Fix Serialize_ManagementException by referencing functional BinaryFormatter

[jeffhandley]

The in-box BinaryFormatter has thrown PlatformNotSupportedException since .NET 9, so this OuterLoop, WMI-gated test has been failing whenever it actually runs.

Follow the established pattern used by nine other libraries test projects (for example Microsoft.Extensions.Hosting.Unit.Tests and System.Runtime.Tests): take a private ProjectReference on the NetCoreAppMinimum build of System.Runtime.Serialization.Formatters, which has a functional implementation, and gate the test on PlatformDetection.IsBinaryFormatterSupported so it skips where the feature is unavailable (source-build, NativeAOT, mobile, browser).

ManagementException remains [Serializable] with a GetObjectData override that deliberately omits ErrorInformation, so this keeps real coverage of shipping product behavior on both net11.0 and net481 instead of deleting it.

Fixes #119631

Validation

Ran locally on Windows 11 ARM64 (WmiTestHelper.IsWmiSupported gates on Arm32, not ARM64, so these tests really do execute here):

• Baseline build.cmd clr+libs -rc release — exit 0
• Both TFMs build with 0 warnings, 0 errors
• Target test, net11.0-windows, OuterLoop — Total 1, Failed 0
• Control with the csproj change reverted — Failed 1, with the exact PlatformNotSupportedException from the issue
• Target test, net481, OuterLoop — Total 1, Failed 0
• Full suite, net11.0-windows — 36 total, 0 failed, 10 skipped
• Full suite, net481 — 35 total, 0 failed, 10 skipped

Verified the functional 157,184 B assembly is copied to the test output and that the generated runtimeconfig carries "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization": true.

Why each attribute is required

Each was confirmed empirically by removing it and observing the failure:

Missing	Lands in output	Failure
Private="true"	nothing	FileNotFoundException for Version=11.0.0.0
SetTargetFramework	70,144 B stub	PlatformNotSupportedException
the IsBinaryFormatterSupported gate	n/a	breaks source-build, where NetCoreAppMinimum collapses onto NetCoreAppCurrent and the reference resolves back to the throwing build
nothing (this PR)	157,184 B functional	passes

Private="true" is needed because eng/references.targets defaults Private to false for any ProjectReference whose filename appears in @(NetCoreAppLibrary), which includes System.Runtime.Serialization.Formatters. That default is normally right, but here we deliberately want a different build than the one in the shared framework.

Note

This pull request was authored by GitHub Copilot.

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[Copilot]

Pull request overview

This PR fixes System.Management.Tests’ Serialize_ManagementException outer-loop test on modern .NET by ensuring it only runs when WMI and BinaryFormatter are available, and by referencing a functional System.Runtime.Serialization.Formatters build for the .NET (non-NetFx) target.

Changes:

• Added a combined IsWmiAndBinaryFormatterSupported gate and updated Serialize_ManagementException’s [ConditionalFact] to use it.
• Updated System.Management.Tests.csproj (non-NetFx) to ProjectReference the NetCoreAppMinimum build of System.Runtime.Serialization.Formatters, with Private="true" and SetTargetFramework=....

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/libraries/System.Management/tests/System/Management/ManagementObjectTests.cs	Gates Serialize_ManagementException on both WMI and BinaryFormatter availability via a combined conditional.
src/libraries/System.Management/tests/System.Management.Tests.csproj	References the functional NetCoreAppMinimum System.Runtime.Serialization.Formatters and ensures it’s copied locally for the test run.

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