  In this paper we consider that dark energy could be described solely by a
complex scalar field with a Bose-Einstein condensate-like potential (denoted as
CSFDE), that is, with a self-interaction and a mass term. In particular, we
analyse a solution which in a fast oscillation regime at late-times behaves as
a Cosmological Constant. Our proposal adequately describes the standard
homogeneous and flat Fridman dynamics, furthermore, in this
quintessence--complex scalar field scenario it is possible to mimic the
dynamics related to dark energy. However, when the precision cosmological tests
are implemented in this landscape, the generic Equation-of-State derived for
this model in a restricted regime of a_i (which corresponds to the scale factor
at which the scalar field turns on), cannot be constrained by late-time current
observations, since the analysis constraints solely the scalar field parameters
within values ruled out by the theoretical model. This result is a clear hint
to consider future CSFDE models with, for instance, two scalar fields in order
to study the early-time dynamics of the Universe.
