn't work very well, and I don't think many people are using them together.
Back in the spring 2008 I looked into this and noticed that RSpec and Heckle hadn't been working together at all for some time. I made a patch and it was accepted into RSpec 1.1.14. Even after those changes, I didn't find Heckle very usable. If I remember correctly the problem is that Heckle itself crashes with non-trivial programs.
It is really a pity that the situation is what it is. If you want to help, you may want to look at the boo-hiss project: http://github.com/halorgium/boo_hiss/tree/master .
Update: After a two-year hiatus, a new version of Heckle (Heckle 1.4.2) was released last week. Maybe this has fixed the problems I experienced.