title: Get random values from an array
body: <p>I defined a new variable </p>
  
  <pre><code>Name        Value            Description
  categories  (1, 2, 3, 4, 5)  my categories ids
  </code></pre>
  
  <p>and in my path i want to get a random value from categories: <code>category_id=my_random_value</code>.</p>
  
  <p>I even tried this </p>
  
  <pre><code>category_id=${__StringFromArrayAtRandomindex('1', '2', '3', '4', '5'}
  </code></pre>
  
  <p>but it doesn't work.</p>