Add option to use SilentAudioPlayer for testing purposes

Author: voytas

src/Beep/AudioPlayer.cs

@@ -40,7 +40,11 @@ public AudioPlayer(AudioFormat audioFormat, int sampleRate = 44100, int channelC
 
         IAudioPlayer audioPlayer;
 
-        if (OperatingSystem.IsMacOS())
+        if (playerOptions.UseSilentAudioPlayer)
+        {
+            audioPlayer = new SilentAudioPlayer();
+        }
+        else if (OperatingSystem.IsMacOS())
         {
             audioPlayer = new AudioQueuePlayer(sampleRate, channelCount, playerOptions);
         }

src/Beep/PlayerOptions.cs

@@ -30,6 +30,11 @@ public sealed class PlayerOptions
     /// </summary>
     public bool ThrowOnUnsupportedPlatform { get; set; }
 
+    /// <summary>
+    /// Gets or sets a value indicating whether to use the silent audio player. This is useful for testing purposes.
+    /// </summary>
+    public bool UseSilentAudioPlayer { get; set; }
+
     internal void ThrowIfNotValid()
     {
         if (BufferSizeInBytes < 1)