Issue #2257427 by sun: Run-tests.sh builds + rebuilds two kernels from scratch for every PHP process.

Issue #340723 by ParisLiakos, sun, Berdir, glennpratt, Cottser, swentel, alexpott, tstoeckler, Xano, tim.plunkett, BassistJimmyJam | beejeebus: Make modules and installation profiles only require .info.yml files.

Issue #2171683 by sun, alexpott, tstoeckler, larowlan: Remove all Simpletest overrides and rely on native multi-site functionality instead.

Revert "Issue #2171683 by sun, tstoeckler, larowlan: Remove all Simpletest overrides and rely on native multi-site functionality instead."

This reverts commit 91db25eb. Broke web
tests.

Issue #2171683 by sun, tstoeckler, larowlan: Remove all Simpletest overrides and rely on native multi-site functionality instead.

Issue #2167109 by Berdir, sun, alexpott, ACF, acrollet, adamdicarlo, Albert Volkman, andreiashu, andyceo, andypost, anenkov, aspilicious, barbun, beejeebus, boombatower, cam8001, chriscalip, chx, cosmicdreams, dagmar, damiankloip, dawehner, deviance, disasm, dixon_, dstol, ebrowet, Gábor Hojtsy, heyrocker, Hydra, ianthomas_uk, japicoder, jcisio, jibran, julien, justafish, jvns, KarenS, kbasarab, kim.pepper, larowlan, Lars Toomre, leschekfm, Letharion, LinL, lirantal, Lukas von Blarer, marcingy, Mike Wacker, mrf, mtift, mtunay, n3or, nadavoid, nick_schuch, Niklas Fiekas, ParisLiakos, pcambra, penyaskito, pfrenssen, plopesc, Pol, Rok Žlender, rvilar, swentel, tim.plunkett, tobiasb, tsvenson, typhonius, vasi1186, vijaycs85, wamilton, webchick, webflo, wizonesolutions, xjm, yched, YesCT, znerol: Remove Variable subsystem.

Issue #2150623 by dawehner, pwolanin, rfay: Subdirectory + Clean URLs failure: 6.x-3.x PIFR: 3 Failures in D8 test.

Issue #2149977 by JStanton: Run-tests.sh no longer respects specifying a port with the --url option.

Issue #2004086 by dawehner, pwolanin, katbailey, tim.plunkett, vijaycs85, fabpot: The Request service must be synthetic.

Issue #2129197 by dawehner: Testbot (run-tests.sh with --file) attempts to run non-test classes, fails.

Issue #2114727 by ianthomas_uk: Added Improve error message when using run-tests.sh with Testing module disabled.

Issue #2045931 by PerthSam152, LinL, adsw12, joelpittet: Replace all module_exists() deprecated function calls.

This reverts commit cc84f390 - bad
commit message.

Issue #2038135 by RobLoach, donquixote, Crell, ParisLiakos, catch: Use the Composer autoloader to make everything simpler.

Issue #1856766 by chx, Berdir, heyrocker, kim.pepper: Convert file_public_path() to the new settings system (make it not configurable via UI or YAML).

Issue #1888424 by katbailey, steveoliver, twistor, beejeebus, effulgentsia: Change notice: Make Drupal's URL generation logic available to HttpKernel, and minimize code repetition/divergence.

Issue #1991088 by alexpott: Fixed Test info not displayed for PHPUnit tests when using run-tests.sh.

This reverts commit 13b929b6.

Issue #1825592 follow-up by sun, alexpott: Clean-ups to --repeat and --die-on-fail capabilities in run-tests.sh.

Issue #1825592 by alexpott: Add --repeat and --die-on-fail to run-tests.sh to make random test failure diagnosis easier.

Issue #347988 by sun, Berdir, dawehner, Damien Tournoud, moshe weitzman: Move $user->data into own table.

Issue #1808200 by sun: Fixed Unit test performance significantly decreased since system list config conversion.

Issue #1706064 by chx, katbailey, effulgentsia, podarok et al: Compile the Injection Container to disk.

Issue #1705748 by n3or, tim.plunkett, sun, xjm, boombatower: Convert simpletest settings to configuration system.

Issue #1719530 follow-up by sun: SimpleTest hasn't been converted to CMI yet; add a stop-gap rename in conf array.