Remove controllers spec already tested elsewhere

spec/integration/api/tracks_spec.rb

@@ -4,21 +4,20 @@ describe 'API tracks' do
   before { api_sign_in }
 
   it 'lists tracks' do
-    track_1 = FactoryGirl.create(:track_with_sound, name: 'Track 1')
-    track_2 = FactoryGirl.create(:track, name: 'Track 2')
-
+    track_1 = create :track_with_sound, name: 'Track 1'
+    track_2 = create :track, name: 'Track 2'
     get api_tracks_path, format: :json
 
-    expect(response.body).to eq [
+    expect(json).to eq [
       {
-        id: track_1.id,
-        name: 'Track 1',
-        sound_url: api_sound_url(track_1.sound)
+        id:         track_1.id,
+        name:       'Track 1',
+        sound_url:  api_sound_url(track_1.sound)
       },
       {
-        id: track_2.id,
-        name: 'Track 2'
+        id:         track_2.id,
+        name:       'Track 2'
       }
-    ].to_json
+    ]
   end
 end