Oregon Revised Statutes Probate Law § 112.305

(1) The will evidences an intent that it not be revoked by the subsequent marriage or was drafted under circumstances establishing that it was in contemplation of the marriage;

(2) The testator and spouse entered into a written contract before the marriage that either makes provision for the spouse or provides that the spouse is to have no rights in the estate of the testator; or

(3) The testator executed the will after entering into a registered domestic partnership under ORS 106.300 to 106.340 or a similar law in another state and the testator subsequently marries the domestic partner.