public void ElementAtOrDefault()
{
Assert.Equal(Enumerable.ElementAtOrDefault(manyElements, -1), ImmutableArrayExtensions.ElementAtOrDefault(manyElements, -1));
Assert.Equal(Enumerable.ElementAtOrDefault(manyElements, 3), ImmutableArrayExtensions.ElementAtOrDefault(manyElements, 3));
Assert.Throws <InvalidOperationException>(() => Enumerable.ElementAtOrDefault(emptyDefault, 0));
Assert.Throws <NullReferenceException>(() => ImmutableArrayExtensions.ElementAtOrDefault(emptyDefault, 0));
Assert.Equal(0, ImmutableArrayExtensions.ElementAtOrDefault(empty, 0));
Assert.Equal(0, ImmutableArrayExtensions.ElementAtOrDefault(empty, 1));
Assert.Equal(1, ImmutableArrayExtensions.ElementAtOrDefault(oneElement, 0));
Assert.Equal(3, ImmutableArrayExtensions.ElementAtOrDefault(manyElements, 2));
}
