Intellij : Find usages , but exclude test files from results
In the Find usages result panel, you can group by test/production. There is a button for that.
Intellij Ultimate 11 version has an option to search in "Project production files".
Just press Alt+F7 on a usage and look on Scope.
I found this answer extremely helpful:
https://stackoverflow.com/a/45958976/5449497
By putting !*Test.java into the File Mask textfield you can exclude Testfiles from your search results within the project.