[TESTS] Add support for loading test suites from plugins and components

phpunit.xml.dist

@@ -51,6 +51,12 @@
     <testsuite name="Util">
       <directory suffix="Test.php">./tests/Util</directory>
     </testsuite>
+    <testsuite name="Plugins">
+      <directory suffix="Test.php">./plugins/</directory>
+    </testsuite>
+    <testsuite name="Component">
+      <directory suffix="Test.php">./components/</directory>
+    </testsuite>
   </testsuites>
   <listeners>
     <listener class="Symfony\Bridge\PhpUnit\SymfonyTestsListener"/>