more verbosity in test case

_test/tests/inc/httpclient_http_proxy.test.php

@@ -13,7 +13,7 @@ class httpclient_http_proxy_test extends DokuWikiTest {
         $http->proxy_port = 8080;
 
         $data = $http->get($this->url);
-        $this->assertFalse($data === false, 'HTTP response');
+        $this->assertFalse($data === false, 'HTTP response '.$http->error);
         $this->assertTrue(strpos($data,'DokuWiki') !== false, 'response content');
     }