A few folks are confused by the various release numbers being announced or discussed all at one time, so I thought I'd clarify:
As I've worked on NUnit 2.4 and its follow-ups, I have begun to feel that it's time for a much more significant update to NUnit, a rethinking of what it's all about and how it should work. Of course, at the same time, I don't want to lose all the work that has gone into NUnit up to now. Puzzling over this, and helped by a group of dedicated NUnit users and contributors, I think I now have a direction to go.
While NUnit 2.4 was in development, I continued to maintain the NUnit 2.2 series as a stable, bug-fix-only branch. NUnit 2.2.10 was the last in that series.
When running under .NET 2.0, NUnit is rather slow at loading tests these days. Although many folks only noticed the slowdown with the release of NUnit 2.4, loading a large set of tests with NUnit 2.2 also takes more time - about twice as much - under .NET 2.0 as .NET 1.1.
NUnit is currently built under five different runtimes on Windows - plus two on Linux. Each build is tested under the same runtime on which it was built and on a number of the other runtimes. That's a lot of TestResult files.
NUnit 2.4.2 is out and available here. It includes additions to the new constraint-based Assert syntax and new attributes to facilitate testing under various culture settings. The gui has been enhanced to save the visual state of the tree, including the currently selected test, and to allow loading just the fixture you are working on, which saves a great deal of time on reloads.
I just released NUnit 2.4. It fixes a few issues that slipped into the 2.4 release an makes some minor improvements. I wanted to get this release out because I'll be travelling for a few months and won't be in a position to do further releases until July or August.
Although NUnit 2.4 is almost out the door, there were a few outstanding bug fixes to the NUnit 2.2 series hanging around, so I decided to issue a final 2.2 release. Like all the releases since NUnit 2.2.4, this is primarily a bug fix release.
NUnit 2.4 RC2 is out now, correcting a naming conflict with several mock object frameworks that was present in RC1. You can download it at NUnit.org. For a full list of the extensive new features in NUnit 2.4, check out the Release Notes.