simple-test is a simple REBOL testing framework. It uses the same overall approach as RUnit (which can be found in the REBOL.org script library). The main differences between simple-test and RUnit are:
There are no restrictions on test filenames;
Only the code being tested is timed, not the assertion as well;
There is more flexibility for setup and teardown code;
There are more Rebolish assertions such as assert unset.
It runs under both REBOL 2 and the REBOL 3 Alpha
Though due to a bug in the REBOL 3 Alpha (curecode ticket #1361), simple-test is not currently able to trap all script errors in REBOL 3.
simple-test is an off-shoot of a higher-level testing framework that I have been working on with Gregg Irwin. In future, I hope to fold simple-test back into that framework as its underlying testing engine. I would like to thank Gregg for his contribution.
For more info please read the Simple Test Docs