public void At_FromEnumerableExtensions_ReturnsCorrectValues(int index, int length)
{
var source = Enumerable.Range(0, length);
var sut = EnumerableExtensions.At(source, index);
if (index < 0)
{
index = length + index;
}
Assert.Equal(index, sut);
}
public void At_FromEnumerableExtensions_GivenIndexOurOfRange_ThrowsIndexOurOfRangeException(int index, int length)
{
var source = Enumerable.Range(0, length);
Assert.Throws <IndexOutOfRangeException>(() => EnumerableExtensions.At(source, index));
}
public void At_FromEnumerableExtensions_GivenNullSource_ThrowsArgumentNullException()
{
Assert.Throws <ArgumentNullException>(() => EnumerableExtensions.At <int>(null, 0));
}