added make test and cleanup

Makefile

@@ -9,5 +9,8 @@ debug: ## Build extension with debug prints and assertions
 clean: ## Remove the build folder and the shared library
 	rm -rf build/ creader.cpython*
 
+test: ## Run unit tests using pytest
+	python -m pytest 
+
 help: # from compiler explorer
 	@grep -E '^[0-9a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-20s\033[0m %s\n", $$1, $$2}'