Our test namespaces, especially in ezplatform-kernel, are loaded using autoload instead of autoload-dev which makes them being loaded also when a given package is installed as a dependency. In most cases this is not needed and clutters Composer autoloader. Tests are meant to be executed only when installed as a root package (with exception of some shared test setups - which should be reduced to a minimum).

Moreover it probably affects the size of tarballs generated during a release process by including not needed files.