Wow! I was surprised when I looked at the current poll and found it to be my earlier suggestion. Just-wow.
My original reason for the idea was that I had started myself a small project in late January: I wanted to write something to standardize the abbreviations used in a lengthy list of customer addresses where I work. I started with a listing of US Postal Service abbreviations, and began writing expressions to check for common variations and replace them. In doing so, I realized I could use the Test::* framework to generate tests to make sure none of the patterns I had created were too lax or too aggressive, plus it would give me a reason to play with testing, something that I too have not done as much of as I should. When my generated count of tests exceeded 1.0e4, I began to wonder how many tests others had created/generated/written, and thus the question I posted. (As for the project, I ran out of to-its with a full 10+ minute run of the tests (exceeding 5.8e5, including, at that point, 9 failures), probably several dozen expressions left to write, and the eventual intent to try my hand at morphing it into some kind of usable module.)