#14: Add track number to available placeholders [add unit test for custom metadata field]

Author: Aldaviva

Test/Business/NowPlayingToFileManagerTest.cs

@@ -327,4 +327,15 @@ public void uncaughtException() {
         actual!.song.Should().BeSameAs(song);
     }
 
+    [Fact]
+    public void queryCustomMetadataFieldFromWinamp() {
+        A.CallTo(() => winampController.fetchMetadataFieldValue("CustomField")).Returns("CustomValue");
+
+        A.CallTo(() => settings.textTemplate).Returns("{{CustomField}}");
+        settings.settingsUpdated += Raise.WithEmpty();
+
+        File.ReadAllText(textFilename).Should().Be("CustomValue");
+        A.CallTo(() => winampController.fetchMetadataFieldValue("CustomField")).MustHaveHappenedOnceExactly();
+    }
+
 }

WinampNowPlayingToFile/Facade/WinampControllerImpl.cs

@@ -68,18 +68,19 @@ public void stop() {
 
     public object fetchMetadataFieldValue(string metadataFieldName) {
         metadataFieldName = metadataFieldName.ToLowerInvariant();
+        string songFilename = winamp.CurrentSong.Filename;
 
         try {
             if (metadataFieldName == "filebasename") {
-                return Path.GetFileName(winamp.CurrentSong.Filename);
+                return Path.GetFileName(songFilename);
             } else if (metadataFieldName == "filebasenamewithoutextension") {
-                return Path.GetFileNameWithoutExtension(winamp.CurrentSong.Filename);
+                return Path.GetFileNameWithoutExtension(songFilename);
             }
         } catch (ArgumentException) {
             return string.Empty;
         }
 
-        string value = getMetadata(winamp.CurrentSong.Filename, metadataFieldName);
+        string value = getMetadata(songFilename, metadataFieldName);
 
         return metadataFieldName switch {
             "length" when long.TryParse(value, out long length)                                                     => TimeSpan.FromMilliseconds(length),