assert_truth_table.rb

  # constructor = lambda { build_valid_user }
  # truth_table = [ 
  #   [ :account_admin=,  :can_upload=, :"account.public_uploads_allowed=", :can_upload_files?, :can_upload_public_files?],
  #   [ false,            false,        false,                              false,              false],
  #   [ true,             false,        false,                              true,               true],
  #   [ false,            true,         false,                              true,               false],
  #   [ true,             true,         false,                              true,               true],
  #   [ false,            false,        true,                               false,              false],
  #   [ true,             false,        true,                               true,               true],
  #   [ false,            true,         true,                               true,               true],
  #   [ true,             true,         true,                               true,               true]
  # ]
  #
  # assert_truth_table(constructor, truth_table)
  #
  def assert_truth_table(constructor, matrix)
    field_list = matrix.shift.map(&:to_s)
    matrix.each do |row|
      instance = constructor.call
      field_list.each_with_index do |fields,index|
        next unless fields =~ /=$/
        chain = fields.split('.')
        method, tmp = chain.pop, instance
        chain.each { |m| tmp = tmp.send(m) }
        tmp.send(method, row[index])
      end
      field_list.each_with_index do |fields,index|
        next if fields =~ /=$/
        chain = fields.split('.')
        method, tmp = chain.pop, instance
        chain.each { |m| tmp = tmp.send(m) }
        assert_equal(row[index], tmp.send(method))
      end
    end
  end
  

Creating a “truth table” is not hard, you can use an useful tool (CKod, at http://ckod.sourceforge.net/_/) to make a “truth table”.

1. CKod homepage: http://ckod.sourceforge.net/
2. CKod online: http://ckod.sourceforge.net/_/
3. CKod forum: http://ckod.sourceforge.net/~/

Good luck to you!