  This paper presents our current measurements in a vapor nanocell aiming at a
test of the distance-dependence of the atom-surface interaction, when simple
asymptotic descriptions may turn to be not valid. A state-of-the-art of
atom-surface interaction measurements is provided as an introduction, along
with the comparison with the theory of the van der Waals (or Casimir-Polder)
interaction; it is followed by a presentation of the most salient features of
nanocell spectroscopy
