Review Request: Added a test that expects a _contending_ MasterDetector instance will send a NoMasterDetected message to the listening PID.

[Benjamin Hindman]

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https://reviews.apache.org/r/7293/
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Review request for mesos, John Sirois, Vinod Kone, and Ben Mahler.


Description
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See summary (5 of 7).


Diffs
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  src/tests/utils.hpp fc2023b 
  src/tests/zookeeper_tests.cpp 2e04069 

Diff: https://reviews.apache.org/r/7293/diff/


Testing
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This added test is EXPECTED to fail.


Thanks,

Benjamin Hindman