Suppress "Identifier not allowed in Android"
Based on wnc_21 answer I found that it can be disabled for a specific scope, in my case it's only used in tests so there's that.
I am not sure if you can do it in code, but you can at least disable it in the IDE. Go to "File | Settings | Editor | Inspections | Illegal Android Identifier" and disable this inspection.
Use:
@file:Suppress("IllegalIdentifier")on the top of the file