Thank you for the thank you Mike.
Because I've been under your Supra more than most, I hope that I am allowed to make a positive and sensible input to your thread.
Whilst stationary with hand brake on and engine running, stand on the brake pedal as hard as you can, with both feet if you like and put your back into it.
That will test them to the maximum pressure that the master cylinder could ever go to and which would be at least twice the pressure that you will ever give them whilst braking in the real World and if/when the calipers don't explode, they will have passed the test.
In my opinion, the weakest link(s) currently in your braking system are the hard-line brake pipes at the 4 corners, as I advised you at the time these were what an MOT station would classify as an advisory and I cleaned them up with a little wire brush and blathered them in Copperslip, they certainly won't be any worse than they were, yet certainly not any better either.
I know they're not pretty and shiny and/or on display and are not made of homo carbon sexual fibres and don't even have a single LED, yet I suggest that you fit some new ones before giving it my test.