title: phpunit xml sequential testing issue
body: <p>I'm Having an issue when running a testsuite, I need to run OperatorUserTest.php first to setup the users permissions, Im hoping I can do something like this </p>
  
  <pre><code> &lt;testsuite name="Operator Test Suite"&gt;
          &lt;file&gt;./tests/Users/OperatorUserTest.php&lt;/file&gt;
          &lt;directory&gt;./tests/Projects&lt;/directory&gt;
          &lt;directory&gt;./tests/Operators/UnitTesting&lt;/directory&gt;
  
      &lt;/testsuite&gt;
  </code></pre>
  
  <p>but the above errors as for some reason the file does not fully run and the operators/UnitTesting directory is called before it finishes. The code below works fine.</p>
  
  <pre><code>  &lt;testsuite name="Operator Test Suite"&gt;
          &lt;directory&gt;./tests/Users&lt;/directory&gt;
          &lt;exclude&gt;
              &lt;file&gt;./tests/Users/UserTest.php&lt;/file&gt;
          &lt;/exclude&gt;
          &lt;directory&gt;./tests/Projects&lt;/directory&gt;
          &lt;directory&gt;./tests/Operators/UnitTesting&lt;/directory&gt;
  
      &lt;/testsuite&gt;
  </code></pre>
  
  <p>Am I doing something wrong with using the file first? Thanks</p>