Issue #2742585 by ZeiP, alexpott, mondrake, klausi, tomasnagy, Krzysztof Domański, sokru, kristiaanvandeneynde, dawehner, jeroenbegyn: Deprecate dangerous assertTrue/False() compatibility overrides in PHPUnit Kernel, Functional and FunctionalJavascript tests

Issue #2839844 by chaitanya17, tomasnagy: Notice: Undefined index: package in system_requirements() (line 60 of core\modules\system\system.install).