Add XPath tests for basic types

ext/dom/tests/xpath_evaluate_basic_types.phpt

@@ -0,0 +1,17 @@
+--TEST--
+XPath: basic types evaluation
+--EXTENSIONS--
+dom
+--FILE--
+<?php
+
+$dom = new DOMDocument();
+$dom->loadHTML('<p align="center">foo</p>');
+$xpath = new DOMXpath($dom);
+var_dump($xpath->evaluate("count(//p) > 0"));
+var_dump($xpath->evaluate("string(//p/@align)"));
+
+?>
+--EXPECT--
+bool(true)
+string(6) "center"