Unit testing FFImageLoading and calling CachedImageRenderer.Init?

I am trying to create unit test that calls methods that are dependent of FFImageLoading.Forms.CachedImage
. I get this exception:
System.Exception: Please call CachedImageRenderer.Init method in a platform specific project to use FFImageLoading!
How can I call this method from a test project? Will I have to create platform specific code snippet that calls init? Or is there any other way around it?