old_contents: from pytest import fixture
  from smif.decision import Planning
  
  
  @fixture(scope='function')
  def plan():
      planned_interventions = [
          {
              'name': 'small_pumping_station',
              'build_date': 2045,
              'location': 'oxford',
              'capacity': {
                  'value': 500,
                  'units': 'mcm/day'
              }
          },
          {
              'name': 'small_pumping_station',
              'build_date': 2035,
              'location': 'bicester',
              'capacity': {
                  'value': 500,
                  'units': 'mcm/day'
              }
          },
          {
              'name': 'large_pumping_station',
              'build_date': 2035,
              'location': 'abingdon',
              'capacity': {
                  'value': 1500,
                  'units': 'mcm/day'
              }
          }
      ]
  
      return Planning(planned_interventions)
  
  
  class TestPlanning:
  
      def test_intervention_names(self, plan):
          expected = {'small_pumping_station', 'large_pumping_station'}
          actual = plan.names
          assert actual == expected
  
      def test_timeperiods(self, plan):
          expected = {2045, 2035}
          actual = plan.timeperiods
          assert actual == expected
  
new_contents: from pytest import fixture
  from smif.decision import Planning
  
  
  @fixture(scope='function')
  def plan():
      planned_interventions = [
          {
              'name': 'small_pumping_station',
              'build_date': 2045,
              'location': 'oxford',
              'capacity': {
                  'value': 500,
                  'units': 'mcm/day'
              }
          },
          {
              'name': 'small_pumping_station',
              'build_date': 2035,
              'location': 'bicester',
              'capacity': {
                  'value': 500,
                  'units': 'mcm/day'
              }
          },
          {
              'name': 'large_pumping_station',
              'build_date': 2035,
              'location': 'abingdon',
              'capacity': {
                  'value': 1500,
                  'units': 'mcm/day'
              }
          }
      ]
  
      return Planning(planned_interventions)
  
  
  class TestPlanning:
  
      def test_intervention_names(self, plan):
          expected = {'small_pumping_station', 'large_pumping_station'}
          actual = plan.names
          assert actual == expected
  
      def test_timeperiods(self, plan):
          expected = {2045, 2035}
          actual = plan.timeperiods
          assert actual == expected
  
      def test_empty(self):
          plan = Planning()
          assert plan.planned_interventions == []
  
subject: check empty planning set