diff --git a/README.rst b/README.rst
index 766d5354..9bca444e 100644
--- a/README.rst
+++ b/README.rst
@@ -4,7 +4,7 @@ Mopidy
 
 Mopidy is an `MPD <http://mpd.wikia.com/>`_ server with a
 `Spotify <http://www.spotify.com/>`_ backend. Using a standard MPD client you
-can search for music in Spotify's wast archive, manage Spotify play lists and
+can search for music in Spotify's vast archive, manage Spotify play lists and
 play music from Spotify.
 
 Mopidy is currently under development. Unless you want to contribute to the
diff --git a/docs/_static/.placeholder b/docs/_static/.placeholder
new file mode 100644
index 00000000..e69de29b
diff --git a/docs/_themes/nature/static/nature.css_t b/docs/_themes/nature/static/nature.css_t
index 03b0379d..8762e019 100644
--- a/docs/_themes/nature/static/nature.css_t
+++ b/docs/_themes/nature/static/nature.css_t
@@ -10,8 +10,8 @@
 body {
     font-family: Arial, sans-serif;
     font-size: 100%;
-    background-color: #111;
-    color: #555;
+    background-color: #111111;
+    color: #555555;
     margin: 0;
     padding: 0;
 }
@@ -22,7 +22,7 @@ div.documentwrapper {
 }
 
 div.bodywrapper {
-    margin: 0 0 0 230px;
+    margin: 0 0 0 300px;
 }
 
 hr{
@@ -30,14 +30,14 @@ hr{
 }
  
 div.document {
-    background-color: #eee;
+    background-color: #fafafa;
 }
  
 div.body {
     background-color: #ffffff;
     color: #3E4349;
-    padding: 0 30px 30px 30px;
-    font-size: 0.8em;
+    padding: 1em 30px 30px 30px;
+    font-size: 0.9em;
 }
  
 div.footer {
@@ -49,25 +49,29 @@ div.footer {
 }
  
 div.footer a {
-    color: #444;
-    text-decoration: underline;
+    color: #444444;
 }
  
 div.related {
     background-color: #6BA81E;
-    line-height: 32px;
-    color: #fff;
-    text-shadow: 0px 1px 0 #444;
-    font-size: 0.80em;
+    line-height: 36px;
+    color: #ffffff;
+    text-shadow: 0px 1px 0 #444444;
+    font-size: 1.1em;
 }
  
 div.related a {
     color: #E2F3CC;
 }
- 
+
+div.related .right {
+    font-size: 0.9em;
+}
+
 div.sphinxsidebar {
-    font-size: 0.75em;
+    font-size: 0.9em;
     line-height: 1.5em;
+    width: 300px
 }
 
 div.sphinxsidebarwrapper{
@@ -77,46 +81,46 @@ div.sphinxsidebarwrapper{
 div.sphinxsidebar h3,
 div.sphinxsidebar h4 {
     font-family: Arial, sans-serif;
-    color: #222;
+    color: #222222;
     font-size: 1.2em;
-    font-weight: normal;
+    font-weight: bold;
     margin: 0;
     padding: 5px 10px;
-    background-color: #ddd;
     text-shadow: 1px 1px 0 white
 }
 
-div.sphinxsidebar h4{
-    font-size: 1.1em;
-}
- 
 div.sphinxsidebar h3 a {
-    color: #444;
+    color: #444444;
 }
- 
- 
+
 div.sphinxsidebar p {
-    color: #888;
+    color: #888888;
     padding: 5px 20px;
+    margin: 0.5em 0px;
 }
  
 div.sphinxsidebar p.topless {
 }
  
 div.sphinxsidebar ul {
-    margin: 10px 20px;
+    margin: 10px 10px 10px 20px;
     padding: 0;
-    color: #000;
+    color: #000000;
 }
  
 div.sphinxsidebar a {
-    color: #444;
+    color: #444444;
 }
- 
+
+div.sphinxsidebar a:hover {
+    color: #E32E00;
+}
+
 div.sphinxsidebar input {
-    border: 1px solid #ccc;
+    border: 1px solid #cccccc;
     font-family: sans-serif;
-    font-size: 1em;
+    font-size: 1.1em;
+    padding: 0.15em 0.3em;
 }
 
