PHPUnit_Framework_Assert::assertXmlStringNotEqualsXmlString PHP Method

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

/**
 * Asserts that two XML documents are not equal.
 *
 * @param  string $expectedXml
 * @param  string $actualXml
 * @param  string $message
 * @since  Method available since Release 3.1.0
 */
function assertXmlStringNotEqualsXmlString($expectedXml, $actualXml, $message = '')
{
    return PHPUnit_Framework_Assert::assertXmlStringNotEqualsXmlString($expectedXml, $actualXml, $message);
}