title: Multiple when/then with where for each other
body: <p>I'm trying to write functional test with <strong>Spock</strong> and <strong>Geb</strong>. 
  I want to use in one test method <strong>multiple blocks of when/then</strong> with <strong>where</strong> for each block. Is it possible? Or I should use one where for all the when/then?</p>