### Question:
StringUtils extends org.apache.commons.lang3.StringUtils { public static String getWeekDay() { String[] weekDays = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"}; Calendar cal = Calendar.getInstance(); cal.setTime(new Date()); int w = cal.get(Calendar.DAY_OF_WEEK) - 1; if (w < 0) { w = 0; } return weekDays[w]; }  static String toCamelCase(String s); static String toCapitalizeCamelCase(String s); static String getIp(HttpServletRequest request); static String getCityInfo(String ip); static String getHttpCityInfo(String ip); static String getLocalCityInfo(String ip); static String getBrowser(HttpServletRequest request); static String getWeekDay(); static String getLocalIp();  }### Answer:
@Test public void testGetWeekDay() { SimpleDateFormat simpleDateformat = new SimpleDateFormat("E"); assertEquals(simpleDateformat.format(new Date()), getWeekDay()); }