### Question:
ParamChecker { public static int checkInteger(String val, String name) { int ret; try { ret = Integer.parseInt(val); } catch (NumberFormatException nex) { throw new IllegalArgumentException(XLog.format( "parameter [{0}] = [{1}] must be an integer. Parsing error {2}", name, val, nex.getMessage(), nex)); } return ret; }  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 testCheckInteger() { assertEquals(120, ParamChecker.checkInteger("120", "test")); assertEquals(-12, ParamChecker.checkInteger("-12", "test")); try { ParamChecker.checkInteger("ABCD", "test"); fail(); } catch (Exception ex) { } try { ParamChecker.checkInteger("1.5", "test"); fail(); } catch (Exception ex) { } }