The only test we know of was an invalid test against a T-64A turret that had been used in prior tests.
And given the Separatists in Donbas didn't record any appreciable losses to Javelins, more evidence is needed from you as the claims come from you.
Here we see a Javelin hit a BMP-3 which is visibly still reversing throughout, the ERA has clearly activated and the fire is dying out as remaining fuel is burnt up along with whatever kit was stored on that side. Now that BMP-3 is definitely mission-killed as the crew and dismounts are going to be knocked silly and minor repairs needed. So still a success in taking one less weapon out of the fight. Just not a permanent success as it will be back.
Had the ERA not worked, the turret would have popped off within seconds as the location it hit would have caused the jet to hit the ammo stowage.
Finally most footage we have of UkA KORDs in action show them using RPGs and Soviet Era ATGMs to take out Russian Armor. Which makes sense as they can loot ammo from the Russians if they are successful and not wiped out.