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/usr/lib/ruby/vendor_ruby/shoulda/matchers/action_controller/filter_param_matcher.rb is in ruby-shoulda-matchers 1.0.0~beta2-1build1.

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module Shoulda # :nodoc:
  module Matchers
    module ActionController # :nodoc:

      # Ensures that filter_parameter_logging is set for the specified key.
      #
      # Example:
      #
      #   it { should filter_param(:password) }
      def filter_param(key)
        FilterParamMatcher.new(key)
      end

      class FilterParamMatcher # :nodoc:

        def initialize(key)
          @key = key.to_s
        end

        def matches?(controller)
          @controller = controller
          filters_key?
        end

        def failure_message
          "Expected #{@key} to be filtered; filtered keys: #{filtered_keys.join(', ')}"
        end

        def negative_failure_message
          "Did not expect #{@key} to be filtered"
        end

        def description
          "filter #{@key}"
        end

        private

        def filters_key?
          filtered_keys.include?(@key)
        end

        def filtered_keys
          Rails.application.config.filter_parameters.map { |filter| filter.to_s }
        end
      end

    end
  end
end