```ruby
require 'spec_helper'

describe AppDecorator do
  before { ApplicationController.new.set_current_view_context }

  describe '#participating_brigade_links' do

    it 'should return a url formatted string containging brigade names and their links when the application has deployed apps' do
      application = FactoryGirl.build(:application)
      first_brigade = FactoryGirl.build(:brigade)
      second_brigade = FactoryGirl.build(:brigade)

      application.stub(:participating_brigades).and_return([first_brigade, second_brigade])
      subject = AppDecorator.new(application)
      subject.participating_brigade_links.should match /#{first_brigade.name}/ #, second_brigade.name]
    end

    it 'should return an empty string when the application does not have deployed apps' do
      application = FactoryGirl.build(:application)
      subject = AppDecorator.new(application)
      subject.participating_brigade_links.should == ''
    end
  end
end
```

Add more test coverage for app decorator's picture_gallary method
user
```ruby
require 'spec_helper'

describe AppDecorator do
  before { ApplicationController.new.set_current_view_context }

  describe '#participating_brigade_links' do

    it 'should return a url formatted string containging brigade names and their links when the application has deployed apps' do
      application = FactoryGirl.build(:application)
      first_brigade = FactoryGirl.build(:brigade)
      second_brigade = FactoryGirl.build(:brigade)

      application.stub(:participating_brigades).and_return([first_brigade, second_brigade])
      subject = AppDecorator.new(application)
      subject.participating_brigade_links.should match /#{first_brigade.name}/ #, second_brigade.name]
    end

    it 'should return an empty string when the application does not have deployed apps' do
      application = FactoryGirl.build(:application)
      subject = AppDecorator.new(application)
      subject.participating_brigade_links.should == ''
    end
  end

  describe '#picture_gallary' do

    it 'returns nil when there are no pictures' do
      application = AppDecorator.new(FactoryGirl.build(:application))
      application.picture_gallary.should be_nil
    end

    it 'returns raw html for a picture gallary when there is more than one picture' do
      VCR.use_cassette(:s3_file_save) { @app_with_pics = FactoryGirl.create(:application_with_four_pictures) }
      application_with_pictures = AppDecorator.new(@app_with_pics)
      application_with_pictures.picture_gallary.should match /ul class="thumbnails"/
    end
  end
end
```
assistant