Like the NFL, the NBA hosts a Draft Combine every season where prospects are weighed, measured, and run through drills.
The NBA Combine basically consists of four parts. Each player is weighed and measured, and each player is run through strength and agility drills. There are a series of 5-on-5 games between prospects. Finally, and perhaps most importantly, there are team interviews.
The NFL’s combine is more famous and generally attended by all the top prospects. The NBA Combine does not get as much publicity and many of the top players either do not attend, or attend only for interviews.