Add spotify integration

tests/fakes.py

@@ -31,6 +31,7 @@ class FakeHeos(threading.Thread):
         self.play_states = {pid: "play" for pid in self.NAMES}
         self.group_volumes = {3: 25}
         self.now_playing_mid = {1: "inputs/mediaplayer"}  # pid -> what get_now_playing_media reports
+        self.now_playing_sid = {}                     # pid -> its source id; 4 is Spotify
         self.commands = []                            # everything we were asked to do
         self.server = socket.socket()
         self.server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
@@ -120,7 +121,10 @@ class FakeHeos(threading.Thread):
             pid = int(args["pid"])
             mid = self.now_playing_mid.get(pid, "")
             name = next((s["name"] for s in self.AVR_INPUTS if s["mid"] == mid), mid)
-            return self._ok(path, payload={"mid": mid, "station": name} if mid else {})
+            payload = {"mid": mid, "station": name} if mid else {}
+            if pid in self.now_playing_sid:
+                payload["sid"] = self.now_playing_sid[pid]
+            return self._ok(path, payload=payload)
 
         if path == "browse/browse":
             sid = int(args["sid"])