//[TestCase(999, 2, 1a, false)]
public void CheckValidDate(int year, int month, int day, bool expected)
{
CheckDateMethod test = new CheckDateMethod();
Assert.AreEqual(expected, test.IsValidDate(year, month, day));
}
public void CheckDayInMonth(int year, int month, int expected)
{
CheckDateMethod test = new CheckDateMethod();
Assert.AreEqual(expected, actual: test.DaysInMonth(year, month));
}
