use correct host in proxy tests

_test/tests/inc/httpclient_https_proxy.test.php

@@ -2,7 +2,7 @@
 require_once dirname(__FILE__).'/httpclient_http_proxy.test.php';
 
 class httpclient_https_proxy_test extends httpclient_http_proxy_test {
-    protected $url = 'https://www.dokuwiki.org/README';
+    protected $url = 'https://test.dokuwiki.org/README';
 
     public function setUp(){
         // skip tests when this PHP has no SSL support
@@ -27,4 +27,4 @@ class httpclient_https_proxy_test extends httpclient_http_proxy_test {
         $this->assertFalse($data);
         $this->assertEquals(-150, $http->status);
     }
-}
\ No newline at end of file
+}