old_contents: 
  import os
  import pytest
  from cisco_olt_http import operations
  from cisco_olt_http.client import Client
  
  
  @pytest.fixture
  def data_dir():
      return os.path.abspath(
          os.path.join(os.path.dirname(__file__), 'data'))
  
  
  def test_get_data():
      client = Client('http://base-url')
      show_equipment_op = operations.ShowEquipmentOp(client)
      op_data = show_equipment_op.get_data()
      assert op_data
  
  
  class TestOperationResult:
  
      def test_ok_response(self, data_dir):
  
          class Response:
              pass
          response = Response()
  
          with open(os.path.join(data_dir, 'ok_response.xml')) as of:
              response.content = of.read()
  
          operation_result = operations.OperationResult(response)
  
          assert not operation_result.error
          assert operation_result.error_str == 'OK'
  
new_contents: 
  import os
  import pytest
  import requests
  from cisco_olt_http import operations
  from cisco_olt_http.client import Client
  
  
  @pytest.fixture
  def data_dir():
      return os.path.abspath(
          os.path.join(os.path.dirname(__file__), 'data'))
  
  
  def test_get_data():
      client = Client('http://base-url')
      show_equipment_op = operations.ShowEquipmentOp(client)
      op_data = show_equipment_op.get_data()
      assert op_data
  
  
  class TestOperationResult:
  
      def test_ok_response(self, data_dir, mocker):
  
          response = mocker.Mock(autospec=requests.Response)
  
          with open(os.path.join(data_dir, 'ok_response.xml')) as of:
              response.content = of.read()
  
          operation_result = operations.OperationResult(response)
  
          assert not operation_result.error
          assert operation_result.error_str == 'OK'
  
subject: Use mock instead of own class