Test: simplify test case

tests/test_mixer_queue_tns.liq

@@ -28,18 +28,6 @@ fallback_folder =
   playlist(id="fallback_folder", "../audio/fallback", mode="randomize")
 fallback_folder = mksafe(fallback_folder)
 
-# Event handlers
-def on_metadata_notification(meta) =
-  print(
-    "on_metadata - update (TRACK: #{meta['title']}, ON AIR: #{meta['on_air']}"
-  )
-end
-def on_track_notification(meta) =
-  print(
-    "on_track    - update (TRACK: #{meta['title']}, ON AIR: #{meta['on_air']}"
-  )
-end
-
 # Create mixer with one queue
 in_queue = request.queue(id="in_queue")
 input_queue_0 =
@@ -49,8 +37,6 @@ stripped_mixer = blank.strip(max_blank=5., mixer)
 
 # Output
 main_out = fallback(track_sensitive=false, [stripped_mixer, fallback_folder])
-main_out.on_metadata(on_metadata_notification)
-main_out.on_track(on_track_notification)
 output.jack(id="pcm.aura_engine", mksafe(main_out))
 
 ##################################################################################################
@@ -70,35 +56,16 @@ print(
 )
 
 # 3. Wait 5 seconds and activate queue via server commands
-def enable_queue() =
+def show_mixer() =
   print(
-    "Activate queue"
+    "Show mixer.inputs"
   )
-  r =
-    server.execute(
-      "mixer.select 0 true"
-    )
+  r = server.execute("mixer.inputs")
   print(r)
-  r =
-    server.execute(
-      "mixer.volume 0 1"
-    )
+  print(
+    "Show all functions::"
+  )
+  r = server.execute("help")
   print(r)
 end
-thread.run(delay=5., {enable_queue()})
-
-# 4. Metadata is issued instantly (after the 5 seconds from above):
-#
-# on_metadata - update (TRACK: Two Pianos), ON AIR: 2022/08/02 12:58:03
-# on_track    - update (TRACK: Two Pianos), ON AIR: 2022/08/02 12:58:03
-
-
-# 5.
-#
-# FAILURE: When ALSA is used as a PulseAudio Plugin.
-# Audio from the queue starts playing only approx. 23 seconds later
-# This delay of 23 seconds is always the same, no matter when the server commands
-# are issued (e.g. 30secs later) nor how many requests are pushed to the queue
-#
-# SUCCESS: When ALSA is used directly, ensuring any PulseAudio server is shut down.
-# Queued audio is played at the same time, as the metadata from 4.) is issued.
\ No newline at end of file
+thread.run(delay=5., {show_mixer()})