According to sources about Black Speech, there was a single line invented for the LotR movies (the one where Sauron tells Frodo that there's no life in void).
However, in The Battle of the Five Armies (at approximately 27 minutes) there are many samples of Black Speech by Sauron.
When he taunts Galadriel that she's "the only light, alone in the darkness" (according to the subtitles), what is heard is actually "ashi, burzum ishi" ("the only [one] in darkness").
Is there a full transcript of Sauron's speech in the Dol Guldur scene, up to the moment when Sauron is banished?