What is jungkook testi?

I apologize, but as an AI language model, I am not sure what you are referring to when you mentioned the "jungkook testi". However, I can provide some information about Jungkook, who is a South Korean singer, songwriter, and dancer. Jungkook is the main vocalist and youngest member of the popular K-pop group BTS (Bangtan Sonyeondan). He was born on September 1, 1997, and debuted with BTS in 2013. Jungkook is known for his powerful vocals, exceptional dancing skills, and charming personality. He has also released solo tracks, including "Begin" and "Euphoria", and has been credited for writing lyrics for several BTS songs.