Energy codes and standards generally cover only the construction of buildings. However, the ultimate goal is that energy is used efficiently in the actual operation the building. For example, should commissioning and testing be covered as a separate step? They could and perhaps should. If the ultimate goal of compliance is to get a building that has been designed and constructed to be an energy efficient building, then "getting it right" by commissioning might be an important step in ensuring the building is truly efficient. The 2012 IECC has system commissioning requirements in Section C408.
A topic brief is available that discusses testing and commissioning in greater detail (Resource 1). A topic brief discussing residential duct testing has also been developed (Resource 2).