Fixes

src/linkplay/bridge.py

@@ -163,9 +163,9 @@ async def set_play_mode(self, mode: PlayingMode) -> None:
 
     async def play_preset(self, preset_number: int) -> None:
         """Play a preset."""
-        max_number_of_presets_allowed = int(self.bridge.device.properties.get(
-            DeviceAttribute.PRESET_KEY, 10
-        ))
+        max_number_of_presets_allowed = int(
+            self.bridge.device.properties.get(DeviceAttribute.PRESET_KEY) or "10"
+        )
         if not 0 < preset_number <= max_number_of_presets_allowed:
             raise ValueError(
                 f"Preset must be between 1 and {max_number_of_presets_allowed}."

tests/linkplay/test_bridge.py

@@ -260,11 +260,32 @@ async def test_player_set_play_mode():
     )
 
 
+@pytest.mark.parametrize("preset_number", range(1, 11))
+async def test_player_play_preset_when_max_key_empty(preset_number: int):
+    """Tests if a player is able to play a preset."""
+    bridge = AsyncMock()
+    device = LinkPlayDevice(bridge)
+    player = LinkPlayPlayer(bridge)
+    bridge.device = device
+    bridge.player = player
+
+    bridge.device.properties[DeviceAttribute.PRESET_KEY] = ""
+
+    await player.play_preset(preset_number)
+
+    bridge.request.assert_called_once_with(
+        LinkPlayCommand.PLAY_PRESET.format(preset_number)
+    )
+
+
 @pytest.mark.parametrize("preset_number", range(1, 11))
 async def test_player_play_preset(preset_number: int):
     """Tests if a player is able to play a preset."""
     bridge = AsyncMock()
+    device = LinkPlayDevice(bridge)
     player = LinkPlayPlayer(bridge)
+    bridge.device = device
+    bridge.player = player
 
     await player.play_preset(preset_number)
 
@@ -283,7 +304,10 @@ async def test_player_play_preset(preset_number: int):
 async def test_player_play_preset_raises_value_error(preset_number: int):
     """Tests that a player fails in an expected way if play preset input is incorrect."""
     bridge = AsyncMock()
+    device = LinkPlayDevice(bridge)
     player = LinkPlayPlayer(bridge)
+    bridge.device = device
+    bridge.player = player
 
     with pytest.raises(ValueError):
         await player.play_preset(preset_number)