PHPUnit_Framework_Assert::assertAttributeInstanceOf PHP Method

    public static function assertAttributeInstanceOf($expected, $attributeName, $classOrObject, $message = '')
    {
        static::assertInstanceOf($expected, static::readAttribute($classOrObject, $attributeName), $message);
    }

 /**
  * Test the semantic() function
  *
  * @expectedException ErrorException
  *
  * @return  void
  */
 public function testSemantic()
 {
     $this->handler = new ParserPlugin('doesNotExist');
     $this->handler = new ParserPlugin('Microdata');
     PHPUnit_Framework_Assert::assertAttributeInstanceOf('PHPMicrodata', 'handler', $this->handler);
     $this->handler = new ParserPlugin('RDFa');
     PHPUnit_Framework_Assert::assertAttributeInstanceOf('PHPRDFa', 'handler', $this->handler);
 }