 div.sphinxsidebar input[type=text]{
@@ -132,7 +136,6 @@ a {
  
 a:hover {
     color: #E32E00;
-    text-decoration: underline;
 }
  
 div.body h1,
@@ -142,20 +145,20 @@ div.body h4,
 div.body h5,
 div.body h6 {
     font-family: Arial, sans-serif;
-    background-color: #BED4EB;
     font-weight: normal;
     color: #212224;
     margin: 30px 0px 10px 0px;
-    padding: 5px 0 5px 10px;
-    text-shadow: 0px 1px 0 white
+    padding: 5px 0 5px 0px;
+    text-shadow: 0px 1px 0 white;
+    border-bottom: 1px solid #C8D5E3;
 }
  
-div.body h1 { border-top: 20px solid white; margin-top: 0; font-size: 200%; }
-div.body h2 { font-size: 150%; background-color: #C8D5E3; }
-div.body h3 { font-size: 120%; background-color: #D8DEE3; }
-div.body h4 { font-size: 110%; background-color: #D8DEE3; }
-div.body h5 { font-size: 100%; background-color: #D8DEE3; }
-div.body h6 { font-size: 100%; background-color: #D8DEE3; }
+div.body h1 { margin-top: 0; font-size: 200%; }
+div.body h2 { font-size: 150%; }
+div.body h3 { font-size: 120%; }
+div.body h4 { font-size: 110%; }
+div.body h5 { font-size: 100%; }
+div.body h6 { font-size: 100%; }
  
 a.headerlink {
     color: #c60f0f;
@@ -170,7 +173,7 @@ a.headerlink:hover {
 }
  
 div.body p, div.body dd, div.body li {
-    line-height: 1.5em;
+    line-height: 1.8em;
 }
  
 div.admonition p.admonition-title + p {
@@ -182,22 +185,23 @@ div.highlight{
 }
 
 div.note {
-    background-color: #eee;
-    border: 1px solid #ccc;
+    background-color: #eeeeee;
+    border: 1px solid #cccccc;
 }
  
 div.seealso {
-    background-color: #ffc;
-    border: 1px solid #ff6;
+    background-color: #ffffcc;
+    border: 1px solid #ffff66;
 }
  
 div.topic {
-    background-color: #eee;
+    background-color: #fafafa;
+    border-width: 0;
 }
  
 div.warning {
     background-color: #ffe4e4;
-    border: 1px solid #f66;
+    border: 1px solid #ff6666;
 }
  
 p.admonition-title {
@@ -210,20 +214,23 @@ p.admonition-title:after {
  
 pre {
     padding: 10px;
-    background-color: White;
-    color: #222;
-    line-height: 1.2em;
-    border: 1px solid #C6C9CB;
-    font-size: 1.2em;
+    background-color: #fafafa;
+    color: #222222;
+    line-height: 1.5em;
+    font-size: 1.1em;
     margin: 1.5em 0 1.5em 0;
-    -webkit-box-shadow: 1px 1px 1px #d8d8d8;
-    -moz-box-shadow: 1px 1px 1px #d8d8d8;
+    -webkit-box-shadow: 0px 0px 4px #d8d8d8;
+    -moz-box-shadow: 0px 0px 4px #d8d8d8;
+    box-shadow: 0px 0px 4px #d8d8d8;
 }
  
