The current model displays active lines, but there's a Kickstarter for one that shows more information: https://www.kickstarter.com/projects/electr/ble-caberqu-a-di...
https://www.amazon.com/Treedix-Tester-Checker-Acrylic-Chargi...
There are also cases where there can be active electronics in the cable where pins can seem disconnected by a continuity tester but they are actually connected to a chip inside the cable.
Also as an aside, it should be possible to just plug a cable in, and have your OS tell you what kind of cable it is and it's specs. The USB controller has access to this info but there is no standard way to pass it up to the OS like you have with other USB info. Apparently Chromebooks do have controllers which expose this so they can tell you when both the laptop and charger support faster charging but the cable is limited.