public void AtOrDefault_FromEnumerableExtensions_ReturnsCorrectValues(int index, int length)
{
var source = Enumerable.Range(0, length);
var sut = EnumerableExtensions.AtOrDefault(source, index);
if (index < 0)
{
index = length + index;
}
Assert.Equal(index, sut);
}
public void AtOrDefault_FromEnumerableExtensions_GivenIndexOurOfRange_ReturnsNull_WhenExecutedOnReferenceCollection(int index, int collectionLength)
{
var source = Enumerable.Range(0, collectionLength).Select(x => x.ToString());
Assert.Equal(null, EnumerableExtensions.AtOrDefault(source, index));
}
public void AtOrDefault_FromEnumerableExtensions_GivenIndexOurOfRange_ReturnsDefaultValue_WhenExecutedOnValueCollection(int index, int length)
{
var source = Enumerable.Range(0, length);
Assert.Equal(default(int), EnumerableExtensions.AtOrDefault(source, index));
}
public void AtOrDefault_FromEnumerableExtensions_GivenNullSource_ThrowsArgumentNullException()
{
Assert.Throws <ArgumentNullException>(() => EnumerableExtensions.AtOrDefault <int>(null, 0));
}