new_contents: from django.test import TestCase
  
  from .. import factories
  from ... import admin, models
  
  
  class TestPackageComponentForm(TestCase):
  
      def test_package_component_form_is_valid_when_component_price_is_0(self):
          data = {
              'monthly_price': '0',
              'amount': '2',
              'type': models.PackageComponent.Types.RAM,
              'price': '9', # price is required but not used in form validation.
          }
          form = admin.PackageComponentForm(data=data)
          self.assertTrue(form.is_valid())
  
      def test_package_component_form_is_invalid_if_package_template_has_connected_packages_already(self):
          template = factories.PackageTemplateFactory()
          factories.OpenStackPackageFactory(template=template)
          instance = template.components.first()
  
          data = {
              'monthly_price': '0',
              'amount': '2',
              'type': instance.type,
              'price': '9', # price is required but not used in form validation.
          }
          form = admin.PackageComponentForm(data=data, instance=instance)
          self.assertFalse(form.is_valid())
  
  
subject: Add unit tests for package component form [WAL-450]