Issue #2933991 by alexpott, neclimdul: Deprecation tests fail when all PHPUnit tests are run via PHPUnit

Issue #2825487 by damiankloip, Wim Leers, garphy, cburschka, tedbow, dpovshed, tstoeckler, Munavijayalakshmi, Berdir, dawehner, e0ipso: Fix normalization of File entities: file entities should expose the file URL as a computed property on the 'uri' base field

Issue #2760167 by kim.pepper, markcarver, jibran, dawehner, znerol, Wim Leers, larowlan, xjm, tim.plunkett: Add \Drupal\Core\Messenger\Messenger

Issue #2928249 by alexpott, mondrake: Introduce a PHPUnit 6+ compatibility layer for Drupal\Tests\Listeners classes

Issue #1730874 by amateescu, e2thex, indytechcook, disasm, googletorp, hchonov, Berdir: Add support for loading multiple revisions at once

Issue #2392845 by amateescu, nuez, seanB, Alumei, penyaskito, vprocessor, steveoliver, lokapujya, tim.plunkett, yched, Sam152, Wim Leers, jibran, kristiaanvandeneynde, Berdir, larowlan, hchonov, fago: Add a trait to standardize handling of computed item lists

Issue #2870194 by alexpott, Mile23, jibran, larowlan, tim.plunkett: Ensure that process-isolated tests can use Symfony's PHPunit bridge to catch usages of deprecated code