Update testing.rst

Author: nayzo

book/testing.rst

@@ -492,6 +492,11 @@ If you want the client to automatically follow all redirects, you can
 force him with the ``followRedirects()`` method::
 
     $client->followRedirects();
+    
+Also if you want to prevent the client from following any redirect, you can
+force him by adding false as parameter to ``followRedirects()`` method::
+
+    $client->followRedirects(false);
 
 .. index::
    single: Tests; Crawler