The Redis test suite is still written in Tcl: https://news.ycombinator.com/item?id=9963162 (although more recently antirez said somewhere he wished he'd written it in C for speed)
My understanding it's a reference to Steve Coogan, who played Alan Partridge, who in one episode sees a friend called Dan, and starts shouting his name, but Dan doesn't react. Alan proceeds shouting: Dan! Dan! DAN! and eventually gives up. This scene was later parodied in a BBC programme about animals, where one animal shouts Alan! Alan! ALAN! and then realises the name's wrong: STEVE!
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