read_fixture_files

# File activerecord/lib/active_record/fixtures.rb, line 696
    def read_fixture_files
      if File.file?(yaml_file_path)
        read_yaml_fixture_files
      elsif File.file?(csv_file_path)
        read_csv_fixture_files
      else
        raise FixturesFileNotFound, "Could not find #{yaml_file_path} or #{csv_file_path}"
      end
    end