old_contents: from nose.tools import istest, assert_equal
  
  from whack.hashes import Hasher
  
  @istest
  def hashing_the_same_single_value_gives_the_same_hash():
      def create_hash():
          hasher = Hasher()
          hasher.update("one")
          return hasher.hexdigest()
      
      assert_equal(create_hash(), create_hash())
  
new_contents: from nose.tools import istest, assert_equal
  
  from whack.hashes import Hasher
  
  @istest
  def hashing_the_same_single_value_gives_the_same_hash():
      def create_hash():
          hasher = Hasher()
          hasher.update("one")
          return hasher.hexdigest()
      
      assert_equal(create_hash(), create_hash())
  
  @istest
  def hashing_multiple_values_in_the_same_order_gives_the_same_hash():
      def create_hash():
          hasher = Hasher()
          hasher.update("one")
          hasher.update("two")
          return hasher.hexdigest()
      
      assert_equal(create_hash(), create_hash())
  
subject: Add test for hashing multiple values