Testing suggestion to use PHPUnit phar should be changed from 3.3 on

[YetiCGN]

The testing page mentions "It's recommended to use the latest stable PHPUnit version, installed as PHAR."

However, this causes issues with the new 3.3 Yaml component and PHPUnit's bundled version in the PHAR, effectively failing every test and very weird to debug.

The current recommendation to work around this issue is to "do a Composer + require-dev + phpunit/phpunit and execute your tests via ./vendor/bin/phpunit". I think this should somehow be mentioned here to prevent others from searching in vain.

[xabbuh]

I think we should explain how to use the simple-phpunit script from the PhpUnitBridge instead.

[YetiCGN]

Or that.

[HeahDude]

Agreed with @xabbuh.

[javiereguiluz]

Fixed by #9213.