add test_get_doc_metadata test
add test_get_doc_metadata test

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