Add spotify integration

tests/test_panel.py

@@ -174,6 +174,18 @@ class PanelTest(unittest.TestCase):
         self.panel.toggle_play("living_room_group", "pause")
         self.assertEqual(self.heos.play_states[3], "pause")
 
+    def test_state_says_which_rooms_are_playing_spotify(self):
+        """The cards only offer play/pause for a Spotify stream, so the
+        snapshot has to say which rooms have one."""
+        self.heos.now_playing_mid[HOME400_PID] = "spotify:track:4uLU6hMCjMI75M1A2tKUQC"
+        self.heos.now_playing_sid[HOME400_PID] = 4
+        state = self.panel.state()
+        self.assertEqual([r["spotify"] for r in state["rooms"]], [True, False])
+
+    def test_an_avr_input_is_not_spotify(self):
+        self.heos.now_playing_sid[AVR_PID] = 1027
+        self.assertFalse(self.panel.on_spotify("avr"))
+
     # -- the AVR, entirely over HEOS --------------------------------------
     def test_avr_inputs_carry_your_renamed_labels(self):
         """HEOS reports the AVR's own renamed sources itself (browse/browse