class RuboCop::Cop::Style::TrailingBlankLines

def message(wanted_blank_lines, blank_lines)
  case blank_lines
  when -1
    'Final newline missing.'
  when 0
    'Trailing blank line missing.'
  else
    instead_of = if wanted_blank_lines == 0
                   ''
                 else
                   "instead of #{wanted_blank_lines} "
                 end
    format('%d trailing blank lines %sdetected.', blank_lines,
           instead_of)
  end
end