1. A computer-implemented method for sizing an infrastructure configuration optimized for a workload mix, said method comprising: a) instructing a virtualized-aware testing service (VATS) test controller to perform a test of an initial infrastructure configuration in a virtualized environment, wherein the test generates at least one test result; b) determining whether the at least one test result satisfies a predetermined requirement as identified in the workload mix; c) modifying at least one of a plurality of parameters of the initial infrastructure configuration to create a modified infrastructure configuration in response to the at least one test result failing to satisfy the predetermined requirement; d) instructing the VATS test controller to perform another test on the modified infrastructure configuration to identify another at least one test result; e) determining whether the another at least one test result satisfies the predetermined requirement as identified in the workload mix; f) determining a final infrastructure configuration that causes the another at least one test result to satisfy the predetermined requirement is identified; and g) outputting the final infrastructure configuration, wherein the final infrastructure configuration is optimally sized for the workload mix.