public void string_length()
        {
            A.CallTo(() => _provider.Length("Title")).Returns("len(Title)");
            Get(d => d.Title.Length == 2).Should().Be("(len(Title) = @0)");

            FirstParameter.Should().Be(2);
        }
        private void HandleStringProperties(MemberExpression node)
        {
            var name = (node.Expression as MemberExpression).Member.Name;

            switch (node.Member.Name)
            {
            case "Length":
                _sb.Append(_provider.Length(name));
                break;
            }
        }