old_contents: """Tests for methods defined in mongo_utils.py"""
  import os
  from unittest import TestCase
  from uuid import uuid4
  
  from pymongo import ReadPreference
  
  from django.conf import settings
  
  from xmodule.mongo_utils import connect_to_mongodb
  
  
  class MongoUtilsTests(TestCase):
      """
      Tests for methods exposed in mongo_utils
      """
      def test_connect_to_mongo_read_preference(self):
          """
          Test that read_preference parameter gets converted to a valid pymongo read preference.
          """
          host = 'edx.devstack.mongo' if 'BOK_CHOY_HOSTNAME' in os.environ else 'localhost'
          db = 'test_read_preference_%s' % uuid4().hex
          # Support for read_preference given in constant name form (ie. PRIMARY, SECONDARY_PREFERRED)
          connection = connect_to_mongodb(db, host, read_preference='SECONDARY_PREFERRED')
          self.assertEqual(connection.client.read_preference, ReadPreference.SECONDARY_PREFERRED)
          # Support for read_preference given as mongos name.
          connection = connect_to_mongodb(db, host, read_preference='secondaryPreferred')
          self.assertEqual(connection.client.read_preference, ReadPreference.SECONDARY_PREFERRED)
  
new_contents: """
  Tests for methods defined in mongo_utils.py
  """
  import ddt
  import os
  from unittest import TestCase
  from uuid import uuid4
  
  from pymongo import ReadPreference
  
  from django.conf import settings
  
  from xmodule.mongo_utils import connect_to_mongodb
  
  
  @ddt.ddt
  class MongoUtilsTests(TestCase):
      """
      Tests for methods exposed in mongo_utils
      """
      @ddt.data(
          ('PRIMARY', 'primary', ReadPreference.PRIMARY),
          ('SECONDARY_PREFERRED', 'secondaryPreferred', ReadPreference.SECONDARY_PREFERRED),
          ('NEAREST', 'nearest', ReadPreference.NEAREST),
      )
      @ddt.unpack
      def test_connect_to_mongo_read_preference(self, enum_name, mongos_name, expected_read_preference):
          """
          Test that read_preference parameter gets converted to a valid pymongo read preference.
          """
          host = 'edx.devstack.mongo' if 'BOK_CHOY_HOSTNAME' in os.environ else 'localhost'
          db = 'test_read_preference_%s' % uuid4().hex
          # Support for read_preference given in constant name form (ie. PRIMARY, SECONDARY_PREFERRED)
          connection = connect_to_mongodb(db, host, read_preference=enum_name)
          self.assertEqual(connection.client.read_preference, expected_read_preference)
          # Support for read_preference given as mongos name.
          connection = connect_to_mongodb(db, host, read_preference=mongos_name)
          self.assertEqual(connection.client.read_preference, expected_read_preference)
  
subject: Convert test to DDT and test for primary, nearest modes.