title: how can i test word cloud system?
body: <p>i need help about testing a word cloud system.</p>
  
  <p><strong>The system:</strong> the system has 3 word clouds visualization (A, B and C). The word cloud A and B are the output of the dataset A and dataset B, respectively. The word cloud C is the operation result between word cloud A and B. </p>
  
  <p><strong>The question:</strong> how can i test that scenario? Anyone can give me some example of test cases  and test method to that system. How can i ensure that system is working correctly?  </p>