add optional test url

app/views/authenticated_app/passwords/_password_tips.html.haml

@@ -12,3 +12,7 @@
     .col
       %b Suggestion:
       %span= @zxcvbn_suggestion
+- if AuthenticatedApp.config.password_test_url.present?
+  .row
+    .col
+      %p= link_to('Click here', AuthenticatedApp.config.password_test_url) + tag.span(' to test out your password.')

lib/authenticated_app/configuration.rb

@@ -49,6 +49,9 @@ module AuthenticatedApp
 
     attr_accessor :forbidden_regexps # used internally
 
+    # If provided, this link is listed on the password tips page
+    attr_accessor :password_test_url
+
     def initialize
       @mode = :default