Why Resharper does not recognize referenced project in Unit Test

Question

I'm facing this issue with Resharper in a Unit Test Project class.

It does not recognize my referenced main project (and also all its objects) arguing:

Cannot resolve symbol "[Project Namespace]"
Using directive is not required by the code and it can be safetly removed

I could disable this feature in options by it works nice in a common project, this problem only happens in my Unit Test Project, as far as I could see.

Answer 1

This is usually a sign of the ReSharper cache going stale or out of touch with the solution. I've experienced it a lot with the 7.x version of ReSharper, and I've yet to experience it with 8.x so it might be a bug they've fixed.

Anyway, to fix it, go to the ReSharper options, under Environment and General, and find the cache settings near the bottom:

Click the Clear Caches button and then reload your solution. Problem should be fixed now.