| AccessDeniedTest | core/modules/system/tests/src/Functional/System/AccessDeniedTest.php | Tests page access denied functionality, including custom 403 pages. | 
          
                  | AdminMetaTagTest | core/modules/system/tests/src/Functional/System/AdminMetaTagTest.php | Confirm that the fingerprinting meta tag appears as expected. | 
          
                  | AdminTest | core/modules/system/tests/src/Functional/System/AdminTest.php | Tests output on administrative pages and compact mode functionality. | 
          
                  | CronRunTest | core/modules/system/tests/src/Functional/System/CronRunTest.php | Tests cron runs. | 
          
                  | DatabaseDriverProvidedByModuleTest | core/modules/system/tests/src/Functional/System/DatabaseDriverProvidedByModuleTest.php | Tests output on the status overview page. | 
          
                  | DateFormatsLockedTest | core/modules/system/tests/src/Functional/System/DateFormatsLockedTest.php | Tests the locked functionality of date formats. | 
          
                  | DateFormatsMachineNameTest | core/modules/system/tests/src/Functional/System/DateFormatsMachineNameTest.php | Tests validity of date format machine names. | 
          
                  | DateTimeTest | core/modules/system/tests/src/Functional/System/DateTimeTest.php | Configure date and time settings. Test date formatting and time zone
handling, including daylight saving time. | 
          
                  | DefaultMobileMetaTagsTest | core/modules/system/tests/src/Functional/System/DefaultMobileMetaTagsTest.php | Confirm that the default mobile meta tags appear as expected. | 
          
                  | ErrorHandlerTest | core/modules/system/tests/src/Functional/System/ErrorHandlerTest.php | Performs tests on the Drupal error and exception handler. | 
          
                  | FrontPageTest | core/modules/system/tests/src/Functional/System/FrontPageTest.php | Tests front page functionality and administration. | 
          
                  | HtaccessTest | core/modules/system/tests/src/Functional/System/HtaccessTest.php | Tests .htaccess is working correctly. | 
          
                  | IndexPhpTest | core/modules/system/tests/src/Functional/System/IndexPhpTest.php | Tests the handling of requests containing 'index.php'. | 
          
                  | MainContentFallbackTest | core/modules/system/tests/src/Functional/System/MainContentFallbackTest.php | Test SimplePageVariant main content rendering fallback page display variant. | 
          
                  | PageNotFoundTest | core/modules/system/tests/src/Functional/System/PageNotFoundTest.php | Tests page not found functionality, including custom 404 pages. | 
          
                  | PageTitleTest | core/modules/system/tests/src/Functional/System/PageTitleTest.php | Tests HTML output escaping of page title, site name, and slogan. | 
          
                  | ResponseGeneratorTest | core/modules/system/tests/src/Functional/System/ResponseGeneratorTest.php | Tests to see if generator header is added. | 
          
                  | RetrieveFileTest | core/modules/system/tests/src/Functional/System/RetrieveFileTest.php | Tests HTTP file fetching and error handling. | 
          
                  | ShutdownFunctionsTest | core/modules/system/tests/src/Functional/System/ShutdownFunctionsTest.php | Functional tests shutdown functions. | 
          
                  | SiteMaintenanceTest | core/modules/system/tests/src/Functional/System/SiteMaintenanceTest.php | Tests access to site while in maintenance mode. | 
          
                  | SitesDirectoryHardeningTest | core/modules/system/tests/src/Functional/System/SitesDirectoryHardeningTest.php | Tests Drupal permissions hardening of /sites subdirectories. | 
          
                  | StatusTest | core/modules/system/tests/src/Functional/System/StatusTest.php | Tests output on the status overview page. | 
          
                  | SystemAuthorizeTest | core/modules/system/tests/src/Functional/System/SystemAuthorizeTest.php | Tests the authorize.php script and related API. | 
          
                  | ThemeTest | core/modules/system/tests/src/Functional/System/ThemeTest.php | Tests the theme interface functionality by enabling and switching themes, and
using an administration theme. | 
          
                  | TokenReplaceWebTest | core/modules/system/tests/src/Functional/System/TokenReplaceWebTest.php | Tests the token system integration. | 
          
                  | TokenScanTest | core/modules/system/tests/src/Functional/System/TokenScanTest.php | Scan token-like patterns in a dummy text to check token scanning. | 
          
                  | TrustedHostsTest | core/modules/system/tests/src/Functional/System/TrustedHostsTest.php | Tests output on the status overview page. |