What is the test for proving a will in a different country?

'If he has property in another state or country, it may be necessary to prove the will or to take out administration there, either for the purpose of obtaining and collecting the property, or for the security of local creditors or the protection of rights of the state to receive taxes, or of residents of the state who ought to get what they are entitled to receive from the estate, without being obliged to follow the property into another jurisdiction. But such probate of a will or such administration of an intestate estate is always merely ancillary. It is not for the purpose of establishing rights of succession, whether under a will or otherwise. Those are to be established in the courts of the state or country where the deceased person had his domicile. The strictly ancillary character of such proceedings has been recognized by many decisions of the courts of our own state, as well as of courts elsewhere.'

In Davis v. Upson, 230 Ill. 327, 82 N.E. 824, it was said: