PHPUnit_Framework_Assert::assertXmlStringEqualsXmlString PHP Method

    public static function assertXmlStringEqualsXmlString($expectedXml, $actualXml, $message = '')
    {
        $expected = PHPUnit_Util_XML::load($expectedXml);
        $actual = PHPUnit_Util_XML::load($actualXml);
        static::assertEquals($expected, $actual, $message);
    }

 public static function assertEquals(TestRequestResponse $expected, TestRequestResponse $actual, $message = false)
 {
     $expectedText = $expected->getResponseText();
     $actualText = $actual->getResponseText();
     if ($expected->requestUrl['format'] == 'xml') {
         Asserts::assertXmlStringEqualsXmlString($expectedText, $actualText, $message);
     } else {
         Asserts::assertEquals(strlen($expectedText), strlen($actualText), $message);
         Asserts::assertEquals($expectedText, $actualText, $message);
     }
 }