public void IsLeapYear_IsNumber_True()
{
LeapYear testLeapYear = new LeapYear();
Assert.AreEqual(true, testLeapYear.IsNumber("42"));
}
public void IsLeapYear_IsNumber_False()
{
LeapYear testLeapYear = new LeapYear();
Assert.AreEqual(false, testLeapYear.IsNumber("42t"));
}