Unit tests don't actually test, because Windows.

[jas88]

Describe the bug

Failures on Windows don't actually fail.

actions/runner-images#6668

To Reproduce
Steps to reproduce the behavior:
Write a test that fails, like Assert.Fail(). Test will spuriously "pass" since exit code is ignored under pwsh unlike Bash.

Expected behavior
Failing test should actually fail.

Screenshots
If applicable, add screenshots to help explain your problem.

Additional context

Fortunately only an issue on Windows runners, which AIUI means only RDMP and RdmpDicom potentially affected.

[jas88]

Fixed in #419