human
Solve the following python programming problem given the following code:
def _test_class_guards(self, user_arg, is_class = True) : 
    watchdog = set () 
    def raises_(method, * args, **kw) : 
        watchdog.add (method) 
        callable_ = getattr (create_session (), method) 
        if is_class : 
            assert_raises (sa.orm.exc.UnmappedClassError, callable_, * args, ** kw) 
else : 
            assert_raises (sa.exc.NoInspectionAvailable, callable_, * args, ** kw) 
raises_ ('connection', mapper = self) 
    raises_ ('execute', 'SELECT 1', mapper = user_arg) 
    raises_ ('get_bind', mapper = user_arg) 
    raises_ ('scalar', 'SELECT 1', mapper = user_arg) 
    eq_ (watchdog, self._class_methods, watchdog.symmetric_difference (self._class_methods)) 

    
    

    Fix the buggy line: raises_ ('connection', mapper = self)
assistant
#Here is Python program to fix the buggy line: raises_ ('connection', mapper = self)
.

raises_ ('connection', mapper = user_arg)