Test for prepare_hdf5_file.
Test for prepare_hdf5_file.

dmitriy-serdyuk/fuel,udibr/fuel,dribnet/fuel,mila-udem/fuel,udibr/fuel,aalmah/fuel,capybaralet/fuel,capybaralet/fuel,vdumoulin/fuel,markusnagel/fuel,mila-udem/fuel,janchorowski/fuel,janchorowski/fuel,aalmah/fuel,markusnagel/fuel,dribnet/fuel,vdumoulin/fuel,dmitriy-serdyuk/fuel