Summary (*)

Magento 2.3 or 2.4. There are a lot of tests inside dev/tests directory, which violates modularity of platform, because while uninstalling (I mean completely removing) package from vendor tests stays in dev/tests. Wouldn't be better to spread them across corresponding modules? What if, I would like to uninstall module Magento_Wishlist and still run all integration tests? I still will have its tests in dev/tests/integration/testsuite/Magento/Wishlist, which won't work if I remove composer package with physical code.

Examples (*)

Test inside dev/tests/integration/testsuite/Magento/*.

Proposed solution

Copy-paste modules tests - I could start with integration ones into corresponding modules, so testsuite is decoupled from fixed modules set.