Any advice?The article you mention already sums it up:
"There are other companies, like us, who build individually-certified patch cords for data networks, but we don’t know of anyone else who does that for the consumer market......With every Cat 5e, Cat 6, or Cat 6a cable we sell, you will receive the test report for your cable, run on the same test apparatus on which these cables were tested, and confirming that your cable meets the specification. If we build a cable that doesn’t pass, it doesn’t ship."
Seems to me if you buy any cable it should be from BJC. I purchased RCA and speaker wire from them, so I do have personal experience with them.
So, my advice is, don't ponder your question "...is there a way to test the quality of the cable I have and know whether or not it is up to the task?" when BJC indicates they are providing the test report?