Fix implementation of playing? method and test it

lib/mpd_client/song.rb

@@ -12,7 +12,9 @@ module MPDClient
     end
 
     def playing?
-      self == self.class.current_song
+      if current = self.class.current_song
+        [artist, album, title]  == [current.artist, current.album, current.title]
+      end
     end
 
     def length
@@ -20,7 +22,7 @@ module MPDClient
     end
 
     def <=>(other)
-      [artist, album, title]  == [other.artist, other.album, other.title]
+      [artist, album, title] <=> [other.artist, other.album, other.title]
     end
 
     def to_h
@@ -51,7 +53,9 @@ module MPDClient
       end
 
       def current_song
-        new(MPDClient.conn.current_song)
+        if song = MPDClient.conn.current_song
+          new(song)
+        end
       end
     end
 

spec/lib/mpd_client/song_spec.rb

@@ -11,8 +11,27 @@ describe MPDClient::Song do
     MPDClient.conn.stub(:queue).and_return([song1, song2])
   end
 
-  it 'returns the queue of songs' do
-    queue = subject.queue
-    expect(queue).to have(2).items
+  describe "#queue" do
+    it "returns the list of songs" do
+      queue = subject.queue
+      expect(queue).to have(2).items
+    end
+  end
+
+  describe "#playing?" do
+    let(:playing_song) { subject.new(song1) }
+    let(:not_playing_song) { subject.new(song2) }
+
+    before do
+      MPDClient.conn.stub(:current_song).and_return(song1)
+    end
+
+    it "should be true when the song is playing" do
+      playing_song.playing?.should eq(true)
+    end
+
+    it "should be false when the song is not playing" do
+      not_playing_song.playing?.should eq(false)
+    end
   end
 end