Issue #3324560 by alexpott, mstrelan, dimitriskr, xjm, longwave, catch: Replace strpos/substr with str_starts_with() / str_contains() / str_ends_with()

Issue #540008 by kristiaanvandeneynde, Spokje, daffie, clayfreeman, alexpott, eelkeblok, michaelfavia, ianthomas_uk, zaporylie, johnwebdev, abhisekmazumdar, anmolgoyal74, greggles, quietone, shaal, catch, rivimey, AaronMcHale, Berdir, ndf, xjm, finne, Wim Leers, esolitos, heddn, webchick, Bojhan, andypost, efpapado, benjifisher, lauriii, Gábor Hojtsy, moshe weitzman, harings_rob: Add a container parameter that can remove the special behavior of UID#1

Issue #2575105 by Berdir, catch, longwave, quietone, kristiaanvandeneynde, andypost, alexpott, mathilde_dumond, pradhumanjain2311, amateescu, Wim Leers, xjm: Use cache collector for state

Issue #3432602 by alexpott, phenaproxima: Allow a site to be installed from configuration with no profile

Issue #3414568 by dimitriskr, smustgrave, quietone: Replace preg_match() with str_starts_with()/str_ends_with() or similar

Issue #3423329 by catch, kristiaanvandeneynde, dww, alexpott: Prevent session garbage collection during functional tests

Issue #3309104 by Bhanu951, acbramley, mondrake, ravi.shankar, smustgrave, daffie, alexpott, quietone, mstrelan: Replace REQUEST_TIME in Functional and FunctionalJavascript tests

Issue #3418236 by mstrelan, smustgrave: Fix strict type errors: Convert remaining usages of FormattableMarkup to strings in core Functional tests

Issue #3328457 by xjm, dimitriskr: Replace most substr($a, $i) where $i is negative with str_ends_with()

Issue #3328456 by xjm, dimitriskr, murilohp, smustgrave: Replace substr($a, 0, $i) with str_starts_with()

Issue #2484991 by znerol, voleger, andypost, dww, anmolgoyal74, markdorison, ankithashetty, larowlan, daffie, alexpott: Add the session to the request in KernelTestBase, BrowserTestBase, and drush

Revert "Issue #2484991 by znerol, voleger, andypost, dww, anmolgoyal74, markdorison, ankithashetty, daffie, alexpott, larowlan: Add the session to the request in KernelTestBase, BrowserTestBase, and drush"

This reverts commit 48a7cf12.

Issue #2484991 by znerol, voleger, andypost, dww, anmolgoyal74, markdorison, ankithashetty, daffie, alexpott, larowlan: Add the session to the request in KernelTestBase, BrowserTestBase, and drush

Issue #3391776 by alexpott, smustgrave, catch: InfoParser returns an empty array if passed a non-existing file

Issue #3402168 by Wim Leers, alexpott, Berdir, bircher, borisson_, effulgentsia: Follow-up for #3361534: Config validation errors can still occur for contrib modules, disrupting contrib

Issue #3165762 by znerol, Berdir, jungle, AdamPS, longwave, smustgrave, imclean, catch, dpi: Add symfony/mailer into core

Issue #3048495 by jonathan1055, quietone, rajandro, Spokje, Pooja Ganjage, andypost, kishor_kolekar, msuthars, munish.kumar, ankithashetty, ayushmishra206, ravi.shankar, naveenvalecha, longwave, Gábor Hojtsy, alexpott, smustgrave, Lendude, xjm, adityasingh, daffie: Fix Drupal.Semantics.FunctionTriggerError coding standard

Issue #3375959 by znerol, catch, bradjones1: Add a way to delay executions in test runner until terminate event completed in the child site

Issue #3256642 by mondrake, daffie, yogeshmpawar, alexpott, tmaiochi, quietone, larowlan, catch: Introduce database driver extensions and autoload database drivers' dependencies

Issue #1650930 by mkalkbrenner, gidarai, daffie, JeroenT, murilohp, jungle, acbramley, shahankitb1982, anmolgoyal74, claudiu.cristea, klausi, super_romeo, ankithashetty, longwave, pooja saraah, sahil.goyal, mikeytown2, deviantintegral, mhavelant, elgandoz, catch, andypost, pounard, neclimdul, Damien Tournoud, Charlie ChX Negyesi, danblack, larowlan: Use READ COMMITTED by default for MySQL transactions

Issue #3328454 by xjm, Bhanu951, jidrone, smustgrave: Replace most strpos() !== FALSE or === FALSE with str_contains()

Issue #3075608 by mondrake, Mile23, longwave: Introduce TestRun objects and refactor TestDatabase to be testable

Issue #3266568 by mxr576, sourabhjain, quietone: Refactor array_merge() usage in loops as possible for performance

Issue #2574981 by Manjit.Singh, dimaro, wengerk, darol100, izus, pguillard, vsujeetkumar, Himanshu5050, snehi, paulocs, rakesh.gectcr, jofitz, _utsavsharma, charginghawk, rajeshwari10, sdstyles, quietone, benjifisher, marcusvsouza, LoMo, joelpittet, justAChris, cilefen, YesCT, mradcliffe, spitzialist, annajl, jhodgdon, catch, alexpott, Sabbi0612, kattekrab, Mile23, antojose, leanderl, rodrigoac: Fix grammar ("an URL" should be "a URL") and consistent use of URL (not "url" / "Url") in documentation only

Issue #2698563 by Mile23, ankithashetty: @todo: BrowserTestBase::prepareRequestForGenerator use symfony Request

Issue #3327856 by alexpott, catch, zcht, longwave, znerol, Berdir, BramDriesen, Spokje, callen321, andypost, neclimdul, acbramley, mstrelan: Performance regression introduced by container serialization solution

Issue #3324801 by Spokje, mondrake: Fix PHPStan L2 error "Property Foo::$bar has unknown class Baz as its type."

Issue #3266688 by yassermussa, ankithashetty, Medha Kumari, pooja saraah, ravi.shankar, joachim, xjm: class docs for TestRunnerKernel are incorrect

Issue #3319683 by alexpott, mallezie, mondrake: Fix PHPStan errors from UserCreationTrait and AssertMailTrait

Issue #3309047 by mondrake: Fix 'should return {type} but return statement is missing' PHPStan L0 errors in test code