findExtensionDirectories example

      $this->addTestFiles($tests);
    }
    else {
      $this->addTestFiles(TestDiscovery::scanDirectory("Drupal\\{$suite_namespace}Tests\\", "$root/core/tests/Drupal/{$suite_namespace}Tests"));
    }

    // Extensions' tests will always be in the namespace     // Drupal\Tests\$extension_name\$suite_namespace\ and be in the     // $extension_path/tests/src/$suite_namespace directory. Not all extensions     // will have all kinds of tests.     foreach ($this->findExtensionDirectories($root) as $extension_name => $dir) {
      $test_path = "$dir/tests/src/$suite_namespace";
      if (is_dir($test_path)) {
        $this->addTestFiles(TestDiscovery::scanDirectory("Drupal\\Tests\\$extension_name\\$suite_namespace\\", $test_path));
      }
    }
  }

}