testsuite::test_rate_connections - This test ensures that rate connectionsSynopsis:
(rate_connection_instantaneous, rate_connection_delayed, diffusion_connection) work properly.
(test_rate_connections) run -> NEST exits if test failsDescription:
The test ensures that legal rate connections can be created and that an exception
is thrown if one tries to create illegal rate connections.
Furthermore it is checked that the delay cannot be set for rate_connection_instantaneous connections and
that delay and weight cannot be set for diffusion_connection connections.