def METHOD_NAME(self):
    """Test signing invalid credit trade"""
    assertion_id = SigningAuthorityAssertion.objects.first().id
    bad_id = 50000
    self.assertFalse(CreditTrade.objects.filter(id=bad_id).exists())
    payload = {
        'hasAccepted': True,
        'signingAuthorityAssertion': assertion_id,
        'creditTrade': bad_id
    }
    response = self.clients[self.user_map[
        TestSigningAuthorityConfirmations.UserRelationship.INITIATOR
    ]].post(
        '/api/signing_authority_confirmations',
        content_type='application/json',
        data=json.dumps(payload)
    )
    self.assertEqual(
        response.status_code,
        status.HTTP_403_FORBIDDEN
    )