onitake commented on issue #3546: [FIX] Rethrow takeVMSnapshot() exception URL: https://github.com/apache/cloudstack/pull/3546#issuecomment-519829463 The problem here is that this fairly difficult, as I don't have a reliable way to trigger throwing an exception, in a real life scenario. As I'm also new to the CloudStack code base, I don't know if there is a good way to test the behaviour in a unit test. A test scenario should (roughly) look like this: - prepare a test VM - prime takeVMSnapshot so it throws an exception - create a VM snapshot - verify that: no NPE occurs, the error is propagated back to the user and/or log, no snapshot was created, no invalid database entry for the snapshot remains (i.e. no DB entry at all, or a DB entry in error state)
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