Parallelize NetAnalyzers unit tests - #56028
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Summary
This is the independent
net-analyzersreplacement slice of #56015.MethodLevelparallelization for the NetAnalyzers unit-test assembly.src/Microsoft.CodeAnalysis.NetAnalyzers/AGENTS.mdguidance.Ownership
@dotnet/dotnet-analyzers owns this NetAnalyzers test area, with agent and contributor guidance maintained in
src/Microsoft.CodeAnalysis.NetAnalyzers/AGENTS.md.Isolation rationale
Each test creates a self-contained Roslyn compilation through a fresh verifier instance. The assembly has no assembly-, class-, or test-initialization fixtures, and its shared state is limited to init-once immutable metadata references and dynamic-data providers.
ReferenceAssemblies.ResolveAsyncprotects the shared package cache with its cross-process semaphore.The added AGENTS guidance requires future fixtures, data sources, process-global state, and filesystem paths to remain safe for concurrent test methods.
Validation status
This branch contains only the exact two-file
net-analyzersslice from source snapshot84e283b69ce8f087114b5adba1016c8ce1f0e5d0, based on198ec8f3f13efc148f464688a6523341f856e03c. Tests were not run for this split-only draft. Separate NetAnalyzers performance measurement remains pending.