tests: add test for getfields()
tests: add test for getfields()

higebu/ignition,higebu/ignition,dgonyeo/ignition,coreos/ignition,dgonyeo/ignition,ajeddeloh/ignition,ajeddeloh/ignition,higebu/ignition,ajeddeloh/ignition,coreos/ignition,AlexNPavel/ignition,AlexNPavel/ignition,coreos/ignition,dgonyeo/ignition,AlexNPavel/ignition