1. A computer-implemented method for testing a sub-component of a system comprising a hierarchy of sub-components organized in multiple levels, the method comprising: creating a plurality of test executive sequences in response to user input, wherein each test executive sequence maps to a sub-component of the system and is operable to test the respective sub-component, wherein the plurality of test executive sequences are configured to execute according to a hierarchy corresponding to the hierarchy of sub-components; calling a first test executive sequence to test a first sub-component of a first level in the hierarchy, wherein the first level is not the top level of the hierarchy; executing the first test executive sequence without executing test executive sequences that map to sub-components above the first sub-component in the hierarchy; wherein said executing the first test executive sequence tests the first sub-component.