I'm writing unit tests for the Oregon Coordinate Reference System. The ArcGIS conversion does not match sample data provided by Oregon. Is it me or is it ArcGIS? I compared with an open source library based on proj4 and its conversion gives the expected results.
44 49 57.80936, 117 48 54.56244
I tried Authority IDs of both 6784 and 6786. I used 4326 for the input coordinates.