title: How to lookup / check a dictionary value by key
body: <p>I am trying to confirm whether a specific dictionary key contains a value</p>
  
  <p>e.g.</p>
  
  <p>does dict01 contain the phrase "testing" in the "tester" key</p>
  
  <p>At the moment I am having to iterate through the dictionary using KeyPair, which I don't want to have to do as it wasting performance </p>