title: Run multiple phpunit.xml files?
body: <p>I have a project that is broken down into the following:</p>
  
  <pre><code>ProjectName/
    ModuleOne/
    ModuleTwo/
  </code></pre>
  
  <p>each module has a phpunit.xml and a test directory. Each module also has their own <code>composer.json</code> and so on and so forth, allowing me to easily package this as one library or allow you to get specific modules based on your needs.</p>
  
  <p>The issue I have is that since each module has its own test folder with a phpunit.xml file, I need to create another phpunit.xml at the root of the project that runs each modules tests. I thought I could do this via:</p>
  
  <pre><code>&lt;testsuites&gt;
    &lt;testsuite name="ModuleOne"&gt;
      &lt;directory&gt;ModuleOne/tests/&lt;/directory&gt;
    &lt;/testsuite&gt;
    &lt;testsuite name="Moduletwo"&gt;
      &lt;directory&gt;Moduletwo/tests/&lt;/directory&gt;
    &lt;/testsuite&gt;
  &lt;/testsuites&gt;
  </code></pre>
  
  <p>But when I run phpunit from the root directory I get a message saying no tests were run. Why? I specified the test suite name and the directory of where the tests live...</p>
  
  <p>Is there something I am missing?</p>