new_contents: 
  from django.test import TestCase
  
  from geotrek.authent.tests.factories import UserFactory
  from geotrek.tourism.forms import TouristicEventForm
  
  
  class PathFormTest(TestCase):
      def test_begin_end_date(self):
          user = UserFactory()
          form1 = TouristicEventForm(
              user=user,
              data={
                  'geom': '{"type": "Point", "coordinates":[0, 0]}',
                  'name_en': 'test',
                  'begin_date': '2022-01-20',
                  'end_date': '2022-01-10',
              }
          )
          self.assertFalse(form1.is_valid(), str(form1.errors))
  
subject: Add test form error when begin date is after end date