### Question:
ParamChecker { public static int checkGEZero(int value, String name) { if (value < 0) { throw new IllegalArgumentException(XLog.format( "parameter [{0}] = [{1}] must be greater than or equals zero", name, value)); } return value; }  static String notEmpty(String str, String name); static String notEmpty(String str, String name, String info); static List<String> notEmptyElements(List<String> list, String name); static String validateActionName(String actionName); static boolean isValidIdentifier(String token); static int checkGTZero(int value, String name); static int checkGEZero(int value, String name); static int checkLEZero(int value, String name); static int checkInteger(String val, String name); static String checkFrequency(String val); static Date checkDateOozieTZ(String date, String name); static TimeZone checkTimeZone(String tzStr, String name); static boolean isMember(String item, String[] members, String name);  }### Answer:
@Test public void testCheckGEZero() { assertEquals(120, ParamChecker.checkGEZero(120, "test")); assertEquals(0, ParamChecker.checkGEZero(0, "test")); try { ParamChecker.checkGEZero(-1, "test"); fail(); } catch (Exception ex) { } }