  We report two new measurements for tests of lepton flavor universality
between electrons and muons using semileptonic $B$ decays with a data set of
$189~\mathrm{fb}^{-1}$ collected at the Belle II experiment between 2019 and
2021. Firstly, we find a ratio of inclusive branching fractions at
$R(X_{e/\mu}) \equiv \mathcal{B}(\overline{B} \rightarrow
Xe^{-}\overline{\nu}_{e})/\mathcal{B}(\overline{B} \rightarrow
X\mu^{-}\overline{\nu}_{\mu}) = 1.007 \pm 0.009 (\mathrm{stat.}) \pm 0.019
(\mathrm{syst.})$. This inclusive measurement leads to the most precise
universality test based on branching fractions. The measured $R(X_{e/\mu})$ is
consistent with the Standard-Model prediction. Secondly, we measure a
comprehensive set of five angular asymmetries of $\overline{B}^{0} \rightarrow
{D^{*}}^{+}\ell^{-}\overline{\nu}_{\ell}$ decays and obtain agreements with the
Standard Model for the measured asymmetries and their differences at a
$p$-value above $13\%$. From both tests, no evidence of lepton universality
violation is found.
