HackerTube / Video
Ruby Conf 12 - Boundaries by Gary Bernhardt
Confreaks
Gary Bernhardt's RubyConf 2012 talk on testing in isolation without mocking everything. It goes through behavior versus data, mutation versus immutability, and how a functional core with an imperative shell yields natural isolation and parallelism.
HN recommends it as the canonical presentation of 'functional core, imperative shell' and a practical answer to unit versus integration testing.
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