So you mean that the supplier provide the radar and it get tested without involvement of user ,sure
Development and testing teams are heavily compartmentalized. The reason is pretty simple, the development team should not be involved in testing. Some companies do it through third party, some do it internally with strict protocols.
At this point, the test pilots are not part of IAF, they are part of ADA or Hal. And it is flying in an test bed. When the user actually tests the radar in an fighter , then it will become like an artillery programme. I can’t even remember the number of final tests Dhanush has been subjected to.
ADA has probably development and test teams, they will validate it first before user trials. User trials for Uttam haven’t began yet. I would love to see Uttam next year in an fighter, but take scientists comments with an pinch of salt, as they are known to make tall untruthful claims which I have fallen too many times in the past.