old_contents: """
  Tests for the MerchantFulfillment API class.
  """
  import unittest
  import mws
  from .utils import CommonRequestTestTools
  
  
  class MerchantFulfillmentTestCase(unittest.TestCase, CommonRequestTestTools):
      """
      Test cases for MerchantFulfillment.
      """
      # TODO: Add remaining methods for MerchantFulfillment
      def setUp(self):
          self.api = mws.MerchantFulfillment(
              self.CREDENTIAL_ACCESS,
              self.CREDENTIAL_SECRET,
              self.CREDENTIAL_ACCOUNT,
              auth_token=self.CREDENTIAL_TOKEN
          )
          self.api._test_request_params = True
  
      # def test_get_eligible_shipping_services(self):
      #     """
      #     XYZ operation.
      #     """
      #     params = self.api.get_eligible_shipping_services()
      #     self.assert_common_params(params)
      #     assert params['Action'] == 'GetEligibleShippingServices'
  
      # def test_create_shipment(self):
      #     """
      #     XYZ operation.
      #     """
      #     params = self.api.create_shipment()
      #     self.assert_common_params(params)
      #     assert params['Action'] == 'CreateShipment'
  
      def test_get_shipment(self):
          """
          XYZ operation.
          """
          shipment_id = 'UCXN7ZubAj'
          params = self.api.get_shipment(
              shipment_id=shipment_id,
          )
          self.assert_common_params(params)
          assert params['Action'] == 'GetShipment'
          assert params['ShipmentId'] == shipment_id
  
      def test_cancel_shipment(self):
          """
          XYZ operation.
          """
          shipment_id = 'C6Pvk0b2yZ'
          params = self.api.cancel_shipment(
              shipment_id=shipment_id,
          )
          self.assert_common_params(params)
          assert params['Action'] == 'CancelShipment'
          assert params['ShipmentId'] == shipment_id
  
new_contents: """
  Tests for the MerchantFulfillment API class.
  """
  import unittest
  import mws
  from .utils import CommonRequestTestTools
  
  
  class MerchantFulfillmentTestCase(unittest.TestCase, CommonRequestTestTools):
      """
      Test cases for MerchantFulfillment.
      """
      # TODO: Add remaining methods for MerchantFulfillment
      def setUp(self):
          self.api = mws.MerchantFulfillment(
              self.CREDENTIAL_ACCESS,
              self.CREDENTIAL_SECRET,
              self.CREDENTIAL_ACCOUNT,
              auth_token=self.CREDENTIAL_TOKEN
          )
          self.api._test_request_params = True
  
      # def test_get_eligible_shipping_services(self):
      #     """
      #     XYZ operation.
      #     """
      #     params = self.api.get_eligible_shipping_services()
      #     self.assert_common_params(params)
      #     self.assertEqual(params['Action'], 'GetEligibleShippingServices')
  
      # def test_create_shipment(self):
      #     """
      #     XYZ operation.
      #     """
      #     params = self.api.create_shipment()
      #     self.assert_common_params(params)
      #     self.assertEqual(params['Action'], 'CreateShipment')
  
      def test_get_shipment(self):
          """
          XYZ operation.
          """
          shipment_id = 'UCXN7ZubAj'
          params = self.api.get_shipment(
              shipment_id=shipment_id,
          )
          self.assert_common_params(params)
          self.assertEqual(params['Action'], 'GetShipment')
          self.assertEqual(params['ShipmentId'], shipment_id)
  
      def test_cancel_shipment(self):
          """
          XYZ operation.
          """
          shipment_id = 'C6Pvk0b2yZ'
          params = self.api.cancel_shipment(
              shipment_id=shipment_id,
          )
          self.assert_common_params(params)
          self.assertEqual(params['Action'], 'CancelShipment')
          self.assertEqual(params['ShipmentId'], shipment_id)
  
subject: Replace assert with self.assertEqual