 tt {
-    background-color: #ecf0f3;
-    color: #222;
+    color: #222222;
     padding: 1px 2px;
     font-size: 1.2em;
     font-family: monospace;
 }
+
+#table-of-contents ul {
+    padding-left: 2em;
+}
diff --git a/docs/api/backends.rst b/docs/api/backends.rst
new file mode 100644
index 00000000..d5077082
--- /dev/null
+++ b/docs/api/backends.rst
@@ -0,0 +1,298 @@
+*************************************
+:mod:`mopidy.backends` -- Backend API
+*************************************
+
+.. warning::
+    This is our *planned* backend API, and not the current API.
+
+.. module:: mopidy.backends
+    :synopsis: Interface between Mopidy and its various backends.
+
+.. class:: BaseBackend()
+
+    .. attribute:: current_playlist
+
+        The current playlist controller. An instance of
+        :class:`BaseCurrentPlaylistController`.
+
+    .. attribute:: library
+
+        The library controller. An instance of :class:`BaseLibraryController`.
+
+    .. attribute:: playback
+
+        The playback controller. An instance of :class:`BasePlaybackController`.
+
+    .. attribute:: stored_playlists
+
+        The stored playlists controller. An instance of
+        :class:`BaseStoredPlaylistsController`.
+
+    .. attribute:: uri_handlers
+
+        List of URI prefixes this backend can handle.
+
+
+.. class:: BaseCurrentPlaylistController(backend)
+
+    :param backend: backend the controller is a part of
+    :type backend: :class:`BaseBackend`
+
+    .. method:: add(track, at_position=None)
+
+        Add the track to the end of, or at the given position in the current
+        playlist.
+
+        :param track: track to add
+        :type track: :class:`mopidy.models.Track`
+        :param at_position: position in current playlist to add track
+        :type at_position: int or :class:`None`
+
+    .. method:: clear()
+
+        Clear the current playlist.
+
+    .. method:: load(playlist)
+
+        Replace the current playlist with the given playlist.
+
+        :param playlist: playlist to load
+        :type playlist: :class:`mopidy.models.Playlist`
+
+    .. method:: move(start, end, to_position)
+
+        Move the tracks at positions in [``start``, ``end``] to
+        ``to_position``.
+
+        :param start: position of first track to move
+        :type start: int
+        :param end: position of last track to move
+        :type end: int
+        :param to_position: new position for the tracks
+        :type to_position: int
+
+    .. attribute:: playlist
+
+        The currently loaded :class:`mopidy.models.Playlist`.
+
+    .. method:: remove(track)
+
+        Remove the track from the current playlist.
+
+        :param track: track to remove
+        :type track: :class:`mopidy.models.Track`
+
+    .. method:: shuffle(start=None, end=None)
+
+        Shuffles the playlist, optionally a part of the playlist given by
+        ``start`` and ``end``.
+
+        :param start: position of first track to shuffle
+        :type start: int or :class:`None`
+        :param end: position of last track to shuffle
+        :type end: int or :class:`None`
+
+    .. attribute:: version
+
+        The current playlist version. Integer which is increased every time the
+        current playlist is changed.
+
+
+.. class:: BasePlaybackController(backend)
+
+    :param backend: backend the controller is a part of
+    :type backend: :class:`BaseBackend`
+
+    .. attribute:: consume
+
+        :class:`True`
+            Tracks are removed from the playlist when they have been played.
+        :class:`False`
+            Tracks are not removed from the playlist.
+
+    .. attribute:: current_track
+
+        The currently playing or selected :class:`mopidy.models.Track`.
+
+    .. method:: next()
+
+        Play the next track.
+
+    .. method:: pause()
+
+        Pause playblack.
+
+    .. attribute:: PAUSED
+
+        Constant representing the paused state.
+
+    .. method:: play(id=None, position=None)
+
+        Play either the track with the given ID, the given position, or the
+        currently active track.
+
+        :param id: ID of track to play
+        :type id: int
+        :param position: position in current playlist of track to play
+        :type position: int
+
+    .. attribute:: PLAYING
+
+        Constant representing the playing state.
+
+    .. attribute:: playlist_position
+
+        The position in the current playlist.
+
+    .. method:: previous()
+
+        Play the previous track.
