I'm not sure it's the same as extension functions. I had checked this part of the documentation before and it doesn't say anything about extension properties. I did check the bytecode and the extension property is turned into a static function, so for my example there's static

getSomeProperty()

function. But how could I access this function from my tests? Just doing

every { spy.someProperty }.returns("test")

doesn't work. I also tried mocking the generated function (

getSomeProperty()

) using dynamic calls but didn't work either (I believe dynamic calls are for private properties/functions only)