public void testEmpty()
        {
            HGrid g = new HGridBuilder().toGrid();

            Assert.AreEqual(g.meta, HDict.Empty);
            Assert.AreEqual(g.numRows, 0);
            Assert.IsTrue(g.isEmpty());
            Assert.IsNull(g.col("foo", false));
            try
            {
                g.col("foo"); Assert.Fail();
            }
            catch (UnknownNameException)
            {
                Assert.IsTrue(true);
            }
        }