Frankly, army conducts the most rigorous firing of all three services.
I am a witness to this.
Every single weapon in the army inventory and the variety of ammunition used with these systems is fired extensively and recorded for various parameters. Tanks, Artillery, SAMs, AAD, small arms (and now increasingly guided rockets and tactical/strategic missiles) have been and are being tested. Perhaps we see less of the SSMs being fired and that is because most of these systems have been fired and operationalized with ASF and now only require incremental enhancements. Second, it seems Pakistan has not had the need to test these systems frequently.
PN is introducing a new capability to its fleet for the very first time (ballistic AShM) so it will require more testing.