The tools exist, but maybe not in a single nice package. I use:

- A pass-thru USB power meter. Measures volts, amps, wattage (simple arithmetic), and watt-hours

- a USB load device. You can configure the voltage and amps to draw. Used in conjunction with the above, you can see just how much a USB supply can supply

- a watch cell powered cable tester. Not essential for your use-case, but great for working out whether a cable is at fault or not.

None of this directly measures quality, but usually you can infer that from amps, and from negotiation.