+
+    .. attribute:: random
+
+        :class:`True`
+            Tracks are selected at random from the playlist.
+        :class:`False`
+            Tracks are played in the order of the playlist.
+
+    .. attribute:: repeat
+
+        :class:`True`
+            The current track is played repeatedly.
+        :class:`False`
+            The current track is played once.
+
+    .. method:: resume()
+
+        If paused, resume playing the current track.
+
+    .. method:: seek(time_position)
+
+        Seeks to time position given in milliseconds.
+
+        :param time_position: time position in milliseconds
+        :type time_position: int
+
+    .. attribute:: state
+
+        The playback state. Must be :attr:`PLAYING`, :attr:`PAUSED`, or
+        :attr:`STOPPED`.
+
+    .. method:: stop()
+
+        Stop playing.
+
+    .. attribute:: STOPPED
+
+        Constant representing the stopped state.
+
+    .. attribute:: time_position
+
+        Time position in milliseconds.
+
+    .. attribute:: volume
+
+        The audio volume as an int in the range [0, 100]. :class:`None` if
+        unknown.
+
+
+.. class:: BaseLibraryController(backend)
+
+    :param backend: backend the controller is a part of
+    :type backend: :class:`BaseBackend`
+
+    .. method:: find_exact(type, query)
+
+        Find tracks in the library where ``type`` matches ``query`` exactly.
+
+        :param type: 'title', 'artist', or 'album'
+        :type type: string
+        :param query: the search query
+        :type query: string
+        :rtype: list of :class:`mopidy.models.Track`
+
+    .. method:: lookup(uri)
+
+        Lookup track with given URI.
+
+        :param uri: track URI
+        :type uri: string
+        :rtype: :class:`mopidy.models.Track`
+
+    .. method:: refresh(uri=None)
+
+        Refresh library. Limit to URI and below if an URI is given.
+
+        :param uri: directory or track URI
+        :type uri: string
+
+    .. method:: search(type, query)
+
+        Search the library for tracks where ``type`` contains ``query``.
+
+        :param type: 'title', 'artist', 'album', or 'uri'
+        :type type: string
+        :param query: the search query
+        :type query: string
+        :rtype: list of :class:`mopidy.models.Track`
+
+
+.. class:: BaseStoredPlaylistsController(backend)
+
+    :param backend: backend the controller is a part of
+    :type backend: :class:`BaseBackend`
+
+    .. method:: add(uri)
+
+        Add existing playlist with the given URI.
+
+        :param uri: URI of existing playlist
+        :type uri: string
+
+    .. method:: create(name)
+
+        Create a new playlist.
+
+        :param name: name of the new playlist
+        :type name: string
+        :rtype: :class:`mopidy.models.Playlist`
+
+    .. attribute:: playlists
+
+        List of :class:`mopidy.models.Playlist`.
+
+    .. method:: delete(playlist)
+
+        Delete playlist.
+
+        :param playlist: the playlist to delete
+        :type playlist: :class:`mopidy.models.Playlist`
+
+    .. method:: lookup(uri)
+
+        Lookup playlist with given URI.
+
+        :param uri: playlist URI
+        :type uri: string
+        :rtype: :class:`mopidy.models.Playlist`
+
+    .. method:: refresh()
+
+        Refresh stored playlists.
+
+    .. method:: rename(playlist, new_name)
+
+        Rename playlist.
+
+        :param playlist: the playlist
+        :type playlist: :class:`mopidy.models.Playlist`
+        :param new_name: the new name
+        :type new_name: string
+
+    .. method:: search(query)
+
+        Search for playlists whose name contains ``query``.
+
+        :param query: query to search for
+        :type query: string
+        :rtype: list of :class:`mopidy.models.Playlist`
diff --git a/docs/api/models.rst b/docs/api/models.rst
new file mode 100644
index 00000000..75f9ab02
--- /dev/null
+++ b/docs/api/models.rst
@@ -0,0 +1,8 @@
+*********************************************
+:mod:`mopidy.models` -- Immutable data models
+*********************************************
+
+.. automodule:: mopidy.models
+    :synopsis: Immutable data models.
+    :members:
+    :undoc-members:
diff --git a/docs/conf.py b/docs/conf.py
index f0d29003..8cb63290 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -16,13 +16,13 @@ import sys, os
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
-#sys.path.append(os.path.abspath('.'))
+sys.path.append(os.path.abspath(os.path.dirname(__file__) + '/../'))
 
