As a copilot, I did a couple of air tests in Tridents, including several full stick pushes at various configurations. These were suprisingly 'gentle' with little or no negative g IIRC, presumably due to the low speeds at push (with the shakers going full blast of course).
We also had to do high speed runs, IIRC at .88, for 5 minutes.
Peter Hunt, IMHO the best tech manager ever, once told me that he had been involved in the flight test programme at Hatfield on the T3 with John Cunningham. This included a 'terminal velocity' dive, on each example prior to delivery, which involved winging over to a vertical dive with full power to see what the TV was.