public void AsArray_Enumerable()
        {
            var xs = new[] { 2, 3, 5 }.Select(x => x);

            var ys = CollectionExtensions.AsArray(xs);

            Assert.IsTrue(xs.SequenceEqual(ys));
        }
        public void AsArray_Null()
        {
            var xs = default(int[]);

            var ys = CollectionExtensions.AsArray(xs);

            Assert.AreEqual(0, ys.Length);
        }
        public void AsArray_Array()
        {
            var xs = new[] { 2, 3, 5 };

            var ys = CollectionExtensions.AsArray(xs);

            Assert.AreSame(xs, ys);
        }