public void AddIndex_WithStartIndexSpecified_ProducesCorrectResults()
{
IEnumerable <string> collection = new[]
{
"A", "B", "C"
};
var output = CollectionExtensions.AddIndex(collection, 42);
CollectionAssert.AreEqual(new[]
{
new IndexedElement <string>(42, "A"),
new IndexedElement <string>(43, "B"),
new IndexedElement <string>(44, "C")
}, output);
}
public void AddIndex_NullCollection_ThrowsArgumentNullException()
{
IEnumerable <int> collection = null;
Assert.Throws <ArgumentNullException>(() => CollectionExtensions.AddIndex(collection));
}
