  Fusing Majorana zero modes leads to multiple outcomes, a property being
unique to non-Abelian anyons. Successful demonstration of this nontrivial
fusion rule would be a hallmark for the development of topological quantum
computation.Here we show that this can be done by simply attaching a fermionic
mode to a single Majorana zero mode. Through modulation of the energy level of
this fermionic mode as well as its coupling with the Majorana mode in different
sequences, we show that a zero or integer charge pumping can be realized when
different fusion loops are chosen. Such fusion loops are intimately related
with the nontrivial fusion rule of Majorana modes and are solely determined by
the crossings at zero energy in the parameter space. Finally we demonstrate our
proposal in a nanowire-based topological superconductor coupled to a quantum
dot. We show that the charge pumping is robust for MZMs in the real system
irrespective of the initial condition of FM state, contrary to the case for
trivial Andreev bound states. This provides a feasible way to distinguish
Majorana modes from trivial Andreev bound states.
