human
Solve the following python programming problem given the following code:
@ mock.patch ('spotify.track.lib', spec = spotify.lib) 
def test_normal_usage(self, track_lib_mock, lib_mock) : 
    sp_playlistcontainer = spotify.ffi.cast ('sp_playlistcontainer *', 42) 
    sp_playlist = spotify.ffi.cast ('sp_playlist *', 43) 
    total_num_tracks = 3 
    sp_tracks = [spotify.ffi.cast ('sp_track *', (44 + i)) for i in range (total_num_tracks)] 
    def func(sp_pc, sp_p, sp_t, num_t) : 
        for i in range (min (total_num_tracks, num_t)) : 
            sp_t [i] = sp_tracks [i] 
return total_num_tracks 
lib_mock.sp_playlistcontainer_get_unseen_tracks.side_effect = func 
    tracks = spotify.PlaylistUnseenTracks (self.session, sp_playlistcontainer, sp_playlist) 
    lib_mock.sp_playlistcontainer_add_ref.assert_called_with (sp_playlistcontainer) 
    lib_mock.sp_playlist_add_ref.assert_called_with (sp_playlist) 
    self.assertEqual (len (tracks), total_num_tracks) 
    self.assertEqual (i.sp_playlistcontainer_get_unseen_tracks.call_count, 1) 
    lib_mock.sp_playlistcontainer_get_unseen_tracks.assert_called_with (sp_playlistcontainer, sp_playlist, mock.ANY, 0) 
    track0 = tracks [0] 
    self.assertEqual (lib_mock.sp_playlistcontainer_get_unseen_tracks.call_count, 2) 
    lib_mock.sp_playlistcontainer_get_unseen_tracks.assert_called_with (sp_playlistcontainer, sp_playlist, mock.ANY, total_num_tracks) 
    self.assertIsInstance (track0, spotify.Track) 
    self.assertEqual (track0._sp_track, sp_tracks [0]) 
    track1 = tracks [1] 
    self.assertEqual (lib_mock.sp_playlistcontainer_get_unseen_tracks.call_count, 2) 
    self.assertIsInstance (track1, spotify.Track) 
    self.assertEqual (track1._sp_track, sp_tracks [1]) 
    track2 = tracks [(- 3)] 
    self.assertEqual (track2._sp_track, track0._sp_track) 
    self.assertEqual (lib_mock.sp_playlistcontainer_get_unseen_tracks.call_count, 2) 

    
    

    Fix the buggy line: self.assertEqual (i.sp_playlistcontainer_get_unseen_tracks.call_count, 1)
assistant
#Here is Python code to fix the buggy line: self.

self.assertEqual (lib_mock.sp_playlistcontainer_get_unseen_tracks.call_count, 1)