fixes #438 - getElementAttribute to works with XPath

@@ -892,7 +892,7 @@ Casper.prototype.getElementAttr = function getElementAttr(selector, attribute) {
     "use strict";
     this.checkStarted();
     return this.evaluate(function _evaluate(selector, attribute) {
-        return document.querySelector(selector).getAttribute(attribute);
+        return __utils__.findOne(selector).getAttribute(attribute);
     }, selector, attribute);
 };
 

 /*global casper*/
 /*jshint strict:false*/
-casper.test.begin('getElementAttribute() tests', 1, function(test) {
+var x = require('casper').selectXPath;
+
+casper.test.begin('getElementAttribute() tests', 2, function(test) {
     casper.start('tests/site/elementattribute.html', function() {
-        test.assertEquals(this.getElementAttribute('.testo','data-stuff'), 'beautiful string',
-            'Casper.getElementAttribute() works as intended');
+        test.assertEquals(this.getElementAttribute('.testo', 'data-stuff'),
+            'beautiful string', 'Casper.getElementAttribute() works with a CSS selector');
+        test.assertEquals(this.getElementAttribute(x('//div[@class]'), 'data-stuff'),
+            'beautiful string', 'Casper.getElementAttribute() works with a XPath selector');
     }).run(function() {
         test.done();
     });