Issue #3271507 by danflanagan8, nod_: Block tests should not rely on Classy

core/modules/block/tests/src/Functional/BlockCacheTest.php

core/modules/block/tests/src/Functional/BlockDemoTest.php

...dules/block/tests/src/Functional/BlockFormInBlockTest.php

...ules/block/tests/src/Functional/BlockHiddenRegionTest.php

core/modules/block/tests/src/Functional/BlockHtmlTest.php

...les/block/tests/src/Functional/BlockInvalidRegionTest.php

...es/block/tests/src/Functional/BlockSystemBrandingTest.php

core/modules/block/tests/src/Functional/BlockTest.php

core/modules/block/tests/src/Functional/BlockUiTest.php

core/modules/block/tests/src/Functional/BlockXssTest.php

...les/block/tests/src/Functional/Rest/BlockJsonAnonTest.php

...lock/tests/src/Functional/Rest/BlockJsonBasicAuthTest.php

...s/block/tests/src/Functional/Rest/BlockJsonCookieTest.php

...block/tests/src/Functional/Rest/BlockResourceTestBase.php

...ules/block/tests/src/Functional/Rest/BlockXmlAnonTest.php

...block/tests/src/Functional/Rest/BlockXmlBasicAuthTest.php

...es/block/tests/src/Functional/Rest/BlockXmlCookieTest.php

...les/block/tests/src/Functional/Views/DisplayBlockTest.php

.../modules/block/tests/src/Kernel/BlockConfigSchemaTest.php

core/modules/block/tests/src/Kernel/BlockRebuildTest.php