def METHOD_NAME(self):
    form = CourseForm(user=self.user, instance=self.course, data={
        'name_en': 'Course',
        'geom': '{"type": "GeometryCollection", "geometries": [{"type": "Point", "coordinates": [3, 45]}]}',
        'points_reference': "{\"type\":\"MultiPoint\",\"coordinates\":[[5.82618713378906,43.767622885160975]]}",
        'parent_sites': [str(self.course.parent_sites.first().pk)],
    })
    self.assertTrue(form.is_valid())
    created = form.save()
    self.assertIsNone(created.points_reference)