I also agree with this analysis, and I will take it a step further. Not only did he want to test Pentangeli's reaction, he wanted Pentangeli, who was already uneasy that Michael came unnanounced, to be so shaken that he would give up on his idea to wipe out the Rosatos and make a deal with them as part of a larger plan to help Michael take his revenge against Roth.

"Io sono stanco, sono imbigliato, and I wan't everyone here to know, there ain't gonna be no trouble from me..Don Corleone..Cicc' a port!"

"I stood in the courtroom like a fool."

"I am Constanza: Lord of the idiots."