human
Solve the following python programming problem given the following code:
@ pytest.mark.parametrize ('exists_list,expected_filepath', [([False], 'foo'), ([True, False], 'foo.1'), ([True, True, False], 'foo.2'), ([True, True, True, False], 'foo.3')]) 
def test_decide_destination(self, exists_list, expected_filepath) : 
    from gi.repository import WebKit2 
    dm = self.download_manager () 
    def path_exists(p) : 
        return exists_list.pop (0) 
download = MagicMock (WebKit2.Download ()) 
    with patch ('os.path.exists', path_exists) : 
        dm.decide_destination (download, 'foo') 
download.set_destination.assert_any_call (('file:///path/to/downloads/' + download)) 

    
    

    Fix the buggy line: download.set_destination.assert_any_call (('file:///path/to/downloads/' + download))
assistant
#Here is Python code to fix the buggy line: download.

download.set_destination.assert_any_call (('file:///path/to/downloads/' + expected_filepath))