JSON schema validation Connect to https://www.jsonschemavalidator.net In the "Select schema" box (left), copy the contents of the lib/apis.schema.json file. In the "Input JSON" box (right), copy the contents of the lib/apis.json file. Verify that you get a green text with message: "√ No errors found. JSON validates against the schema" Normal tests Install a MOODLE_311_STABLE site and create a course in the site. Verify that the file core_component.php has been created under the "site dataroot/cache" directory. Annotate its size and date. Verify that it contains both the 'subsystems' array and the 'plugins' array. (quotes includes in the search) Verify that it does not contain the 'apis' array. (quotes includes in the search) Switch to the master branch and upgrade, via web, the site to it (4.1dev). Verify that there isn't any notice/warning/error shown along the upgrade process related with the core_component.php file. Verify that the file core_component.php exists in the "site dataroot/cache" directory. Annotate its size and date. Verify that the size is now bigger (~100Kb) and the date has been updated. Verify that it contains both the 'subsystems' array and the 'plugins' array. (quotes includes in the search) Verify that, now, it also contain the 'apis' array (quotes includes in the search), with 'access' being the first element. Wait 1 minute (yes, 60 seconds). Delete the core_component.php file. Visit the site main page. Verify the the core_component.php file has been created again. Annotate its size and date. Verify that the size is the same than the 2nd annotation and the date has been updated. Verify that it contain the 'apis' array (quotes includes in the search) with 'access' being the first element. Tests using alternative component cache. Install a MOODLE_400_SITE with this setting added to your config.php file: $CFG->alternative_component_cache = $CFG->dataroot . '/mdl71096_cache.php'; Verify that the file mdl71096_cache.php has been created under the "site dataroot" directory. Annotate its size and date. Verify that it does not contain the 'apis' array. (quotes includes in the search) Switch to the master branch and visit http://your.site.url/my Depending of your debugging settings you may see some PHP Warning about "Undefined array key "apis"". That's ok. Also if you don't see them. Verify that you are redirected to http://your.site.url/admin/index.php and there, you see the error: " Outdated component cache file defined in $CFG->alternative_component_cache, can not continue " In the terminal, in the "moodle root directory" execute sudo php admin/cli/alternative_component_cache.php --rebuild Verify that the file mdl71096_cache.php under the "site dataroot" directory continues existing. Annotate its size and date. Verify that the size is now bigger (~100Kb) and the date has been updated. Verify that, now, it also contain the 'apis' array (quotes includes in the search), with 'access' being the first element. Reload the page ( http://your.site.url/admin/index.php ) in the browser. Verify that now it's possible to continue with the upgrade. Complete the upgrade. Wait 1 minute (yes, 60 seconds). Delete the mdl71096_cache.php file Visit the site main page. Verify the the mdl71096_cache.php file has been created again. Annotate its size and date. Verify that the size is the same than the 2nd annotation and the date has been updated. Verify that it contain the 'apis' array (quotes includes in the search), with 'access' being the first element.