Inject login helper for Integration Tests

[bousquet]

Something like this needs to be added and auto-injected into the test suite:

class MiniTest::Rails::ActionDispatch::IntegrationTest

  # Public: Login helper for the thincloud-auth forms using Capybara.
  #
  # identity - Thincloud::Authentication identity object
  #
  # Returns the Capybara session after clicking the login button.
  def login(identity=nil)
    identity ||= create(:identity)

    visit login_path

    within("#login form:first-child") do
      fill_in "auth_key", with: identity.email
      fill_in "password", with: identity.password

      click_button "Login"
    end

    identity
  end

end