text: import pytest
  from unittest import TestCase
  
  from aircraft.deploys.ubuntu.models.v1beta3 import DhcpRangeData
  
  
  class DhcpRangeDataTest(TestCase):
  
      def test__raises_a_value_error_when_end_is_less_than_start(self):
          with pytest.raises(ValueError):
              DhcpRangeData(
                  start='192.168.100.200',
                  end='192.168.100.150',
              )
  