A mechanism for the distribution of a test vector for a system test to a parallel computing environment is discussed. A test vector which controls the parameterization of a system test being conducted is provided as an input parameter to a function. In one implementation, the test vector is declared as a distributed array data type. The processing of the input test vector parameter causes the test vector to be distributed to the parallel computing units holding portions of the system under test. The test vector is then used in executing the system test. The results of the execution of the system test using the test vector may then be saved in a distributed array or returned to a client for presentment to a user.