[padrino-gen] should create spec/app/spec_helper for sub-apps

[postmodern]

When one generates a sub-app, a special test_helper.rb /spec_helperfile should be created which overrides theapp` method used by RackTest.

require 'spec_helper'

def app
  ##
  # You can handle all padrino applications using instead:
  #   Padrino.application
  API.tap { |app|  }
end

[achiurizo]

Hm that's an interesting idea. Though this would lead to alot of helpers eventually no?
I've been getting around this by doing something like https://github.com/padrino/padrino-framework/blob/master/padrino-gen/lib/padrino-gen/generators/components/tests/riot.rb#L31.
This allows me to specify in my test something like:

describe "MyController" do
  before do
    app MySubApp.tap { |a| }
  end
  # ...
end

Does this seem like a good solution? If so I can push this to the other generated test/spec helpers.