public void MinusMinusOperator_EqualsPreviousDay(DayPairTestItem dayPairTestItem)
{
var(day, previousDay) = dayPairTestItem.CreatePair();
day--;
Assert.AreEqual(previousDay, day);
}
public void PlusPlusOperator_EqualsNextDay(DayPairTestItem dayPairTestItem)
{
var(day, nextDay) = dayPairTestItem.CreatePair();
day++;
Assert.AreEqual(nextDay, day);
}