Github user anshul1886 commented on the pull request: https://github.com/apache/cloudstack/pull/39#issuecomment-63429460 Actually null has different meaning than false. False means that vm is not alive while null means it cannot be determined whether it is alive or not. This is existing functionality for all hypervisor investigators so it doesn't make sense to write unit tests for this. This got changed to this behavior while fixing findbug bugs. Better would be to use enum to represent various better states. But that will require many changes and can be taken for next release.
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