Implement audio management system with effects and music players; add settings for sound and music volume

tests/test_music_player.gd

@@ -0,0 +1,54 @@
+extends SceneTree
+
+var checks: int = 0
+var failures: int = 0
+
+
+func _initialize() -> void:
+    call_deferred("run")
+
+
+func check(condition: bool, message: String) -> void:
+    checks += 1
+    if not condition:
+        failures += 1
+        push_error(message)
+
+
+func run() -> void:
+    var player := OwniverseMusicPlayer.new()
+    root.add_child(player)
+    await process_frame
+
+    check(player.last_track == "", "Music player starts with silence")
+    check(player._pause_timer.time_left >= player.MIN_PAUSE_SECONDS and player._pause_timer.time_left <= player.MAX_PAUSE_SECONDS, "Initial pause is between two and five minutes")
+    player._pause_timer.stop()
+    player._play_next()
+    check(player.last_track != "", "Music player selects an initial track")
+    check(player.last_track != player.EXCLUDED_TRACK, "Normal playlist excludes apocalypse")
+    var previous: String = player.last_track
+    player._play_next()
+    check(player.last_track != previous, "Consecutive tracks do not repeat")
+    check(player.last_track != player.EXCLUDED_TRACK, "Subsequent tracks exclude apocalypse")
+
+    var last_normal_track: String = player.last_track
+    player.play_apocalypse()
+    check(player.stream == player._music[player.EXCLUDED_TRACK] and player.playing, "Apocalypse music starts immediately")
+    check(player.last_track == last_normal_track, "Apocalypse does not replace the last normal track")
+
+    player._schedule_pause()
+    check(player._pause_timer.time_left >= player.MIN_PAUSE_SECONDS and player._pause_timer.time_left <= player.MAX_PAUSE_SECONDS, "Pause is between two and five minutes")
+    player.set_enabled(false)
+    check(player.stream_paused and player._pause_timer.paused, "Disabling music pauses playback and scheduling")
+    var disabled_stream: AudioStream = player.stream
+    player.play_apocalypse()
+    check(player.stream == disabled_stream, "Apocalypse does not start while music is disabled")
+    player.set_enabled(true)
+    check(not player.stream_paused and not player._pause_timer.paused, "Enabling music resumes playback and scheduling")
+
+    player.stop()
+    player.stream = null
+    player.free()
+    await process_frame
+    print("Music player: %d checks, %d failures" % [checks, failures])
+    quit(0 if failures == 0 else 1)