public void GetKeysUnitTest()
        {
            Assert.Inconclusive("TODO");

            var target = new RangeIndex();        // TODO: Initialize to an appropriate value
            IEnumerable <object> expected = null; // TODO: Initialize to an appropriate value
            IEnumerable <object> actual;

            actual = target.GetKeys();
            Assert.AreEqual(expected, actual);
        }