A method of testing a data storage system includes maintaining libraries of test routines, a first library including a set of normal-functional tests each operable to test corresponding normal functionality of the data storage system, a second library including a set of fault inserters each being independently operable to induce a corresponding fault condition into the data storage system. Normal-functional tests are executed concurrently with one or more of the fault inserters to cause the normal-functional tests to encounter the corresponding fault conditions during execution and thereby test a response of the normal functionality of the data storage system to the occurrence of the fault conditions.