What do you need to test in DisplayPort interface?

Before video and audio content is sent over a DP link and displayed on the monitor screen a lot of communication has been occurring between a DP source and sink and a possible branch device.

DisplayPort Compliance Testing

DisplayPort to DVI Adapter - DP to DVI-D - DisplayPort & Mini DisplayPort Adapters, Display & Video Adapters

DisplayPort: A Better Video Interface

DisplayPort IP Support Center

DisplayPort vs HDMI: What's Best for High Refresh Rate Gaming?

HDMI vs DisplayPort vs DVI vs VGA vs USB-C: Every connection explained plus how to get 144Hz

A Guide to DisplayPort 2.1 (and previously 2.0) - Certifications, Standards, Cables and Areas of Confusion and Concern - TFTCentral

The DisplayPort™ Interface - What is DisplayPort™? - reichelt Magazin

N5991DP2A DisplayPort 2.0 Receiver Test

What's a DisplayPort Cable? – iVANKY

What Is DisplayPort 2.0?

How to test HDMI Cable and Display Port Cable