Add comprehensive test framework for TraceParserGen#2308

Draft

Copilot wants to merge 7 commits intomainfrom

copilot/add-test-framework-for-traceparsergen-2

Commits on Oct 7, 2025

Initial plan
Copilot
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Create initial TraceParserGen.Tests project with test framework

Copilot
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brianrob
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Add README and platform-aware test skipping

Copilot
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brianrob
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Address PR feedback: improve test framework with trace file validation

Copilot
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brianrob
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Remove else path - always create parser and process trace

Copilot
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brianrob
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Simplify test project: target net462 only, use TEMP dir, remove TraceEvent reference

Copilot
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brianrob
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Remove FindInputDir and use ProjectReference for TraceEvent in test apps

Copilot
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brianrob
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