human
Solve the following python programming problem given the following code:
def environment_variable_checks(self, runner, environment_check_list) : 
    environment_vars = { 
        
} 
    def check_call_se(* args, **kwargs) : 
        for key in kwargs ['env'].keys () : 
            environment_vars [key] = kwargs ['env'] [key] 
with patch ('mrjob.runner.check_call', side_effect = check_call_se) : 
        runner._invoke_sort ([self.a], environment_vars.out) 
        for key in environment_check_list : 
            self.assertEqual (environment_vars.get (key, None), runner._opts ['local_tmp_dir']) 

    
    

    Fix the buggy line: runner._invoke_sort ([self.a], environment_vars.out)
assistant
#Here is Python program to fix the buggy line: runner.

runner._invoke_sort ([self.a], self.out)