public void DateCalc06_ValidDateCtor()
 {
     Assert.AreEqual("1/1/2000", Ex2hCalculation.DateCalc06("2000", "1", "1"));
 }
 public void DateCalc06_YearNumFmtExcept()
 {
     Assert.AreEqual("Invalid input", Ex2hCalculation.DateCalc06("", "01", "01"));
 }
 public void DateCalc06_DateArgRangeExcept()
 {
     Assert.AreEqual("Invalid input", Ex2hCalculation.DateCalc06("2000", "13", "01"));
 }