Is there a facility that test cables?

they seemed they were a lot more hefty than I expected. 

where I could get them tested? 

Tested for what exactly? Unless there is no wire in them, I'm pretty sure they will carry 20 amps. 

Have you tried them to test them with your ears?  

Yes, they sound better than the stock cords. I want to get them tested to see that they do in fact shield EMI/RFI and whether they were worth the couple of thousand dollars I paid for them. I also don't know what the difference is between a high current and a source cord is.

You got power cords that function and sound better than what they replaced.  They have no resale value.  That's what you have.

Maybe Amir at AudioScience Review. Not sure he’ll test homemade cables though

Shielded is generally more constrained. Is that what you want? If you were looking for "worth it" you should have borrowed/auditioned a bunch from The Cable Co.
Try a Raven Soniquil free for 45 days.  That should help you peg worth.

Unfortunately it would probably require comparisons of say three major high end brands at different levels to properly position them. The largest selling brands are Audio Quest, Transparent, and Wire World. So, if you got a pair of each at the same cost level as yours, then you could do the comparison. Although, the problem is, that it is component dependent. But this would be a start. 
 

No, a lab thing would be of no use.

Contact audioholics. I believe the owner offers consulting and testing, but it’s not free, as I’m sure you would expect. At lest discuss it with them and see if it’s possible to test for what you are looking for. 

You would likely be disappointed if you found out the actual material cost of those "magic cables." What are "tests" going to prove?

Do yourself a favor and just use them. Convince yourself they're an improvement to your system more than the previous.

Power cable as a means of "improving" your system...that's an ugly thread topic.

Fuses and shiny, anodized,quantum kniffle generators anyone?

Thanks for the responses everyone! @chayro I might do that, t@tablejockey you are probably right; maybe I don't want to know!

dadork-

I suffer from  audio neurosis, but I at least am aware of it.

I use all Nordo$t -wall to speaker. Ridiculous at MSRP. Looks impressive to my non audio, musician friends.

Giving the builder the benefit of the doubt, you have super magnum platinum cables that indeed, make your setup "better."

What Audioholics would do is measure your wire against 10 gauge Belden wire and test for resistance, capacitance and inductance. Supposedly, the lower the better. FYI, he recently tested a 5K pair of Audioquest cables and found them to have inferior specs to Belden. I don’t recall him mentioning the sound. Sounds like it could be interesting to send your cables over to him. Just remember that specs and sound are not always correlated. Tube amps have much worse specs than solid state but a lot of people prefer them. Also keep in mind is that IMO what the science guys are really saying is that 2 pieces of wire that measure the same will sound the same. If the measurements significantly differ, the frequency response will be affected  

If he pointed you to that specific Audioquest cable the presumption would be that it is high current. Come the end of the day, you made a purchase of a cable that you aren't likely going to be able to sell so if it sounds better than the stock cable just sit back and enjoy the music; and take it as a lesson learned.

That's a fact @facten !