def METHOD_NAME(pm: PluginManager) -> None:
    """Verify that two hookimpls with mutex args can serve
    under the same spec.
    """
    class Api:
        @hookspec
        def hello(self, arg1, arg2, common_arg):
            "api hook 1"
    class Plugin1:
        @hookimpl
        def hello(self, arg1, common_arg):
            return arg1 + common_arg
    class Plugin2:
        @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]