def METHOD_NAME(self):
    user = get(User)
    another_user = get(User)
    org_one = get(Organization, slug="one", owners=[user])
    org_two = get(Organization, slug="two", owners=[user])
    org_three = get(Organization, slug="three", owners=[another_user])
    get(Organization, slug="four", owners=[user, another_user])
    get(Organization, slug="five", owners=[])
    self.assertEqual(
        {org_one, org_two}, set(Organization.objects.single_owner(user))
    )
    self.assertEqual(
        {org_three}, set(Organization.objects.single_owner(another_user))
    )