This was observed in a CentOS 7 VM, with libevent and SSL enabled:
W0118 22:38:33.789465 3407 scheduler.cpp:513] Dropping SUBSCRIBE: Scheduler is in state DISCONNECTED
I0118 22:38:33.811820 3408 scheduler.cpp:361] Connected with the master at http:../../src/tests/scheduler_tests.cpp:315: Failure
Mock function called more times than expected - returning directly.
Function call: connected(0x7fff97227550)
Expected: to be called once
Actual: called twice - over-saturated and active
Find attached the entire log from a failed run.