  Self-testing refers to the possibility of characterizing an unknown quantum
device based only on the observed statistics. Here we develop methods for
self-testing entangled quantum measurements, a key element for quantum
networks. Our approach is based on the natural assumption that separated
physical sources in a network should be considered independent. This provides a
natural formulation of the problem of certifying entangled measurements.
Considering the setup of entanglement swapping, we derive a robust self-test
for the Bell-state measurement, tolerating noise levels up to 5%. We also
discuss generalizations to other entangled measurements.
