def callback(test_obj, obj, user_param1, ...)
Test transfer none GObject as a param (tests refcounting). Use with regress_test_obj_emit_sig_with_obj
test_obj
instance of that is emitting the signal
obj
A newly created RegressTestObj
user_param1
first user parameter (if any) specified with the connect() method
...
additional user parameters (if any)