It seems to me that there are three Kotlin language constructs that are of interest to a Koltin code coverage tool: 1. property initialization (top level, class and inside a function, including arguments). 2. statement and expression execution inside functions (top level, methods of a class and local functions). 3. class constructor argument initialization. (Could these be considered properties?) Surely it cannot be that simple, or can it? Granted, the second item breaks down into a number of items of interest, especially 

if

 and 

when

.

Remember something like

class Test(val a = run{ whateverIWant() })

is fine, so you have to handle arbitrary code. Plus lambdas may not be ran right away, i.e.

lazy

.

Good points. I'll plan on having test cases for both.