using subprocess.call instead of os.system to suppress output on tests
using subprocess.call instead of os.system to suppress output on tests

nikken1/patentprocessor,yngcan/patentprocessor,yngcan/patentprocessor,funginstitute/patentprocessor,funginstitute/patentprocessor,funginstitute/patentprocessor,nikken1/patentprocessor,nikken1/patentprocessor,yngcan/patentprocessor