Where does Rails use REXML lib and how to require that part?

Question

I have a gem that uses some of the Rails libs, including action_view and active_controller. Though I require those libs, all tests fail when trying to call some has_text? method, which (as I found out) is part of'rexml/element' lib. Here's what I get:

undefined method `has_text?' for "<b>Hello,<i>world</b></i>":String

Requiring 'rexml/element' does not solve the issue, got the same error. So, the question is - what should I require?

Answer 1

Please post the full exception backtrace so that we can read the stack and find the method that calls has_text?