new_contents: from cyder.api.v1.endpoints.dhcp.tests import DHCPAPITests
  from cyder.cydhcp.vlan.models import Vlan
  
  
  class VlanAPI_Test(DHCPAPITests):
      model = Vlan
      keyvalue_attr = "vlankeyvalue_set"
  
      def create_data(self):
          data = {
              'name': 'vlan',
              'number': 420,
          }
          obj, _ = self.model.objects.get_or_create(**data)
          return obj
  
  
subject: Add vlan tests.