  The extraction of neutrino mixing parameters from accelerator-based neutrino
oscillation experiments relies on proper modeling of neutrino-nucleus
scattering processes using neutrino-interaction event generators. Experimental
tests of these generators are difficult due to the broad range of neutrino
energies produced in accelerator-based beams and the low statistics of current
experiments. Here we overcome these difficulties by exploiting the similarity
of neutrino and electron interactions with nuclei to test neutrino event
generators using high-precision inclusive electron scattering data. To this
end, we revised the electron-scattering mode of the GENIE event generator
($e$-GENIE) to include electron-nucleus bremsstrahlung radiation effects and to
use, when relevant, the exact same physics models and model parameters, as the
standard neutrino-scattering version. We also implemented new models for
quasielastic (QE) scattering and meson exchange currents (MEC) based on the
theory-inspired SuSAv2 approach. Comparing the new $e$-GENIE predictions with
inclusive electron scattering data, we find an overall adequate description of
the data in the QE- and MEC-dominated lower energy transfer regime, especially
when using the SuSAv2 models. Higher energy transfer-interactions, which are
dominated by resonance production, are still not well modeled by $e$-GENIE.
