How do I work out if a USB C cable is safe to use?

There's a lot of press about how some USB C cables are dangerous - as I understand it, they have the wrong resistor, and that causes the device to draw too much power.

On the other hand, I'd like to get cheap USB A to C cables for stashing around the house. I also currently have a probably non standard cable that came with the phone - designed to handle up to 5v 4A - I have a one plus three and its part of the dash charge quick charge system. I'm assuming that's safe for use with a PC though.

While "get cables that have been tested by benson leung" is a good idea, having a standard way to test my own cables that does not involve having a nexus 5x or 6p would be nice.

From what I understand, the issue is with excessive current draw - would monitoring the current draw phone side, with an app like ampere be sufficient, and what current is 'safe' for a phone connected to a PC?

If I were to wish to check the resistance, where would it be?

In short, how, short of picking up another phone, can I test to see if its safe?

I'll be using a variety of possible charging sources - but more importantly, I want a cable spare I can use to connect my phone for data transfer. For my purposes, lets assume a windows 10 PC with a powered USB hub as a baseline for testing.

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