Cannot verify parent method invocation

It seems like method invocation via `verifyInvoked*()` only works on double instances but not for `parent::` method calls. Example:

``` php
class ParentClass {
public function hello() {
echo 'Hello';
}
}

class ChildClass extends ParentClass {
public function hello() {
parent::hello();
echo ' World';
}
}

test::double(ParentClass::class, ['hello']);

$c = new ChildClass();
$c->hello();
```

How would one verify that `ParentClass::hello` was invoked?