The same stresses weren't put on the pad, but pad damage did happen during the test firings. SpaceX repaired and tried to reinforce the pad with a specialized concrete called FONDAG RS which "can be used in severe duty industrial concrete applications that may require refractory performance." If you want to go into depth on the repeated test firings, repeated concrete rain, and repeated pad rebuildings, see e.g. the CSI Starbase video "SpaceX's Major Concrete Problem + Water Deluge Construction Begins at Starbase".
Musk tweeted on 21 Apr
3 months ago, we started building a massive water-cooled, steel plate to go under the launch mount.
Wasn’t ready in time & we wrongly thought, based on static fire data, that Fondag would make it through 1 launch.
Looks like we can be ready to launch again in 1 to 2 months.
Recall also that the 31 engine static fire was "less than half of the booster's capability" but it still caused an audible post-fire rain of debris (from NASASpaceflight's 31 engine static fire coverage) (though possibly more from the OLM itself than the pad).