### Question:
VersionInfoUtils { static String userAgent() { StringBuilder buffer = new StringBuilder(DEFAULT_STRING_LENGTH); buffer.append("aws-sdk-"); buffer.append(StringUtils.lowerCase(VersionInfoUtils.getPlatform())); buffer.append("/"); buffer.append(VersionInfoUtils.getVersion()); buffer.append(" "); buffer.append(replaceSpaces(System.getProperty("os.name"))); buffer.append("/"); buffer.append(replaceSpaces(System.getProperty("os.version"))); buffer.append(" "); buffer.append(replaceSpaces(System.getProperty("java.vm.name"))); buffer.append("/"); buffer.append(replaceSpaces(System.getProperty("java.vm.version"))); buffer.append("/"); buffer.append(replaceSpaces(System.getProperty("java.version"))); String language = System.getProperty("user.language"); String region = System.getProperty("user.region"); if (language != null && region != null) { buffer.append(" "); buffer.append(replaceSpaces(language)); buffer.append("_"); buffer.append(replaceSpaces(region)); } return buffer.toString(); }  static String getVersion(); static String getPlatform(); static String getUserAgent();  }### Answer:
@Test public void userAgent() { String userAgent = VersionInfoUtils.userAgent(); System.out.println(userAgent); System.out.println(userAgent.length()); assertNotNull(userAgent); }