Phpunit 9

[Jean85]

This is still WIP, it doesn't work for now.

Due to some deprecations, I'm forced to change approach in how Paraunit collects the test results. This new approach uses the TestHook interfaces, which are cross-compatible from PHPUnit 7 up to 9, but those will be injectable through CLI only from PHPUnit 9.1 thanks to sebastianbergmann/phpunit#4136. This will mean that this PR will lead to a 1.1 release dropping PHPUnit < 9.1 support.

It will lead to a cleaner approach, but it requires a good overhaul of the Paraunit internals.

[sebastianbergmann]

With regards to test hooks: these will be superseded by the new event system @theseer, @localheinz, @epdenouden are working on (see theseer/phpunit#1). This will hopefully be merged soon in time for PHPUnit 9.1 (or PHPUnit 9.2).

Test listeners were problematic, got deprecated, but so far have not been removed. Hooks were a lot better than listeners already, but still left a lot to be desired. Hooks will be deprecated when the event system is merged. Everything inside PHPUnit that currently still uses listeners will be refactored to use events. Then, hopefully in PHPUnit 10, both listeners and hooks will be removed.

[Jean85]

Thanks for the heads up @sebastianbergmann! I'll look into it!

[sebastianbergmann]

You're welcome. Any feedback, especially on missing events, would be appreciated.

[Jean85]

Opened theseer/phpunit#2 on the new approach; it seems incomplete for now, but I can proceed with using TestHooks and reconvert them easily to event subscribers as soon as that approach lands into PHPUnit.