PnP.Core - How to set the Values property In IListItem for test mocking?

[JustinCLyon]

When attempting to implement unit tests for my application, I've run into an issue in setting the values property for an IListItem.

I was successful in mocking the return values when indexing (example: listItem[FileLeafRef]), however the Values seems to use a TransientDictionary instead of a Dictionary<string, object>. Since TransientDictionary has no public constructor, there's no way for me to construct the object, and I can't just return a Dictionary<string, object> either.

Are there any solutions for this?

Update: I used reflection to make a temporary solution for this, however I was wondering if there was a more elegant way to mock the list item field values?