run-tests: add missing life-cycle methods on the example custom test result...
run-tests: add missing life-cycle methods on the example custom test result
A previous commit introduced `onStart` and `onEnd` methods on test result but
the one used in tests lacked those two methods. Fix it and add some output to
be sure they are called.
Differential Revision:
https://phab.mercurial-scm.org/D3899
