How to view dumps when called within a class?

I’m calling kint d() function from within a class but I can’t get any output into the kint console. This is similar to what I have.

add_action( 'wp_loaded', 'viewClassVar');
function veiwClassVar(){
  $obj = new classVar;
  $obj->dumpVar;
  d( $obj);
}

class classVar {
  public function dumpVar() {
    $test = "this is a test";
    d( $test);
  }
}

The action d( $obj) works fine, but d( $test) from within the class method doesn’t show anything. Is there a way to be able to see dumps executed from within a class?

Thanks,
-Norm