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rspec カスタムマッチャー

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以下のようなことがしたいときに使う。

it { 1.should greater_than 0 }

RSpec::Matchers::defineを利用する。

RSpec::Matchers.define :greater_than do |expected|
  match {|actual| actual > expected }
end

see: https://www.relishapp.com/rspec/rspec-expectations/v/2-12/docs/custom-matchers/define-matcher

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