/**
  * testMagicSleepReturnsExpectedSetOfPropertyNames
  *
  * @return void
  */
 public function testMagicSleepReturnsExpectedSetOfPropertyNames()
 {
     $expr = new PHP_Depend_Code_ASTRequireExpression();
     self::assertEquals(array('once', 'comment', 'metadata', 'nodes'), $expr->__sleep());
 }