title: How to Unit Test a method that has fileName as a Parameter
body: <p>I have the following method:</p>
  
  <pre><code>public static IEnumerable&lt;Customer&gt; GetStuff(string fileName,int filterValue)
  </code></pre>
  
  <p>How would you unit test this? Obviously, my problem is with the <code>fileName</code> parameter.</p>
  
  <p>Thank you!</p>