mocking properties/fields

Unfortunately the following doesn’t work:

open class ClassUnderTest ( val property:String )
val mock = mock<ClassUnderTest>()
whenever( mock.property ).thenReturn("value")
assert( mock.property == "value" )

because:

when() requires an argument which has to be ‘a method call on a mock’

I think I understand the root cause of this but it still would be extremely helpful. I think while accessing variables directly is often considered a code smell in Java it is quite common for Kotlin.

Do you see any chance to be able to change that behaviour?

[nhaarman]

The property val needs to be open as well:

open class ClassUnderTest (open val property:String )

The relevant part in the error message:

Also, this error might show up because:
1. you stub either of: final/private/equals()/hashCode() methods.
   Those methods *cannot* be stubbed/verified.
   Mocking methods declared on non-public parent classes is not supported.

[rachitmishra]

Nope, Then I started using stubs for the above issue. Also a lot of other testing problems got resolved by using mockk lib.