Contents

require 'diff/lcs'

module RSpec
  module Matchers
    def have_different_contents(expected)
      Matcher.new :have_different_contents, expected do |*_expected|
        match_for_should do |actual|
          perform_match(actual, _expected)
        end

        match_for_should_not do |actual|
          !perform_match(actual, _expected)
        end

        def perform_match(actual, expected)
          expected_lines = expected.scan(/[^\n]+/)
          actual_lines = actual.scan(/[^\n]+/)
          differences = Diff::LCS::diff(expected_lines, actual_lines)
          @diff = differences.map do |chunk|
              added_at = (add = chunk.detect{|d| d.action == '+'}) && add.position+1
              removed_at = (remove = chunk.detect{|d| d.action == '-'}) && remove.position+1
              "Line #{added_at}/#{removed_at}:\n"+
              chunk.map do |change|
                "#{change.action} #{change.element}"
              end*"\n"
            end*"\n"
          @diff != ''
        end

        def failure_message_for_should
          "expected a difference, but got none"
        end

        failure_message_for_should_not do |actual|
          "expected no difference, but got:\n#{@diff}"
        end
      end
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
activefacts-0.8.10	spec/helpers/string_matcher.rb