  We describe a set of measurement protocols for performing non-classicality
tests and the verification of entangled superposition states of macroscopic
continuous variable systems, such as nanomechanical resonators. Following
earlier works, we first consider a setup where a two-level system is used to
indirectly probe the motion of the mechanical system via Ramsey measurements
and discuss the application of this methods for detecting non-classical
mechanical states. We then show that the generalization of this techniques to
multiple resonator modes allows the conditioned preparation and the detection
of entangled mechanical superposition states. The proposed measurement
protocols can be implemented in various qubit-resonator systems that are
currently under experimental investigation and find applications in future
tests of quantum mechanics at a macroscopic scale.
