require 'spec_helper'

describe PlaylistsController do
  def valid_attributes
    {
      :name => 'Electro'
    }
  end

  describe "GET index" do
    it 'assigns all playlists as @playlists' do
      playlist = Playlist.create! valid_attributes
      get :index
      assigns[:playlists].should == [playlist]
    end
  end

  describe "GET new" do
    it 'assigns a new playlist as @playlist' do
      get :new
      assigns[:playlist].should be_a_new(Playlist)
    end
  end

  describe "POST create" do
    let(:playlist) { mock_model(Playlist).as_null_object }

    before do
      Playlist.stub(:new).and_return(playlist)
    end

    it 'creates a new playlist' do
      Playlist.should_receive(:new).
        with('name' => 'Electro').
        and_return(playlist)
      post :create, :playlist => { 'name' => 'Electro' }
    end

    it 'saves the playlist' do
      playlist.should_receive(:save)
      post :create
    end

    context 'when the playlist saves successfully' do
      it 'redirects to the playlists index' do
        post :create
        response.should redirect_to(:action => 'index')
      end
    end

    context 'when the playlist fails to save' do
      before do
        playlist.stub(:save).and_return(false)
      end

      it 'assigns the playlist as @playlist' do
        post :create
        assigns[:playlist].should eq(playlist)
      end

      it 'renders the new template' do
        post :create
        response.should render_template('new')
      end
    end
  end
end