def METHOD_NAME():
    if not os.path.exists(TESTDATA_FILE):
        with gzip.open(TESTDATA_ZIPPED, 'rt', encoding='utf-8') as zipfile:
            blocks = json.load(zipfile)
            with open(TESTDATA_FILE, 'w', encoding='utf-8') as f:
                json.dump(blocks, f, ensure_ascii=False, indent=4)