File: with_env_macro.rb

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module Support
  module WithEnvMacro

    module ClassMethods

      def with_env(new)
        old = Hash[new.map{|k, v| [k, ENV[k]]}]

        before { ENV.update(new) }
        after  { ENV.update(old) }
      end

    end

    private

    def self.included(base)
      base.extend(ClassMethods)
    end

  end
end