add test case for additional underscore idiom
add test case for additional underscore idiom

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