add test for unified id/class selector

Author: Rct567

tests/Rct567/DomQuery/Tests/DomQuerySelectorsTest.php

@@ -19,6 +19,7 @@ public function testCssToXpath()
             '#someid' => '//*[@id=\'someid\']',
             'p#someid' => '//p[@id=\'someid\']',
             '#some\\.id' => '//*[@id=\'some.id\']',
+            '#someid.some-class' => '//*[@id=\'someid\'][contains(concat(\' \', normalize-space(@class), \' \'), \' some-class \')]',
             '#id[_]' => '//*[@id=\'id\'][@_]',
             'p a' => '//p//a',
             'div, span' => '//div|//span',