def METHOD_NAME(self):
    """
    If a custom benefit exists and the kwargs instance is passed to init, the initial value for the custom_benefit
    should be the instance.
    """
    benefit = create_benefit(CustomBenefitModel)
    form = forms.BenefitForm(instance=benefit)
    self.assertFalse(form.fields["type"].required)
    self.assertEqual(form.fields["custom_benefit"].initial, benefit.id)