 # -- General configuration -----------------------------------------------------
 
 # Add any Sphinx extension module names here, as strings. They can be extensions
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
-extensions = []
+extensions = ['sphinx.ext.autodoc']
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
@@ -147,7 +147,7 @@ html_static_path = ['_static']
 #html_split_index = False
 
 # If true, links to the reST sources are added to the pages.
-#html_show_sourcelink = True
+html_show_sourcelink = False
 
 # If true, an OpenSearch description file will be output, and all pages will
 # contain a <link> tag referring to it.  The value of this option must be the
diff --git a/docs/development.rst b/docs/development.rst
index 68239393..959dcd58 100644
--- a/docs/development.rst
+++ b/docs/development.rst
@@ -6,6 +6,15 @@ Development of Mopidy is coordinated through the IRC channel ``#mopidy`` at
 ``irc.freenode.net`` and through `GitHub <http://github.com/>`_.
 
 
+API documentation
+=================
+
+.. toctree::
+    :glob:
+
+    api/*
+
+
 Scope
 =====
 
diff --git a/docs/index.rst b/docs/index.rst
index 08a9dacd..7c618dc3 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -14,5 +14,6 @@ Indices and tables
 ==================
 
 * :ref:`genindex`
+* :ref:`modindex`
 * :ref:`search`
 
diff --git a/mopidy/backends/__init__.py b/mopidy/backends/__init__.py
index 0d68c68d..43fbbd5d 100644
--- a/mopidy/backends/__init__.py
+++ b/mopidy/backends/__init__.py
@@ -123,10 +123,6 @@ class BaseBackend(object):
         return self.state
 
     def status_time(self):
-        # XXX This is only called when a client is connected, and is thus not a
-        # complete solution
-        if self._play_time_elapsed >= self.status_time_total() > 0:
-            self.end_of_track()
         return u'%s:%s' % (self._play_time_elapsed, self.status_time_total())
 
     def status_time_total(self):
@@ -208,13 +204,13 @@ class BaseBackend(object):
 
 # Current/single playlist methods
 
-    def playlist_changes_since(self, version):
-        return None
-
     def playlist_load(self, name):
+        self._current_song_pos = None
         matches = filter(lambda p: p.name == name, self._playlists)
         if matches:
             self._current_playlist = matches[0]
+            if self.state == self.PLAY:
+                self.play(songpos=0)
         else:
             self._current_playlist = None
 
diff --git a/mopidy/backends/despotify.py b/mopidy/backends/despotify.py
index 646228c8..a60e2aac 100644
--- a/mopidy/backends/despotify.py
+++ b/mopidy/backends/despotify.py
@@ -120,4 +120,5 @@ class DespotifyBackend(BaseBackend):
     def search(self, type, what):
         query = u'%s:%s' % (type, what)
         result = self.spotify.search(query.encode(ENCODING))
-        return self._to_mopidy_playlist(result.playlist).mpd_format()
+        if result is not None:
+            return self._to_mopidy_playlist(result.playlist).mpd_format()
diff --git a/mopidy/models.py b/mopidy/models.py
index bd47c1ef..39212c8e 100644
--- a/mopidy/models.py
+++ b/mopidy/models.py
@@ -1,20 +1,40 @@
 from copy import copy
 
 class Artist(object):
+    """
+    :param uri: artist URI
+    :type uri: string
+    :param name: artist name
+    :type name: string
+    """
+
     def __init__(self, uri=None, name=None):
         self._uri = None
         self._name = name
 
     @property
     def uri(self):
+        """The artist URI. Read-only."""
         return self._uri
 
     @property
     def name(self):
+        """The artist name. Read-only."""
         return self._name
 
 
 class Album(object):
+    """
+    :param uri: album URI
+    :type uri: string
+    :param name: album name
+    :type name: string
+    :param artists: album artists
+    :type artists: list of :class:`Artist`
+    :param num_tracks: number of tracks in album
+    :type num_tracks: integer
+    """
+
     def __init__(self, uri=None, name=None, artists=None, num_tracks=0):
         self._uri = uri
         self._name = name
@@ -23,24 +43,49 @@ class Album(object):
 
     @property
     def uri(self):
+        """The album URI. Read-only."""
         return self._uri
 
     @property
     def name(self):
+        """The album name. Read-only."""
         return self._name
 
     @property
     def artists(self):
+        """List of :class:`Artist` elements. Read-only."""
         return copy(self._artists)
 
     @property
     def num_tracks(self):
+        """The number of tracks in the album. Read-only."""
         return self._num_tracks
 
 
 class Track(object):
+    """
+    :param uri: track URI
+    :type uri: string
+    :param title: track title
+    :type title: string
+    :param artists: track artists
+    :type artists: list of :class:`Artist`
+    :param album: track album
+    :type album: :class:`Album`
+    :param track_no: track number in album
+    :type track_no: integer
+    :param date: track release date
+    :type date: :class:`datetime.date`
+    :param length: track length in milliseconds
+    :type length: integer
+    :param bitrate: bitrate in kbit/s
+    :type bitrate: integer
+    :param id: track ID (unique and non-changing as long as the process lives)
+    :type id: integer
+    """
+
     def __init__(self, uri=None, title=None, artists=None, album=None,
-            track_no=0, date=None, length=None, id=None):
+            track_no=0, date=None, length=None, bitrate=None, id=None):
         self._uri = uri
         self._title = title
         self._artists = artists or []
@@ -48,41 +93,62 @@ class Track(object):
         self._track_no = track_no
         self._date = date
         self._length = length
+        self._bitrate = bitrate
         self._id = id
 
