  We present a census of eclipsing binary systems with classical Cepheid as a
component. All such systems known were found in the OGLE collection of
classical Cepheids in the Magellanic System. We extend the list of potential
candidates adding four new objects found in the OGLE-IV photometric data.
  One of the new Cepheids in the eclipsing system, OGLE-SMC-CEP-3235, revealed
only one eclipse during 15 years of the OGLE photometric monitoring. However,
it additionally shows very well pronounced light-time effect indicating that
the binarity is real. We also search for the light-time effect in other known
eclipsing Cepheids and we clearly detect it in OGLE-LMC-CEP-1812. We discuss
application of this tool for the search for Cepheids in non-eclipsing binary
systems.
