Issue #2456477 by Berdir, dawehner, heddn, pguillard: Convert deprecated \Drupal\simpletest\KernelTestBase tests to KernelTestBaseNG

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

Issue #2549921 by borisson_, alexpott: SearchExcerptTest and SearchMatchTest should be a KernelTestBase tests

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

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

Issue #1842226 by jhodgdon | spartlow: Fixed Search OR statements don't work if same keyword is used.

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

Issue #2246665 by jaredsmith, martin107, YesCT, filijonka, tstoeckler: Typehint with Drupal\Core\Language\LanguageInterface instead Drupal\Core\Language\Language.

Issue #1620010 by dawehner, ParisLiakos, plach, jibran: Move LANGUAGE constants to the Language class.

Issue #1669876 by balintk, Gábor Hojtsy, brantwynn, Berdir: Add missing language functionality in search module.

Issue #1496510 by swentel, jvns, cosmicdreams, marcingy, alexpott, heyrocker, sun: Convert search settings to configuration system.