old_contents: """
  Tests for the MWS.Sellers API class.
  """
  import unittest
  import mws
  from .utils import CommonRequestTestTools
  
  
  class SellersTestCase(unittest.TestCase, CommonRequestTestTools):
      """
      Test cases for Sellers.
      """
      # TODO: Add remaining methods for Sellers
      def setUp(self):
          self.api = mws.Sellers(
              self.CREDENTIAL_ACCESS,
              self.CREDENTIAL_SECRET,
              self.CREDENTIAL_ACCOUNT,
              auth_token=self.CREDENTIAL_TOKEN
          )
          self.api._test_request_params = True
  
new_contents: """
  Tests for the Sellers API class.
  """
  import unittest
  import mws
  from .utils import CommonRequestTestTools
  
  
  class SellersTestCase(unittest.TestCase, CommonRequestTestTools):
      """
      Test cases for Sellers.
      """
      # TODO: Add remaining methods for Sellers
      def setUp(self):
          self.api = mws.Sellers(
              self.CREDENTIAL_ACCESS,
              self.CREDENTIAL_SECRET,
              self.CREDENTIAL_ACCOUNT,
              auth_token=self.CREDENTIAL_TOKEN
          )
          self.api._test_request_params = True
  
      def test_list_marketplace_participations(self):
          """
          ListMarketplaceParticipations operation
          """
          params = self.api.list_marketplace_participations()
          self.assert_common_params(params)
          assert params['Action'] == 'ListMarketplaceParticipations'
  
      def test_list_marketplace_participations_by_next_token(self):
          """
          ListMarketplaceParticipationsByNextToken operation, by way of method decorator.
          """
          next_token = 'token_foobar'
          params = self.api.list_marketplace_participations(next_token=next_token)
          self.assert_common_params(params)
          assert params['Action'] == 'ListMarketplaceParticipationsByNextToken'
          assert params['NextToken'] == next_token
  
      def test_list_marketplace_participations_by_next_token_alias(self):
          """
          ListMarketplaceParticipationsByNextToken operation, by way of alias method.
          """
          next_token = 'token_foobar'
          params = self.api.list_marketplace_participations_by_next_token(next_token)
          self.assert_common_params(params)
          assert params['Action'] == 'ListMarketplaceParticipationsByNextToken'
          assert params['NextToken'] == next_token
  
subject: Expand tests for Sellers API