Test stack clearing in test driver
Test stack clearing in test driver

evinstk/TantechEngine,evinstk/TantechEngineOriginal,evinstk/TantechEngine,evinstk/TantechEngine,evinstk/TantechEngineOriginal,evinstk/TantechEngineOriginal,evinstk/TantechEngineOriginal,evinstk/TantechEngineOriginal,evinstk/TantechEngineOriginal,evinstk/TantechEngine,evinstk/TantechEngine,evinstk/TantechEngine