test(visualizer): cover the new modes and the full v cycle

tests/test_app.py

@@ -6,6 +6,7 @@ from datetime import datetime, timedelta, timezone
 
 import pytest
 
+from somafm_tui import config
 from somafm_tui.api import Song
 from somafm_tui.app import SomaFMApp
 from somafm_tui.widgets.help import HelpScreen
@@ -70,11 +71,11 @@ async def test_boot_navigation_filter_favourite_visualizer_help() -> None:
         assert app.index == 0
 
         modes = set()
-        for _ in range(3):
+        for _ in range(len(config.VISUALIZERS)):
             await pilot.press("v")
             await pilot.pause()
             modes.add(app.visualizer)
-        assert modes == {"both", "bars", "wave"}
+        assert modes == set(config.VISUALIZERS)
 
         await pilot.press("question_mark")
         await pilot.pause()