Contents

require 'diff/lcs'

class ArrayHelper

  # Compare two arrays.
  def self.compare(expected, actual)
    sdiff = Diff::LCS.sdiff(expected, actual)
    changes = {}
    action_words = {
        '!' => 'changed',
        '+' => 'unexpected',
        '-' => 'missing',
        '=' => 'unchanged'
    }
    sdiff.each_with_index do |change, i|
      action_word = action_words.fetch(change.action)
      key = "change_#{i}"
      attrs = %W/
          action=#{action_word}
          old_pos=#{change.old_position}
          old_ele=#{change.old_element}
          new_pos=#{change.old_position}
          new_ele=#{change.old_element}
      /
      value = attrs.join(' ')
      changes.store(key, value)
    end
    {:sdiff => changes}
  end

end

Version data entries

4 entries across 4 versions & 1 rubygems

Version	Path
minitest_log-1.0.1	lib/helpers/array_helper.rb
minitest_log-1.0.0	lib/helpers/array_helper.rb
minitest_log-0.2.0	lib/helpers/array_helper.rb
minitest_log-0.1.0	lib/helpers/array_helper.rb