public void TestCreateDictionaryWithCSharpDictionary()
        {
            var dict = new Dictionary <string, object> {
                ["street"] = "1 Main street",
                ["city"]   = "Mountain View",
                ["state"]  = "CA"
            };
            var address = new MutableDictionaryObject(dict);

            address.ShouldBeEquivalentTo(dict, "because that is what was stored");
            address.ToDictionary().ShouldBeEquivalentTo(dict, "because that is what was stored");

            var doc1 = new MutableDocument("doc1");

            doc1.SetDictionary("address", address);
            doc1.GetDictionary("address")
            .Should()
            .BeSameAs(address, "because the document should return the same instance");

            Db.Save(doc1);
            var gotDoc = Db.GetDocument("doc1");

            gotDoc.GetDictionary("address")
            .ToDictionary()
            .ShouldBeEquivalentTo(dict, "because the content should not have changed");
        }