Testing difficulty: medium (may require shell access to tweak permissions) 1. TEST: Make sure that the new "Add-on installer" admin tool is installed and available via Site administration ► Plugins ► Install add-ons. 2. Clicking the "Install add-ons from Moodle plugins directory" does not fully work yet because the server side of that feature is not implemented yet (see 4. below for work around). 3. TEST: Get some ZIP package from Moodle Plugins directory (download them manually to your computer) and try to install it via the new tool. 4. TEST: To test the "remote" installation mode, we need to mimic the redirection from Moodle Plugins repository back to our machine. You can use the following script to generate a request that simulates what Moodle plugins directory will do: <?php   $moodleurl = 'http://localhost/moodle25'; // Replace with your 2.5dev URL   $request = base64_encode(json_encode(array( 'name' => 'Stamp collection', 'component' => 'mod_stampcoll', 'version' => 2012062201, )));   echo $moodleurl.'/admin/index.php?installaddonrequest='.rawurlencode($request).PHP_EOL; The script will generate URL like: http://localhost/moodle25/admin/index.php?installaddonrequest=eyJuYW1lIjoiU3RhbXAgY29sbGVjdGlvbiIsImNvbXBvbmVudCI6Im1vZF9zdGFtcGNvbGwiLCJ2ZXJzaW9uIjoyMDEyMDYyMjAxfQ%3D%3D that should lead to installing the described add-on version.