Add xUnit tests #4547

Job	Run time
Prepare version string	5s
Build / Build Linux	3m 15s
Build / Build macOS (Apple Silicon)	2m 34s
Build / Build macOS (Intel)	6m 51s
Build / Build Windows ARM64	4m 0s
Build / Build Linux (arm64)	3m 32s
Build / Build Windows x64	4m 0s
Test (windows-latest)	1m 52s
Test (ubuntu-latest)	48s
Test (macos-latest)	49s
Package / Package macOS (osx-x64)	18s
Package / Package Linux (linux-arm64)	48s
Package / Package Windows (win-x64)	25s
Package / Package macOS (osx-arm64)	21s
Package / Package Windows (win-arm64)	24s
Package / Package Linux (linux-x64)	1m 0s
	31m 2s

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