If this is a one time use case, just rent a cable certification tester. If you (or your client) doesn't care about the cabling meeting the specifications and simply care about running at 10 gbps without errors, it all depends what confidence levels you are willing to accept. Assuming you have a 10G switch in the IDF, you can simply run a ping flood at MTU from each port and look for interface errors at the NIC and switch port. Better would be to get two 10G test sets and run them back to back, either running a smart loop on one end, or setting them up for a bidirectional RFC 2544 or BER test. You might find used 10G test sets on eBay, you can look for brands like EXFO, Viavi, VeEX, Anritsu. Another option would be to use a couple NIDs and run RFC 2544 or Y.1731 tests between them, but 10G NIDs are newer and likely more expensive... 1G would be fairly simple and inexpensive right now. Last option would be a full DIY solution running a 10G NIC that supports DPDK and run a traffic generator like Cisco's TRex or supports XDP and run Ostinato.
All depends what you're actually looking to accomplish. There's no such thing as a 10G terminator... if you mean loopback, for 10GbaseT, there's no passive loopback, you'd need a test set that actively loops traffic. If you're testing fiber, it's rather simple so long as it's not BiDi, you just put in a hard loop so long as the power levels will be within spec.