DOSvc unit test fails with 0x80010123

[pl4nty]

Describe the bug and how to reproduce

I've cloned the repo and targeted net6.0 on Windows 22631.3527, then modified DoSvcTests.cs to import System.Threading.Tasks and return a Task as required by NUnit.

dotnet test UnitTests\PInvoke\DOSvc fails with the following stack trace, running with admin or SYSTEM permissions. Apologies for the screenshot, it's on a VM without copy/paste:

What code is involved

UnitTests\PInvoke\DOSvc

Expected behavior

Test passes successfully. I can't find a successful CI run though, so this might be a regression.

[pl4nty]

Seems like CoSetProxyBlanket doesn't handle auth properly, so we need to initialize manually before IDOManager.

CoInitializeSecurity(
	PSECURITY_DESCRIPTOR.NULL,
	-1,
	[],
	(IntPtr)null,
	Rpc.RPC_C_AUTHN_LEVEL.RPC_C_AUTHN_LEVEL_DEFAULT,
	Rpc.RPC_C_IMP_LEVEL.RPC_C_IMP_LEVEL_IMPERSONATE,
	dwCapabilities: EOLE_AUTHENTICATION_CAPABILITIES.EOAC_STATIC_CLOAKING
);

This starts a download, but the temp file remains empty until timeout. Get-DeliveryOptimizationStatus shows the download has completed though. I suspect an issue with the lock

[dahall]

Fixed test definition and support class