system.theme.yml

AjaxTest::testAjaxWithAdminRoute in core/tests/Drupal/FunctionalJavascriptTests/Ajax/AjaxTest.php

AjaxTest::testUiAjaxException in core/tests/Drupal/FunctionalJavascriptTests/Ajax/AjaxTest.php

Tests that Ajax errors are visible in the UI.

BlockContentTypeTest::testsBlockContentAddTypes in core/modules/block_content/tests/src/Functional/BlockContentTypeTest.php

Tests that redirects work as expected when multiple block types exist.

BlockDemoTest::testBlockDemo in core/modules/block/tests/src/Functional/BlockDemoTest.php

Check for the accessibility of the admin block demo page.

BlockTest::testBlockThemeSelector in core/modules/block/tests/src/Functional/BlockTest.php

Tests that the block form has a theme selector when not passed via the URL.

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