```ruby
require 'spec_helper'

describe "Navigation" do
  include Capybara
  
  it "should be a valid app" do
    ::Rails.application.should be_a(Dummy::Application)
  end
end
```

Include Capybara::DSL instead of deprecated Capybara.
user
```ruby
require 'spec_helper'

describe "Navigation" do
  include Capybara::DSL
  
  it "should be a valid app" do
    ::Rails.application.should be_a(Dummy::Application)
  end
end
```
assistant