In high volume production of cable assemblies, it is common to have computerized testing devices that allow you to plug in each connector to each cable assembly and then check both continuity with little or no voltage and then to load check with working voltages. The tester stores the information for each cable assembly. In aircraft applications, it is common for each assembly to be serialized, so the test data is stored for each serial number.
Again, in high volume production, crimping is often validated with a test piece (coupon)at the beginning of each run using a sample and a destructive pull test. On large runs, coupons are taken and tested at regular intervals.
It is not uncommon to "calibrate" the crimping equipment. That is to use dowel pins to check the choke points of the crimping tool.
In low volume production where it is not cost effective to build a dedicated testing device, continuity is checked by performing a manual pin-out test with an OHM meter. This is very time consuming, as every pin must be checked against every other pin in the assembly.
Some uses will also dictate using a Hi-Pot tester to test the assembly under load.
Figure out how the assembly is to be used and what specifications the customer has for testing before you determine your test plan.