The other day my dad showed me a copy of my BSc. dissertation that he's had in a folder somewhere since 1992. I remembered vaguely that it was about drawing trees and plants using L-Systems to describe the structures and Logo to render them, but had no strong memory of what I actually did. Flipping through it, I saw that I learned enough C , yacc , lex , and Postscript to cobble an implementation together and that the trees, although only greyscale line drawings, could model aspects of natural growth patterns in a convincing way. A pleasant trip down memory lane, for sure, until a what the ...? moment as I came across a (short) section on testing. I have no recollection of learning testing at university and there are no testing resources in my bibliography. Did I just make it up as I went along? Well, as we all know, anyone can test, so I thought I'd look at what approaches the anyone who was the callow me tried. I pulled out evidence from the brief text, trying not to ov