Convair’s delta-winged interceptors, the F-102 Delta Dagger and F-106 Delta Dart are icons of the Cold War. Both aircraft had generally the same configuration but the Delta Dart was a more refined design.
The video below shows some of the flight testing that took place with the F-102 up to the year 1957. Footage includes climate testing in Alaska, radome testing through simulated rain, TF-102 flight tests, F-102 structural modifications, the F-102 sidestick testing program, external fuel tank testing, TF and F-102 weapons testing for the MB-1 Genie and AIM-4 Falcon air to air missiles.
Right about this time period, the F-106 made it’s first flight and gradually envelope expansion testing.
It’s important to note that although the technology has changed, the method by which modern combat aircraft are tested hasn’t. Yes, computer processing power has grown in leaps and bounds but there’s no substitute for actual flight test.