Danielle Turchiano Senior Features Editor, TVSPOILER ALERT: Do not read if you have not yet watched “Testimony,” the eighth episode of “The Handmaid’s Tale” Season 4, streaming now on Hulu.When Elisabeth Moss chose the third episode of “The Handmaid’s Tale” Season 4 to mark her directorial debut, she did so because she wanted the challenge of taking characters she knew so well to new places — literally and physically.