Ability to stream a track from navidrome

tests/in_memory_music_service.ts

@@ -42,7 +42,7 @@ export class InMemoryMusicService implements MusicService {
       this.users[username] == password
     ) {
       return Promise.resolve({
-        authToken: JSON.stringify({ username, password }),
+        authToken: Buffer.from(JSON.stringify({ username, password })).toString('base64'),
         userId: username,
         nickname: username,
       });
@@ -52,7 +52,7 @@ export class InMemoryMusicService implements MusicService {
   }
 
   login(token: string): Promise<MusicLibrary> {
-    const credentials = JSON.parse(token) as Credentials;
+    const credentials = JSON.parse(Buffer.from(token, "base64").toString("ascii")) as Credentials;
     if (this.users[credentials.username] != credentials.password)
       return Promise.reject("Invalid auth token");
 
@@ -103,7 +103,17 @@ export class InMemoryMusicService implements MusicService {
             A.sort(ordString)
           )
         ),
-      tracks: (albumId: string) => Promise.resolve(this.tracks.filter(it => it.album.id === albumId))
+      tracks: (albumId: string) => Promise.resolve(this.tracks.filter(it => it.album.id === albumId)),
+      track: (trackId: string) => pipe(
+        this.tracks.find(it => it.id === trackId),
+        O.fromNullable,
+        O.map(it => Promise.resolve(it)),
+        O.getOrElse(() => Promise.reject(`Failed to find track with id ${trackId}`))
+      ),
+      stream: (_: {
+        trackId: string;
+        range: string | undefined;
+      }) => Promise.reject("unsupported operation")
     });
   }