I couldn't find anything about extension properties, neither in the documentation, nor issues on Github, nor stackoverflow, etc. I wonder if this is something so clear for everyone that doesn't need explanation and I'm just missing something

kotlin property in itself translates to generated getters and setters. So extension property == extension method in the end

Yeah you are right. I realized it after checking the bytecode. But do you know how to mock it?

No, but I imagine it's gonna be simmilar to extension method mocking

Maybe. I was able to mock extension function but not extension property though.