```ruby
require 'abstract_unit'

class EngineTest < ActiveSupport::TestCase
  it "reports routes as available only if they're actually present" do
    engine = Class.new(Rails::Engine) do
      def initialize(*args)
        @routes = nil
        super
      end
    end

    assert !engine.routes?
  end

  it "does not add more paths to routes on each call" do
    engine = Class.new(Rails::Engine)

    engine.routes
    length = engine.routes.draw_paths.length

    engine.routes
    assert_equal length, engine.routes.draw_paths.length
  end
end
```

Remove another missing test related to draw external routes
user
```ruby
require 'abstract_unit'

class EngineTest < ActiveSupport::TestCase
  it "reports routes as available only if they're actually present" do
    engine = Class.new(Rails::Engine) do
      def initialize(*args)
        @routes = nil
        super
      end
    end

    assert !engine.routes?
  end
end
```
assistant