How to fake web.AllProperties

Hi,

How can we fake web.AllProperties. I can add a property using web.Properties however in my code, i am using web.AllProperties, if i try to add a mock property using fakeSite.OpenWeb().AllProperties.Add("Max_Personal_Links","10"); it throws object ref exception as AllProperties returns null whereas Isolate.WhenCalled(() => fakeSite.OpenWeb().Properties["Max_Personal_Links"]).WillReturn("10"); works fine.

Please help:(