Method getObjectForTrait() of class PHPUnit\Framework\TestCase is deprecated in PHPUnit 10

Let's try with an anonymous class.

I think this could be further simplified removing reflection… not sure here is the right place though.

Doing #4

It's a broader refactoring but given there's only an instance of this method used in core, I thought it can be acceptable.

MR actually extends the existing test-coverage and replaces the (as said) only occurrence of getObjectForTrait().

Committed and pushed 2dad474438 to 11.x and 74631a1331 to 10.3.x and 503f885f52 to 10.2.x. Thanks!

Backported to 10.2.x to keep tests aligned.

mondrake → closed merge request !7168

Automatically closed - issue fixed for 2 weeks with no activity.