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.

1pcs DisplayPort Female Test Board Big DP Tail Plug Test Stand HDMI 20P Interface Data Cable - AliExpress

Definition of Mini DisplayPort

Displayport Device Cable - 6 ft

eDP: A Better Embedded Display Ecosystem

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

DisplayPort - Wikipedia

What Is DisplayPort Over USB-C and How Does It Work?

What is DisplayPort? The video connector explained

Test Happens - Teledyne LeCroy Blog: DisplayPort 2.0 Physical Layer Testing

DisplayPort vs HDMI: What is the difference? - Barco

DisplayPort IP Support Center

What is DisplayPort Certification and Why is Individual Quality Control Just as Important? - Total Phase