Issue #2719695 by alexpott, Mile23: Fix 'Drupal.Classes.ClassDeclaration.CloseBraceAfterBody' coding standard

Issue #2701851 by amateescu, animaci: The 'system.db_update' route should restrict access via the 'access_check.db_update' service

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2616164 by agoradesign, swentel, facine, dawehner: /update.php/run URL is generated with language prefix and returns 404 error

Issue #2538274 by pwolanin, Wim Leers, dawehner: DbUpdateController has broken mainteneance mode logic, and update.php doesn't run due to aggregated JS assets

Issue #1392754 by tss, justAChris, jhodgdon: Comply with new documentation standards for @file for namespaced class files

Issue #2074297 by pwolanin, hussainweb, larowlan: Optimize the code in doGenerate() in the UrlGenerator to take advantage of Drupal path restrictions.

Issue #2389455 by hussainweb, AjitS, Mile23, subhojit777, tibbsa, Ayesh: Clean-up system module test members - ensure property definition and use of camelCase naming convention

Issue #2382195 by tibbsa, subhojit777, tadityar, cilefen, Mile23: Clean-up simpletest module test members - ensure property definition and use of camelCase naming convention

Issue #2395395 by alexpott, effulgentsia, Gábor Hojtsy: TestBase lacks a config method to be used consistently in tests

Issue #597236 by Berdir, catch, msonnabaum, Xano, Wim Leers, jhedstrom, amateescu, corvus_ch, swentel, moshe weitzman, Gábor Hojtsy, riccardoR, killes@www.drop.org, et al: Add entity caching to core.

Issue #697760 by sun: Replace getInfo() in tests with native phpDoc + annotations (following PHPUnit).

Issue #2228921 by sun: Consolidate system.module + system.theme + system.theme.disabled into core.extension config.

Issue #2168011 by xjm, jessebeach, Damien Tournoud, znerol, Xano: Remove all 7.x to 8.x update hooks and disallow updates from the previous major version.

Issue #2014017 by jlbellido, alvar0hurtad0, undertext, benjy, penyaskito, LinL: Replace drupal_container() with Drupal::service() in the system module.

Issue #2074037 by Wim Leers, effulgentsia: Add drupalPostUrl() — drupalPost()/drupalPostAjax() are for forms only, D8 JS performs non-form HTTP requests.

Issue #2017769 by pplantinga, clemens.tolboom, elachlan, katbailey, longwave: Fixed Links from update_helpful_links() should point to site root and not to update.php.

Issue #1984766 by sdboyer, Niklas Fiekas, msonnabaum: Fixed Start relying on Request/Response objects for cache handling.

Issue #1431658 by Albert Volkman, kid_icarus, ChinggizKhan, xjm, rgristroph, connork: Clean up API docs for many system tests

Issue #1608842 by chx, alexpott, sun, effulgentsia, beejeebus, tim.plunkett et al: Replace list of bootstrap modules, enabled modules, enabled themes, and default theme with config.

Issue #1711070 by kid_icarus, tim.plunkett, xjm, droplet, zendoodles and cam8001: Convert tests to use ::$modules property instead of parent::setUp($modules).