Github user aledsage commented on the issue:
https://github.com/apache/brooklyn-server/pull/791
@geomacy not convinced it's worth the effort of trying to mock the
`FileDescriptor` to simulate a `SyncFailedException`. If we were doing more
than retry + propagate, then maybe it would. But the current logic is pretty
simple.
One can mock final classes with Mockito v2 (we're on v2.7.12 currently):
https://stackoverflow.com/a/40018295/1393883, but you need to add a config file
to change the `MockMaker`.
I think this is good as-is.
Have you tried running the integration tests, as well as the unit tests?
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