Seth Vargo • 1/12/2013

Unit Testing Correctly

This technical article critiques a flawed approach to unit testing in Ruby, using a web scraper class as an example. It argues that tests involving network calls and file I/O are slow, unreliable integration tests. The author defines true unit testing, emphasizes isolating the 'universe' under test, and provides a refactored example using test doubles (mocks and stubs) for dependencies like URI and Net::HTTP.

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#unit testing #test isolation #software quality