How to cover system class with Binding.php?

[krzysztof.czereczon]

I need to move from fork of euroeko to plugin patter. I've made some major changes in Phone logic, like adding additional flags.
Now I need some way to cover original class with my own class.

$binder->bindImplementation(
\Espo\Core\Utils\Database\Orm\FieldConverters\Phon e::class,
\Espo\Modules\Custom\Utils\Database\Orm\FieldConve rters\Phone::class
);

I need to cover more of those classes.