public void YieldAllInstances_WhenCalled_ReturnsASingleInstance()
{
var single = new SingleDaySchedule(DateTime.MinValue);
var count = single.YieldAllInstances().Count();
Assert.That(count, Is.EqualTo(1));
}
public void GetInstance_WhenCalledWithZeroIndex_MatchesFirstYieldedInstance()
{
var single = new SingleDaySchedule(DateTime.MinValue);
var first = single.YieldAllInstances().First();
var zero = single.GetInstance(0);
Assert.That(zero, Is.EqualTo(first));
}
public void GetInstance_WhenCalledWithPositiveNonZeroIndex_ReturnsNull(int index)
{
Assume.That(index, Is.GreaterThan(0));
var single = new SingleDaySchedule(DateTime.MinValue);
var instance = single.GetInstance(index);
Assert.That(instance, Is.Null);
}
public void GetInstance_WhenCalledWithZeroIndex_DoesNotReturnNull()
{
var single = new SingleDaySchedule(DateTime.MinValue);
var instance = single.GetInstance(0);
Assert.That(instance, Is.Not.Null);
}
public void GetInstance_WhenCalledWithNegativeIndex_ThrowsException(int index)
{
Assume.That(index, Is.LessThan(0));
var single = new SingleDaySchedule(DateTime.MinValue);
Assert.That(() => single.GetInstance(index), Throws.InstanceOf<ArgumentOutOfRangeException>());
}