Welcome back to Metaprogramming with Ruby! In part one we looked at what Metaprogramming is and how it works; we explored deep into the internals of Ruby’s method lookup system and walked through how creating Singleton Classes fits into that mechanism. Now for the good part: applying it all. Mocking objects for testing Some of the most useful features of Ruby’s metaprogramming have been shown off countless times in the vast array of testing frameworks available.
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RubySource: Ruby Metaprogramming: Part II