Test

test: Add PSBuildTestFixture shared fixture module (#135) #153

Job	Run time
CI / Run Linters	17s
CI / Run Pwsh Tests (macOS-latest)	47s
CI / Run Pwsh Tests (ubuntu-latest)	49s
CI / Run Tests (Windows PowerShell 5.1)	2m 44s
CI / Run Pwsh Tests (windows-latest)	1m 26s
CI / Publish Unit Tests Results	14s
	6m 17s

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