title: Delete test log file failed in unit test
body: <p>During a unit-test, I try to delete a log file which raises the error below</p>
  
  <pre><code>ErrorException: unlink(/storage/framework/testing/xxxxxxxxxx.log): Text file busy
  </code></pre>
  
  <p>I have been researching for hours, I could really use some help. Thanks in advance.</p>