test that opensearch link is the main page HTML head

tests/Api/OpenSearchTest.php

@@ -0,0 +1,52 @@
+<?php
+
+
+class Api_OpenSearchTest extends TestBaseApi
+{
+    protected $urlPart = '';
+
+
+
+    public function testOpenSearchAvailable()
+    {
+        $req  = $this->getRequest();
+        $xhtml = $req->send()->getBody();
+
+        $xml = simplexml_load_string($xhtml);
+        $xml->registerXPathNamespace('h', reset($xml->getDocNamespaces()));
+
+        $this->assertInstanceOf(
+            'SimpleXMLElement', $xml,
+            'SemanticScuttle main page XHTML could not be loaded - maybe invalid?'
+        );
+
+        $arElements = $xml->xpath(
+            '//h:head/h:link'
+            . '[@rel="search" and @type="application/opensearchdescription+xml"]'
+        );
+        $this->assertEquals(
+            1, count($arElements),
+            'OpenSearch link in HTML is missing'
+        );
+        $searchDescUrl = (string)$arElements[0]['href'];
+        $this->assertNotNull($searchDescUrl, 'Search description URL is empty');
+
+        //FIXME: verify that URL exists
+        $req = new HTTP_Request2($searchDescUrl);
+        $res = $req->send();
+        $this->assertEquals(
+            200, $res->getStatus(),
+            'HTTP response status code is not 200'
+        );
+
+        $this->assertEquals(
+            $GLOBALS['unittestUrl'] . 'api/opensearch.php',
+            $searchDescUrl,
+            'OpenSearch URL found, but it is not the expected one.'
+            . ' It may be that you misconfigured the "unittestUrl" setting'
+        );
+    }
+
+}
+
+?>