Scenario

• JaCoCo version: 0.8.5
• Operating system: MacOS
• Tool integration: Gradle, Kotlin

Current Behaviour

Kotlin Interface default implementations like

interface SomeInterface {
    fun someFunction() = // Default implementation
}

Will lead to JaCoCo reporting uncovered functions for implementations of those interfaces:

class SomeImplementation: SomeInterface {

}

This is because of the Kotlin compiler effectively adding the default implementation to the compiled class like

public class SomeImplementation implements SomeInterface {
    
    public void someFunction() {
        DefaultImpls.someFunction(this)
    } 

}

Wanted Behaviour

I would like to have those default implementations ignored from JaCoCo. To cover those, it should be fine just to cover the default implementation once.