title: how to put assertions in ruby code
body: <p>I want to use the assertions and put valuidations in my ruby code (e.g: checking if a zip file is created, label is present, message in the text area, etc). I have put a few assert statements like <code>assert @selenium.is_text_present(textMessage)</code>, but they don't work. </p>
  
  <p>Please let me know if any ruby gem for assertions is to be installed.</p>