History
The first commit of what would become RubySpec is recorded in the Rubinius repository on Sat Dec 16 07:55:41 2006 +0000. At that point, Rubinius had only been publicly announced about two months before at RubyConf06 (see a nice summary of Evan's talk). We did not run much code, but Evan had already been writing tests for the development he was doing. The initial spec code was an ape of the unit test harness, which basically created a subprocess for each test method and made assertions on the text output from processing some Ruby code.
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