Unit tests!

[FUMR-bot]

• login process (not sure how to do this - it's interactive oauth2)
• session refreshing
• Track
  • loading track info
  • downloading tracks
  • track lyrics
  • track metadata generation
• loading album info
  • listing tracks from albums
• loading playlist info
  • listing tracks from playlists
• loading artists
  • listing albums from artists
• loading cover arts
• parsing URLs
• searching
• extracting client_id from Tidal Android .apk
• TidalMultiSession tests (what kind of?)
• caching TidalObject creation
  • caching of tracks
  • caching of albums
  • caching of playlists
  • caching of artists

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This issue has been automatically created by todo-actions based on a TODO comment found in tests/test_tidal_async.py:9. It will automatically be closed when the TODO comment is removed from master.