public void IsChangedAndAcceptChangesTest()
        {
            EntityGraphTestsDomainContext ctx = new EntityGraphTestsDomainContext();

            ctx.As.Attach(a);
            var graph = new EntityGraph(a, new FullEntityGraphShape());

            Assert.IsFalse(graph.IsChanged);

            a.B.name = "Changed";
            Assert.IsTrue(graph.IsChanged);

            graph.AcceptChanges();
            Assert.IsFalse(graph.IsChanged);
        }