Albert Barnes Commentary Ruth 1:21

"I went out full, and Jehovah hath brought me home again empty; why call ye me Naomi, seeing Jehovah hath testified against me, and the Almighty hath afflicted me?" — Ruth 1:21 (ASV)

The Lord hath testified against me - The phrase is very commonly applied to a man who gives witness concerning (usually against) another in a court of justice (Exodus 20:16; 2 Samuel 1:16; Isaiah 3:9). Naomi in the bitterness of her spirit complains that the Lord Himself turned against her, and was bringing her sins up for judgment.