features: move feature matchers to their own file

This allows to have the same syntax than native Capybara matchers.

spec/support/feature_helpers.rb

@@ -55,14 +55,6 @@ module FeatureHelpers
     visit "/users/confirmation?#{token_params}"
   end
 
-  def expect_page_to_have_procedure_description(procedure)
-    # Procedure context on the page
-    expect(page).to have_content(procedure.libelle)
-    expect(page).to have_content(procedure.description)
-    # Procedure contact infos in the footer
-    expect(page).to have_content(procedure.service.email)
-  end
-
   def click_reset_password_link_for(email)
     reset_password_email = open_email(email)
     token_params = reset_password_email.body.match(/reset_password_token=[^"]+/)

spec/support/feature_matchers.rb

@@ -0,0 +1,9 @@
+module Capybara
+  class Session
+    # Find the description of a procedure on the page
+    # Usage: expect(page).to have_procedure_description(procedure)
+    def has_procedure_description?(procedure)
+      has_content?(procedure.libelle) && has_content?(procedure.description) && has_content?(procedure.service.email)
+    end
+  end
+end