makes specs for error handling more robust

spec/features/verification/sms_spec.rb

@@ -28,7 +28,7 @@ feature 'SMS Verification' do
 
     click_button 'Send'
 
-    expect(page).to have_content error_message
+    expect(page).to have_content error_message("phone")
   end
 
   scenario 'Errors on verification code' do

spec/support/common_actions.rb

@@ -108,8 +108,9 @@ module CommonActions
     SCRIPT
   end
 
-  def error_message
-    /\d errors? prevented this (.*) from being saved:/
+  def error_message(resource_model=nil)
+    resource_model ||= "(.*)"
+    /\d errors? prevented this #{resource_model} from being saved:/
   end
 
   def expect_to_be_signed_in