old_contents: from django.conf import settings
  from django.test import TestCase
  
  from unittest import skipIf
  
  from geotrek.core.factories import TrailFactory
  from geotrek.authent.factories import UserFactory
  from geotrek.core.forms import TrailForm
  
  
  @skipIf(not settings.TREKKING_TOPOLOGY_ENABLED, 'Test with dynamic segmentation only')
  class TopologyFormTest(TestCase):
      def test_save_form_when_topology_has_not_changed(self):
          user = UserFactory()
          topo = TrailFactory()
          form = TrailForm(instance=topo, user=user)
          self.assertEqual(topo, form.instance)
          form.cleaned_data = {'topology': topo}
          form.save()
          self.assertEqual(topo, form.instance)
  
new_contents: from django.conf import settings
  from django.test import TestCase
  
  from unittest import skipIf
  
  from geotrek.core.factories import TrailFactory, PathFactory
  from geotrek.authent.factories import UserFactory
  from geotrek.core.forms import TrailForm, PathForm
  
  
  @skipIf(not settings.TREKKING_TOPOLOGY_ENABLED, 'Test with dynamic segmentation only')
  class TopologyFormTest(TestCase):
      def test_save_form_when_topology_has_not_changed(self):
          user = UserFactory()
          topo = TrailFactory()
          form = TrailForm(instance=topo, user=user)
          self.assertEqual(topo, form.instance)
          form.cleaned_data = {'topology': topo}
          form.save()
          self.assertEqual(topo, form.instance)
  
  
  class PathFormTest(TestCase):
      def test_overlapping_path(self):
          user = UserFactory()
          PathFactory.create(geom='SRID=4326;LINESTRING(3 45, 3 46)')
          # Just intersecting
          form1 = PathForm(
              user=user,
              data={'geom': '{"geom": "LINESTRING(2.5 45.5, 3.5 45.5)", "snap": [null, null]}'}
          )
          self.assertTrue(form1.is_valid(), str(form1.errors))
          # Overlapping
          form2 = PathForm(
              user=user,
              data={'geom': '{"geom": "LINESTRING(3 45.5, 3 46.5)", "snap": [null, null]}'}
          )
          self.assertFalse(form2.is_valid(), str(form2.errors))
  
subject: Add tests for path overlapping check