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Editorial Team
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Asked: 2026-06-14T23:52:49+00:00

I want to unit test a class that reads the power information. I have

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I want to unit test a class that reads the power information.
I have a private readonly variable which i assign a value from System.Windows.SystemInformation.PowerStatus and i can use reflection to change this no problem but…

System.Windows.PowerStatus does not have a public constructor and won’t let me inherit from it to derive a testPowerStatus class i can use with my tests.

I want to be able to override the getter for BatteryLifePercent and BatteryLifeRemaining property so i can test that the correct behavior happens when these are certain values.

Is there anyway i can do this? or is this impossible?

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1 Answer

  1. Editorial Team

    The “right” way to do this is to create an abstraction layer. You should create a IPowerInfoProvider interface, and then create a stub implementing the interface for tests, and another implementation providing real power info.

    Your BL should only know about the IPowerInfoProvider interface.

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