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+This is a Doom source port regression testing system that uses the
+thousands of demos in the
+[Compet-N archive](https://doomwiki.org/wiki/Compet-n) to test demo
+playback. It was developed for Chocolate Doom but it may be useful for
+other source ports as well.
+
+The demos have been played back in vanilla Doom running in
+[statdump.exe](https://github.com/fragglet/vanilla-utilities)
+to save statistics about the levels that were completed. The output
+from statdump.exe (in the form of .txt files) gives a useful set of
+expected outputs. A source port able to output the same statistics
+data can then be tested by playing back the same demos and comparing
+against this expected data set.
+
+See [the Chocolate Doom
+website](https://www.chocolate-doom.org/wiki/index.php/Statcheck) for
+details about how to run the test suite.
+