Mock Environment Variable

[Dave Wiard]

We have a function that does nothing more than check the value of [System.Environment]::OSVersion.Version for specific values and returns a $true/$false result. I saw a post on Stack Overflow that demonstrated how to do this but it does not appear to work for all variables. When I tried to set the OSVersion value within a Pester test I received the error below.

    [-] Error occurred in Context block 327ms
      SetValueException: 'OSVersion' is a ReadOnly property.
      RuntimeException: 'OSVersion' is a ReadOnly property.

Is there a way to mock these system environment variables or is this a function that simply cannot be tested using mocked values?

[Dave Wyatt]

You can write a function that just returns the value of an environment variable (which doesn't really much testing), then mock that.

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[Dave Wiard]

Thanks, Dave. This is probably what we'll end up doing. For now I've moved on to other, larger, issues with our current Pester suite.