If it doesn't come with the screen then you will need to buy the full front display assembly with home button extension with back metal plate and front camera assembly with speaker.
The least amount of parts you need to get to test it is the home button extension and the front display with the home button plugged in. Then you can test the touch ID fingerprint functionality.
Honestly I don't think it's worth buying like that. For all I know it could have apple activation lock (Locked to iCloud apple ID) or IMEI number blocked.
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