new_contents: from thefuck.rules.man_no_space import match, get_new_command
  from tests.utils import Command
  
  
  def test_match():
      assert match(Command('mandiff', stderr='mandiff: command not found'), None)
      assert not match(Command(), None)
  
  
  def test_get_new_command():
      assert get_new_command(
          Command('mandiff'), None) == 'man diff'
  
subject: add tests for man_no_space