title: What does "shadows it in the MATLAB path" mean? How to do it in a file?
body: <p><img src="https://i.stack.imgur.com/9bAUE.png" alt="enter image description here"></p>
  
  <p>I need to do this always before running unitTester file. I cannot understand why this is required. What does this mean? And why is the <code>"Add to Path &gt; Selected Folders and Subfolders"</code> not enough?</p>
  
  <p><strong>[Update]</strong> <em>This <a href="https://i.stack.imgur.com/VKPjM.png" rel="noreferrer">here</a> may be the problem. The kernel is programmed in different techniques where the file names are the same. I need to make sure only certain files are used in each case. Is the easiest way use here a package not to mess up namespaces?</em></p>