fix channel JSON response

spec/controllers/channels_controller_spec.rb

@@ -33,6 +33,7 @@ describe ChannelsController do
       @channel.name.should eq('new name')
       response.should redirect_to channel_path(@channel.id)
     end
+
     it "should allow a channel to be deleted " do
       delete :destroy, :id => @channel.id
       response.should redirect_to channels_path
@@ -134,6 +135,18 @@ describe ChannelsController do
       end
     end
 
+    describe "show channel" do
+      it 'shows a channel' do
+        get :show, id: @channel.id
+        response.should be_successful
+      end
+      it 'returns JSON' do
+        get :show, id: @channel.id, format: 'json'
+        JSON.parse(response.body)['name'].should eq(@channel.name)
+        JSON.parse(response.body)['tags'].should eq([])
+      end
+    end
+
     describe "create channel" do
       it 'creates a channel' do
         post :create, {:key => @user.api_key, :name => 'mychannel'}