Developed native debugging support for vstest.console in the microsoft/vstest repository, introducing the VSTEST_RUNNER_NATIVE_DEBUG environment variable to enhance test execution diagnostics. The implementation allows the test runner, written in C#, to pause and wait for a native debugger to attach when the variable is set, streamlining the process of diagnosing test failures in both CI and local environments. This feature was validated end-to-end to ensure seamless integration with existing workflows and minimal disruption to test execution. The work leveraged core libraries, debugging expertise, and test automation skills to improve reliability and reduce mean time to resolution for developers.