Oregon Revised Statutes Elections § 254.235

(1) Not later than seven days before an election in which voting machines or vote tally systems are used, the county clerk shall:

(2) Prior to the public certification test under subsection (1)(b) of this section, the county clerk shall mail to each affiliate of a major or minor political party within the county that has notified the clerk that notice is desired, a notice of the time and place where the vote tally system will be publicly tested. One representative of each party is entitled to be present to ensure that the testing is done properly. In nonpartisan elections each candidate may designate one representative who has the same powers as the political party representatives. The party and candidate representatives shall certify that they have witnessed the testing. The certificates shall be filed with the county clerk.