MacBook Pro

You’re better off purchasing directly from an Apple retail store to avoid the numerous potential issues you may face!

Shop one-on-one with a Specialist at an Apple Store.

Click ▶︎ Reserve a shopping session. 

See this non-Apple Support link for some good advice. If the Mac doesn't open to the Hello Page - DON'T BUY IT.

https://www.howtogeek.com/771262/buying-a-used-mac-or-macbook-check-these-things-before-you-buy/

Also, if your friend won't or can't do what is contained in this link, DON'T BUY IT --> What to do before you sell, give away, or trade in your Mac - Apple Support