Mostly, I'm running individual tests cases or the entire test suite. Thankfully, the bundled test harness (tcltest) is quite similar to Test::Harness and friends and not overly abstracted like JUnit.
The main problem I'm having is that whenever I'm ready to run a test, my brane is hard wired to try to do this:
$ perl all.tcl ## or 'make test'
$ perl 03_general.t
...instead of this:
$ tclsh8.4 all.tcl
$ tclsh8.4 03_general.test