in reply to
What is the largest number of tests you have created for a single project you have worked on?
$ prove t/library/past*.t
t/library/pastpattern.t ............. ok
t/library/pasttransformer.t ......... ok
t/library/pasttransformerdynamic.t .. ok
t/library/pastwalker.t .............. ok
t/library/pastwalkerdynamic.t ....... ok
All tests successful.
Files=5, Tests=2161, 18 wallclock secs ( 0.38 usr 0.05 sys + 16.40 cusr 0.66 csys = 17.49 CPU)
2,161 as of right now. That number is probably about to go up significantly as I've recently re-factored the code in question a lot, and I haven't written new tests for some of the new functionality.
It's Not Quite a Perl project, although it is a Not Quite Perl 6 project. It's a optimization and analysis framework, originally for Parrot Abstract Syntax Trees(which Parrot's Compiler Tools framework uses), but now rather easy to extend to any tree-like data structure.