Replace os.system with subprocess.run - #165
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`test_debug_mode` used `os.system()`, whose exit code is a platform-dependent packed wait status, not a plain return code, and shelled out to whatever 'python' resolves to on PATH rather than the interpreter actually running pytest. Replace with `subprocess.run` using an argument list and `sys.executable`, capturing output so a CI failure shows the traceback instead of just a bare assert.
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test_debug_modeusedos.system(), whose exit code is a platform-dependent packed wait status, not a plain return code, and shelled out to whatever 'python' resolves to on PATH rather than the interpreter actually running pytest. Replace withsubprocess.runusing an argument list andsys.executable, capturing output so a CI failure shows the traceback instead of just a bare assert.