Fix debug trace test

[Steve Lee (SteveL-MSFT)]

PR Summary

The PSAdapter Write-Debug test fails inconsistently on macOS. macOS is known to not flush stdio buffers when a process exits so there's a race condition where the pwsh process has exited before the debug trace was written to stderr. The timing of this seems to be due to the Write-Error in the test class that follows Write-Debug. Due to PSAdapter setting $ErrorActionPreference = 'stop' the Write-Error results in an exception that is caught and exits the adapter before the debug message is written out.

Two changes:

• In the PSAdapter, write the trace queue before writing the exception. This shouldn't affect this problem, but this order is correct
• In the test class, explicitly set $ErrorActionPreference = 'continue' since the test is only trying to write an error trace and not throw an exception

Reran the macOS adapter test 5 times with no failures

[Copilot]

🟢 Approval recommended

The focused changes consistently address the test’s unintended termination, with no unresolved findings; tests were not executed.

No open issues 🎉

What changed in this PR

Stabilizes the PowerShell adapter’s debug-trace test on macOS by avoiding an unintended terminating error.

Changes:

• Makes the test resource’s error non-terminating.
• Updates stream tests to expect successful exit codes.
• Drains queued traces before logging adapter exceptions.

File	Description
adapters/​powershell/​Tests/​TestClassResource/​0.0.1/​TestClassResource.psm1	Sets error handling to continue.
adapters/​powershell/​Tests/​powershellgroup.resource.tests.ps1	Updates expected exit codes.
adapters/​powershell/​psDscAdapter/​powershell.resource.ps1	Writes queued traces before exceptions.

_{Review effort: Balanced}