Platform-specific PHPUnit/Selenium test case architecture

ModuleTest.php

<?php

/* /test/module/ModuleTest.php */

class ModuleTest extends PlatformSpecificTestCase {
  public function setUp() {
    $this->login();
  }

  // test stuff
}

PlatformSpecificAdminTrait.php

<?php

/* /test/shared/PlatformSpecificAdminTrait.php */

trait PlatformSpecificAdminTrait {
  protected function login() {
    // do stuff
  }
  
  protected function logout() {
    // do more stuff
  }
}

PlatformSpecificTestCase.php

<?php

/* /test/shared/PlatformSpecificTestCase.php */

class PlatformSpecificTestCase extends PHPUnit_Extensions_Selenium2TestCase {
  use PlatformSpecificAdminTrait;
  // ^ pull in any other useful traits like this...
}