     @property
     def uri(self):
+        """The track URI. Read-only."""
         return self._uri
 
     @property
     def title(self):
+        """The track title. Read-only."""
         return self._title
 
     @property
     def artists(self):
+        """List of :class:`Artist`. Read-only."""
         return copy(self._artists)
 
     @property
     def album(self):
+        """The track :class:`Album`. Read-only."""
         return self._album
 
     @property
     def track_no(self):
+        """The track number in album. Read-only."""
         return self._track_no
 
     @property
     def date(self):
+        """The track release date. Read-only."""
         return self._date
 
     @property
     def length(self):
+        """The track length in milliseconds. Read-only."""
         return self._length
 
+    @property
+    def bitrate(self):
+        """The track's bitrate in kbit/s. Read-only."""
+        return self._bitrate
+
     @property
     def id(self):
+        """The track ID. Read-only."""
         return self._id
 
     def mpd_format(self, position=0):
+        """
+        Format track for output to MPD client.
+
+        :param position: track's position in playlist
+        :type position: integer
+        :rtype: list of two-tuples
+        """
         return [
             ('file', self.uri),
             ('Time', self.length // 1000),
@@ -96,10 +162,24 @@ class Track(object):
         ]
 
     def mpd_format_artists(self):
+        """
+        Format track artists for output to MPD client.
+
+        :rtype: string
+        """
         return u', '.join([a.name for a in self.artists])
 
 
 class Playlist(object):
+    """
+        :param uri: playlist URI
+        :type uri: string
+        :param name: playlist name
+        :type name: string
+        :param tracks: playlist's tracks
+        :type tracks: list of :class:`Track` elements
+    """
+
     def __init__(self, uri=None, name=None, tracks=None):
         self._uri = uri
         self._name = name
@@ -107,21 +187,30 @@ class Playlist(object):
 
     @property
     def uri(self):
+        """The playlist URI. Read-only."""
         return self._uri
 
     @property
     def name(self):
+        """The playlist name. Read-only."""
         return self._name
 
     @property
     def tracks(self):
+        """List of :class:`Track` elements. Read-only."""
         return copy(self._tracks)
 
     @property
     def length(self):
+        """The number of tracks in the playlist. Read-only."""
         return len(self._tracks)
 
     def mpd_format(self, start=0, end=None):
+        """
+        Format playlist for output to MPD client.
+
+        :rtype: list of lists of two-tuples
+        """
         if end is None:
             end = self.length
         tracks = []
diff --git a/tests/backends/__init__.py b/tests/backends/__init__.py
new file mode 100644
index 00000000..cec58c73
--- /dev/null
+++ b/tests/backends/__init__.py
@@ -0,0 +1,48 @@
+from mopidy.models import Track
+
+class BaseCurrentPlaylistControllerTest(object):
+    uris = []
+    backend_class = None
+
+    def setUp(self):
+        self.backend = self.backend_class()
+
+    def test_add(self):
+        playlist = self.backend.current_playlist
+
+        for uri in self.uris:
+            playlist.add(uri)
+            self.assertEqual(uri, playlist.tracks[-1].uri)
+
+    def test_add_at_position(self):
+        playlist = self.backend.current_playlist
+
+        for uri in self.uris:
+            playlist.add(uri, 0)
+            self.assertEqual(uri, playlist.tracks[0].uri)
+
+        # FIXME test other placements
+
+class BasePlaybackControllerTest(object):
+    backend_class = None
+
+    def setUp(self):
+        self.backend = self.backend_class()
+
+    def test_play(self):
+        playback = self.backend.playback
+
+        self.assertEqual(playback.state, playback.STOPPED)
+
+        playback.play()
+
+        self.assertEqual(playback.state, playback.PLAYING)
+
+    def test_next(self):
+        playback = self.backend.playback
+
+        current_song = playback.playlist_position
+
+        playback.next()
+
+        self.assertEqual(playback.playlist_position, current_song+1)