public void GetDifferences_NoDiff()
        {
            QueryData target = new QueryData ();
            QueryData obj = new QueryData ();

            target.Add ( new object[] { "a", 1, "c" } );
            obj.Add ( new object[] { "a", 1, "c" } );

            target.Add ( new object[] { "x", 2, "z" } );
            obj.Add ( new object[] { "x", 2, "z" } );

            Assert.AreEqual ( 0, target.GetDifferences ( obj ).Count () );
        }