Start Here:
IEC 61000-4-21: “Testing and measurement techniques–Reverberation chamber test methods”
IEC 61000-4-21 aims to standardize radiated testing (both emissions and immunity/susceptibility) in reverb chambers. This includes testing for shielding effectiveness.
ISO 11451: “Road vehicles — Vehicle test methods for electrical disturbances from narrowband radiated electromagnetic energy”
ISO 11451 is a collection of test methods addressing vehicle level immunity to electric fields.