This is intentional, for older PHP support. See #45934. git-svn-id: https://develop.svn.wordpress.org/trunk@44560 602fd350-edb4-49c9-b593-d223f7449a82
WP_TESTS_SKIP_INSTALL
WP_Block_Type
WP_Block_Type_Registry
$merged_filters
WP_UnitTestCase
E_WARNING