### Question:
CommonUtil { public static String DateToDayString(Date date) { String pattern = "yyyy-MM-dd"; SimpleDateFormat simpleDateFormat = new SimpleDateFormat(pattern); return simpleDateFormat.format(date); } private  CommonUtil(); static boolean isEmpty(List list); static boolean isBlank(String str); static String sanitize(String v); static String DateToDayString(Date date); static Date dayToDate(String day); static String convertToString(List<String> list); static Map convertToMap(Object object); static List<String> removeStringFromItems(List<String> list, String toRemove); static Integer determinePriceCatForCPM(double price); static Integer determinePriceCatForCPC(double price); static Integer determinePriceCatForCPD(double price); static Integer determinePriceCatForCPT(double price); static Integer determinePriceCat(double price, TargetingChannel.PriceModel priceModel); static String removeEscapingCharacters(String str); static boolean equalNumbers(double d1, double d2);  }### Answer:
@Test public void dateToDayString() throws ParseException { String s = "2018-11-10"; Date date = new SimpleDateFormat("yyyy-MM-dd").parse(s); assertEquals(s, CommonUtil.DateToDayString(date)); }