New Post: Web API, OData, $inlinecount and testing

I answered your question already on stackoverflow. http://stackoverflow.com/questions/15790695/web-api-odata-inlinecount-and-testing/

Also, regarding the testability thing, we have this bug for making it easier to build inferred models used by QueryableAttribute. That issue once resolved would make it easier to build ODataQueryOptions<T> for testing.