Refactor: Split TestMethodInfo.cs (1113 lines) into focused partial classes

[Copilot]

TestMethodInfo.cs had grown to 1113 lines, mixing concerns across constructor/properties, argument resolution, configuration reading, test execution, lifecycle management, and context setup — making it hard to navigate and review.

Split into 6 partial class files

File	Lines	Contents
TestMethodInfo.cs	111	Constructor, fields, properties, GetAllAttributes, GetAttributes<T>
TestMethodInfo.Arguments.cs	86	SetArguments, ResolveArguments
TestMethodInfo.Configuration.cs	90	GetTestTimeout, GetTestMethodAttribute, GetRetryAttribute, ThrowMultipleAttributesException
TestMethodInfo.Execution.cs	452	InvokeAsync, ExecuteInternalAsync, ExecuteInternalWithTimeoutAsync, GetRealException, HandleMethodException
TestMethodInfo.Lifecycle.cs	374	RunTestInitializeMethodAsync, RunTestCleanupMethodAsync, all Invoke* lifecycle methods, CaptureExecutionContextAfterFixtureIfNeeded
TestMethodInfo.Context.cs	67	SetTestContext, CreateTestClassInstance

Notes

• Pure structural refactoring — no behavioral changes, no API changes
• Each file carries only the using directives it actually needs
• #pragma warning disable CA1852 propagated to all partial class files
• TestMethodInfo.Execution.cs is 452 lines (above the 300-line guideline) because the execution pipeline methods are inherently larger than the issue estimated; further splitting would break logical cohesion

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• c50vsblobprodcus330.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet restore test/UnitTests/MSTestAdapter.PlatformServices.UnitTests/ conntrack --ctstate INVALID,NEW -j DROP (dns block)
• jd4vsblobprodcus366.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet restore test/UnitTests/MSTestAdapter.PlatformServices.UnitTests/ conntrack --ctstate INVALID,NEW -j DROP (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)