code: def test_opt_in_args(pm):
      """Verfiy that two hookimpls with mutex args can serve
      under the same spec.
      """
  
      class Api(object):
          @hookspec
          def hello(self, arg1, arg2, common_arg):
              "api hook 1"
  
      class Plugin1(object):
          @hookimpl
          def hello(self, arg1, common_arg):
              return arg1 + common_arg
  
      class Plugin2(object):
          @hookimpl
          def hello(self, arg2, common_arg):
              return arg2 + common_arg
  
      pm.add_hookspecs(Api)
      pm.register(Plugin1())
      pm.register(Plugin2())
  
      results = pm.hook.hello(arg1=1, arg2=2, common_arg=0)
      assert results == [2, 1]
  
file_path: catboost/contrib/python/pluggy/py2/tests/test_invocations.py
imports: import pytest
  from pluggy import PluginValidationError, HookimplMarker, HookspecMarker
label_desc: Use image node_id 3 for calling a global function with example usage: test_opt_in_args(pm) and returns: unknown, unknown